[MNG-4756] Aether integration

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-3/trunk@988749 13f79535-47bb-0310-9956-ffa450edef68

apache-maven/NOTICE.txt

@@ -13,7 +13,7 @@ The Apache Software Foundation (http://www.apache.org/).
 This product includes software (Plexus and Classworlds) developed by
 The Codehaus Foundation (http://www.codehaus.org/).
 
-This product includes software (Spice, Plexus Ciper and Sec Dispatcher) developed by
+This product includes software (Aether, Spice, Plexus Ciper and Sec Dispatcher) developed by
 Sonatype Inc. (http://www.sonatype.org/).
 
 This product includes software (NekoHTML) developed by

apache-maven/pom.xml

@@ -59,6 +59,10 @@
       <groupId>org.apache.maven.wagon</groupId>
       <artifactId>wagon-file</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-connector-wagon</artifactId>
+    </dependency>
   </dependencies>
 
   <build>

build.xml

@@ -195,7 +195,7 @@ Do you want to continue?</input>
     <modello file="maven-model-builder/src/main/mdo/profiles.mdo" />
     <modello file="maven-settings/src/main/mdo/settings.mdo" version="1.1.0" />
     <modello file="maven-core/src/main/mdo/toolchains.mdo" />
-    <modello file="maven-repository-metadata/src/main/mdo/metadata.mdo" />
+    <modello file="maven-repository-metadata/src/main/mdo/metadata.mdo" version="1.1.0" />
     <modello file="maven-compat/src/main/mdo/profiles.mdo" />
     <modello file="maven-compat/src/main/mdo/paramdoc.mdo" />
   </target>

maven-aether-provider/pom.xml

@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.maven</groupId>
+    <artifactId>maven</artifactId>
+    <version>3.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>maven-aether-provider</artifactId>
+
+  <name>Maven Aether Provider</name>
+  <description>
+    This module provides extensions to Aether for utilizing the Maven POM and Maven metadata.
+  </description>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-model-builder</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-repository-metadata</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-util</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-impl</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-component-annotations</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-component-metadata</artifactId>
+      </plugin>
+    </plugins>
+  </build>
+
+</project>

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultArtifactDescriptorReader.java

@@ -0,0 +1,449 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+import org.apache.maven.model.DependencyManagement;
+import org.apache.maven.model.DistributionManagement;
+import org.apache.maven.model.License;
+import org.apache.maven.model.Model;
+import org.apache.maven.model.Relocation;
+import org.apache.maven.model.Repository;
+import org.apache.maven.model.building.DefaultModelBuilderFactory;
+import org.apache.maven.model.building.DefaultModelBuildingRequest;
+import org.apache.maven.model.building.FileModelSource;
+import org.apache.maven.model.building.ModelBuilder;
+import org.apache.maven.model.building.ModelBuildingException;
+import org.apache.maven.model.building.ModelBuildingRequest;
+import org.apache.maven.model.building.ModelProblem;
+import org.apache.maven.model.resolution.UnresolvableModelException;
+import org.codehaus.plexus.component.annotations.Component;
+import org.codehaus.plexus.component.annotations.Requirement;
+import org.sonatype.aether.RepositoryException;
+import org.sonatype.aether.RepositoryListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.artifact.ArtifactType;
+import org.sonatype.aether.artifact.ArtifactTypeRegistry;
+import org.sonatype.aether.graph.Dependency;
+import org.sonatype.aether.graph.Exclusion;
+import org.sonatype.aether.impl.ArtifactDescriptorReader;
+import org.sonatype.aether.impl.ArtifactResolver;
+import org.sonatype.aether.impl.RemoteRepositoryManager;
+import org.sonatype.aether.impl.VersionResolver;
+import org.sonatype.aether.transfer.ArtifactNotFoundException;
+import org.sonatype.aether.util.artifact.ArtifactProperties;
+import org.sonatype.aether.util.artifact.DefaultArtifact;
+import org.sonatype.aether.util.artifact.DefaultArtifactType;
+import org.sonatype.aether.util.artifact.SubArtifact;
+import org.sonatype.aether.util.listener.DefaultRepositoryEvent;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.RepositoryPolicy;
+import org.sonatype.aether.repository.WorkspaceRepository;
+import org.sonatype.aether.resolution.ArtifactDescriptorException;
+import org.sonatype.aether.resolution.ArtifactDescriptorRequest;
+import org.sonatype.aether.resolution.ArtifactDescriptorResult;
+import org.sonatype.aether.resolution.ArtifactRequest;
+import org.sonatype.aether.resolution.ArtifactResolutionException;
+import org.sonatype.aether.resolution.ArtifactResult;
+import org.sonatype.aether.resolution.VersionRequest;
+import org.sonatype.aether.resolution.VersionResolutionException;
+import org.sonatype.aether.spi.locator.Service;
+import org.sonatype.aether.spi.locator.ServiceLocator;
+import org.sonatype.aether.spi.log.Logger;
+import org.sonatype.aether.spi.log.NullLogger;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = ArtifactDescriptorReader.class )
+public class DefaultArtifactDescriptorReader
+    implements ArtifactDescriptorReader, Service
+{
+
+    @Requirement
+    private Logger logger = NullLogger.INSTANCE;
+
+    @Requirement
+    private RemoteRepositoryManager remoteRepositoryManager;
+
+    @Requirement
+    private VersionResolver versionResolver;
+
+    @Requirement
+    private ArtifactResolver artifactResolver;
+
+    @Requirement
+    private ModelBuilder modelBuilder;
+
+    public void initService( ServiceLocator locator )
+    {
+        setLogger( locator.getService( Logger.class ) );
+        setRemoteRepositoryManager( locator.getService( RemoteRepositoryManager.class ) );
+        setVersionResolver( locator.getService( VersionResolver.class ) );
+        setArtifactResolver( locator.getService( ArtifactResolver.class ) );
+        modelBuilder = locator.getService( ModelBuilder.class );
+        if ( modelBuilder == null )
+        {
+            setModelBuilder( new DefaultModelBuilderFactory().newInstance() );
+        }
+    }
+
+    public DefaultArtifactDescriptorReader setLogger( Logger logger )
+    {
+        this.logger = ( logger != null ) ? logger : NullLogger.INSTANCE;
+        return this;
+    }
+
+    public DefaultArtifactDescriptorReader setRemoteRepositoryManager( RemoteRepositoryManager remoteRepositoryManager )
+    {
+        if ( remoteRepositoryManager == null )
+        {
+            throw new IllegalArgumentException( "remote repository manager has not been specified" );
+        }
+        this.remoteRepositoryManager = remoteRepositoryManager;
+        return this;
+    }
+
+    public DefaultArtifactDescriptorReader setVersionResolver( VersionResolver versionResolver )
+    {
+        if ( versionResolver == null )
+        {
+            throw new IllegalArgumentException( "version resolver has not been specified" );
+        }
+        this.versionResolver = versionResolver;
+        return this;
+    }
+
+    public DefaultArtifactDescriptorReader setArtifactResolver( ArtifactResolver artifactResolver )
+    {
+        if ( artifactResolver == null )
+        {
+            throw new IllegalArgumentException( "artifact resolver has not been specified" );
+        }
+        this.artifactResolver = artifactResolver;
+        return this;
+    }
+
+    public DefaultArtifactDescriptorReader setModelBuilder( ModelBuilder modelBuilder )
+    {
+        if ( modelBuilder == null )
+        {
+            throw new IllegalArgumentException( "model builder has not been specified" );
+        }
+        this.modelBuilder = modelBuilder;
+        return this;
+    }
+
+    public ArtifactDescriptorResult readArtifactDescriptor( RepositorySystemSession session,
+                                                            ArtifactDescriptorRequest request )
+        throws ArtifactDescriptorException
+    {
+        ArtifactDescriptorResult result = new ArtifactDescriptorResult( request );
+
+        Model model = loadPom( session, request, result );
+
+        if ( model != null )
+        {
+            ArtifactTypeRegistry stereotypes = session.getArtifactTypeRegistry();
+
+            for ( Repository r : model.getRepositories() )
+            {
+                result.addRepository( convert( r ) );
+            }
+
+            for ( org.apache.maven.model.Dependency dependency : model.getDependencies() )
+            {
+                result.addDependency( convert( dependency, stereotypes ) );
+            }
+
+            DependencyManagement mngt = model.getDependencyManagement();
+            if ( mngt != null )
+            {
+                for ( org.apache.maven.model.Dependency dependency : mngt.getDependencies() )
+                {
+                    result.addManagedDependency( convert( dependency, stereotypes ) );
+                }
+            }
+
+            Map<String, Object> properties = new LinkedHashMap<String, Object>();
+
+            List<License> licenses = model.getLicenses();
+            properties.put( "license.count", Integer.valueOf( licenses.size() ) );
+            for ( int i = 0; i < licenses.size(); i++ )
+            {
+                License license = licenses.get( i );
+                properties.put( "license." + i + ".name", license.getName() );
+                properties.put( "license." + i + ".url", license.getUrl() );
+                properties.put( "license." + i + ".comments", license.getComments() );
+                properties.put( "license." + i + ".distribution", license.getDistribution() );
+            }
+
+            result.setProperties( properties );
+        }
+
+        return result;
+    }
+
+    private Model loadPom( RepositorySystemSession session, ArtifactDescriptorRequest request,
+                           ArtifactDescriptorResult result )
+        throws ArtifactDescriptorException
+    {
+        Set<String> visited = new LinkedHashSet<String>();
+        for ( Artifact artifact = request.getArtifact();; )
+        {
+            try
+            {
+                VersionRequest versionRequest =
+                    new VersionRequest( artifact, request.getRepositories(), request.getRequestContext() );
+                versionResolver.resolveVersion( session, versionRequest );
+            }
+            catch ( VersionResolutionException e )
+            {
+                result.addException( e );
+                throw new ArtifactDescriptorException( result );
+            }
+
+            if ( !visited.add( artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion() ) )
+            {
+                RepositoryException exception =
+                    new RepositoryException( "Artifact relocations form a cycle: " + visited );
+                invalidDescriptor( session, artifact, exception );
+                if ( session.isIgnoreInvalidArtifactDescriptor() )
+                {
+                    return null;
+                }
+                result.addException( exception );
+                throw new ArtifactDescriptorException( result );
+            }
+
+            Artifact pomArtifact = artifact;
+            if ( pomArtifact.getClassifier().length() > 0 || !"pom".equals( pomArtifact.getExtension() ) )
+            {
+                pomArtifact = new SubArtifact( artifact, "", "pom" );
+            }
+
+            ArtifactResult resolveResult;
+            try
+            {
+                ArtifactRequest resolveRequest =
+                    new ArtifactRequest( pomArtifact, request.getRepositories(), request.getRequestContext() );
+                resolveResult = artifactResolver.resolveArtifact( session, resolveRequest );
+                pomArtifact = resolveResult.getArtifact();
+                result.setRepository( resolveResult.getRepository() );
+            }
+            catch ( ArtifactResolutionException e )
+            {
+                if ( e.getCause() instanceof ArtifactNotFoundException )
+                {
+                    missingDescriptor( session, artifact );
+                    if ( session.isIgnoreMissingArtifactDescriptor() )
+                    {
+                        return null;
+                    }
+                }
+                result.addException( e );
+                throw new ArtifactDescriptorException( result );
+            }
+
+            Model model;
+            try
+            {
+                ModelBuildingRequest modelRequest = new DefaultModelBuildingRequest();
+                modelRequest.setValidationLevel( ModelBuildingRequest.VALIDATION_LEVEL_MINIMAL );
+                modelRequest.setProcessPlugins( false );
+                modelRequest.setTwoPhaseBuilding( false );
+                modelRequest.setSystemProperties( toProperties( session.getSystemProperties() ) );
+                modelRequest.setUserProperties( toProperties( session.getUserProperties() ) );
+                modelRequest.setModelCache( DefaultModelCache.newInstance( session ) );
+                modelRequest.setModelResolver( new DefaultModelResolver( session, request.getRequestContext(),
+                                                                         artifactResolver, remoteRepositoryManager,
+                                                                         request.getRepositories() ) );
+                if ( resolveResult.getRepository() instanceof WorkspaceRepository )
+                {
+                    modelRequest.setPomFile( pomArtifact.getFile() );
+                }
+                else
+                {
+                    modelRequest.setModelSource( new FileModelSource( pomArtifact.getFile() ) );
+                }
+
+                model = modelBuilder.build( modelRequest ).getEffectiveModel();
+            }
+            catch ( ModelBuildingException e )
+            {
+                for ( ModelProblem problem : e.getProblems() )
+                {
+                    if ( problem.getException() instanceof UnresolvableModelException )
+                    {
+                        result.addException( problem.getException() );
+                        throw new ArtifactDescriptorException( result );
+                    }
+                }
+                invalidDescriptor( session, artifact, e );
+                if ( session.isIgnoreInvalidArtifactDescriptor() )
+                {
+                    return null;
+                }
+                result.addException( e );
+                throw new ArtifactDescriptorException( result );
+            }
+
+            Relocation relocation = getRelocation( model );
+
+            if ( relocation != null )
+            {
+                result.addRelocation( artifact );
+                artifact =
+                    new RelocatedArtifact( artifact, relocation.getGroupId(), relocation.getArtifactId(),
+                                           relocation.getVersion() );
+                result.setArtifact( artifact );
+            }
+            else
+            {
+                return model;
+            }
+        }
+    }
+
+    private Properties toProperties( Map<String, String> map )
+    {
+        Properties props = new Properties();
+        if ( map != null )
+        {
+            props.putAll( map );
+        }
+        return props;
+    }
+
+    private Relocation getRelocation( Model model )
+    {
+        Relocation relocation = null;
+        DistributionManagement distMngt = model.getDistributionManagement();
+        if ( distMngt != null )
+        {
+            relocation = distMngt.getRelocation();
+        }
+        return relocation;
+    }
+
+    private Dependency convert( org.apache.maven.model.Dependency dependency, ArtifactTypeRegistry stereotypes )
+    {
+        ArtifactType stereotype = stereotypes.get( dependency.getType() );
+        if ( stereotype == null )
+        {
+            stereotype = new DefaultArtifactType( dependency.getType() );
+        }
+
+        boolean system = dependency.getSystemPath() != null && dependency.getSystemPath().length() > 0;
+
+        Map<String, String> props = null;
+        if ( system )
+        {
+            props = Collections.singletonMap( ArtifactProperties.LACKS_DESCRIPTOR, Boolean.TRUE.toString() );
+        }
+
+        Artifact artifact =
+            new DefaultArtifact( dependency.getGroupId(), dependency.getArtifactId(), dependency.getClassifier(), null,
+                                 dependency.getVersion(), props, stereotype );
+
+        if ( system )
+        {
+            artifact = artifact.setFile( new File( dependency.getSystemPath() ) );
+        }
+
+        List<Exclusion> exclusions = new ArrayList<Exclusion>( dependency.getExclusions().size() );
+        for ( org.apache.maven.model.Exclusion exclusion : dependency.getExclusions() )
+        {
+            exclusions.add( convert( exclusion ) );
+        }
+
+        Dependency result = new Dependency( artifact, dependency.getScope(), dependency.isOptional(), exclusions );
+
+        return result;
+    }
+
+    private Exclusion convert( org.apache.maven.model.Exclusion exclusion )
+    {
+        return new Exclusion( exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*" );
+    }
+
+    static RemoteRepository convert( Repository repository )
+    {
+        RemoteRepository result =
+            new RemoteRepository( repository.getId(), repository.getLayout(), repository.getUrl() );
+        result.setPolicy( true, convert( repository.getSnapshots() ) );
+        result.setPolicy( false, convert( repository.getReleases() ) );
+        return result;
+    }
+
+    private static RepositoryPolicy convert( org.apache.maven.model.RepositoryPolicy policy )
+    {
+        boolean enabled = true;
+        String checksums = RepositoryPolicy.CHECKSUM_POLICY_WARN;
+        String updates = RepositoryPolicy.UPDATE_POLICY_DAILY;
+
+        if ( policy != null )
+        {
+            enabled = policy.isEnabled();
+            if ( policy.getUpdatePolicy() != null )
+            {
+                updates = policy.getUpdatePolicy();
+            }
+            if ( policy.getChecksumPolicy() != null )
+            {
+                checksums = policy.getChecksumPolicy();
+            }
+        }
+
+        return new RepositoryPolicy( enabled, updates, checksums );
+    }
+
+    private void missingDescriptor( RepositorySystemSession session, Artifact artifact )
+    {
+        RepositoryListener listener = session.getRepositoryListener();
+        if ( listener != null )
+        {
+            DefaultRepositoryEvent event = new DefaultRepositoryEvent( session, artifact );
+            listener.artifactDescriptorMissing( event );
+        }
+    }
+
+    private void invalidDescriptor( RepositorySystemSession session, Artifact artifact, Exception exception )
+    {
+        RepositoryListener listener = session.getRepositoryListener();
+        if ( listener != null )
+        {
+            DefaultRepositoryEvent event = new DefaultRepositoryEvent( session, artifact );
+            event.setException( exception );
+            listener.artifactDescriptorInvalid( event );
+        }
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelCache.java

@@ -0,0 +1,119 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.apache.maven.model.building.ModelCache;
+import org.sonatype.aether.RepositoryCache;
+import org.sonatype.aether.RepositorySystemSession;
+
+/**
+ * A model builder cache backed by the repository system cache.
+ * 
+ * @author Benjamin Bentmann
+ */
+class DefaultModelCache
+    implements ModelCache
+{
+
+    private final RepositorySystemSession session;
+
+    private final RepositoryCache cache;
+
+    public static ModelCache newInstance( RepositorySystemSession session )
+    {
+        if ( session.getCache() == null )
+        {
+            return null;
+        }
+        else
+        {
+            return new DefaultModelCache( session );
+        }
+    }
+
+    private DefaultModelCache( RepositorySystemSession session )
+    {
+        this.session = session;
+        this.cache = session.getCache();
+    }
+
+    public Object get( String groupId, String artifactId, String version, String tag )
+    {
+        return cache.get( session, new Key( groupId, artifactId, version, tag ) );
+    }
+
+    public void put( String groupId, String artifactId, String version, String tag, Object data )
+    {
+        cache.put( session, new Key( groupId, artifactId, version, tag ), data );
+    }
+
+    static class Key
+    {
+
+        private final String groupId;
+
+        private final String artifactId;
+
+        private final String version;
+
+        private final String tag;
+
+        private final int hash;
+
+        public Key( String groupId, String artifactId, String version, String tag )
+        {
+            this.groupId = groupId;
+            this.artifactId = artifactId;
+            this.version = version;
+            this.tag = tag;
+
+            int h = 17;
+            h = h * 31 + this.groupId.hashCode();
+            h = h * 31 + this.artifactId.hashCode();
+            h = h * 31 + this.version.hashCode();
+            h = h * 31 + this.tag.hashCode();
+            hash = h;
+        }
+
+        @Override
+        public boolean equals( Object obj )
+        {
+            if ( this == obj )
+            {
+                return true;
+            }
+            if ( null == obj || !getClass().equals( obj.getClass() ) )
+            {
+                return false;
+            }
+
+            Key that = (Key) obj;
+            return artifactId.equals( that.artifactId ) && groupId.equals( that.groupId )
+                && version.equals( that.version ) && tag.equals( that.tag );
+        }
+
+        @Override
+        public int hashCode()
+        {
+            return hash;
+        }
+
+    }
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultModelResolver.java

@@ -0,0 +1,128 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.maven.model.Repository;
+import org.apache.maven.model.building.FileModelSource;
+import org.apache.maven.model.building.ModelSource;
+import org.apache.maven.model.resolution.InvalidRepositoryException;
+import org.apache.maven.model.resolution.ModelResolver;
+import org.apache.maven.model.resolution.UnresolvableModelException;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.impl.ArtifactResolver;
+import org.sonatype.aether.impl.RemoteRepositoryManager;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.resolution.ArtifactRequest;
+import org.sonatype.aether.resolution.ArtifactResolutionException;
+import org.sonatype.aether.util.artifact.DefaultArtifact;
+
+/**
+ * A model resolver to assist building of dependency POMs. This resolver gives priority to those repositories that have
+ * been initially specified and repositories discovered in dependency POMs are recessively merged into the search chain.
+ * 
+ * @author Benjamin Bentmann
+ * @see DefaultArtifactDescriptorReader
+ */
+class DefaultModelResolver
+    implements ModelResolver
+{
+
+    private final RepositorySystemSession session;
+
+    private final String context;
+
+    private List<RemoteRepository> repositories;
+
+    private final ArtifactResolver resolver;
+
+    private final RemoteRepositoryManager remoteRepositoryManager;
+
+    private final Set<String> repositoryIds;
+
+    public DefaultModelResolver( RepositorySystemSession session, String context, ArtifactResolver resolver,
+                                 RemoteRepositoryManager remoteRepositoryManager, List<RemoteRepository> repositories )
+    {
+        this.session = session;
+        this.context = context;
+        this.resolver = resolver;
+        this.remoteRepositoryManager = remoteRepositoryManager;
+        this.repositories = repositories;
+        this.repositoryIds = new HashSet<String>();
+    }
+
+    private DefaultModelResolver( DefaultModelResolver original )
+    {
+        this.session = original.session;
+        this.context = original.context;
+        this.resolver = original.resolver;
+        this.remoteRepositoryManager = original.remoteRepositoryManager;
+        this.repositories = original.repositories;
+        this.repositoryIds = new HashSet<String>( original.repositoryIds );
+    }
+
+    public void addRepository( Repository repository )
+        throws InvalidRepositoryException
+    {
+        if ( !repositoryIds.add( repository.getId() ) )
+        {
+            return;
+        }
+
+        List<RemoteRepository> newRepositories =
+            Collections.singletonList( DefaultArtifactDescriptorReader.convert( repository ) );
+
+        this.repositories =
+            remoteRepositoryManager.aggregateRepositories( session, repositories, newRepositories, true );
+    }
+
+    public ModelResolver newCopy()
+    {
+        return new DefaultModelResolver( this );
+    }
+
+    public ModelSource resolveModel( String groupId, String artifactId, String version )
+        throws UnresolvableModelException
+    {
+        Artifact pomArtifact = new DefaultArtifact( groupId, artifactId, "", "pom", version );
+
+        try
+        {
+            ArtifactRequest request = new ArtifactRequest( pomArtifact, repositories, context );
+            pomArtifact = resolver.resolveArtifact( session, request ).getArtifact();
+        }
+        catch ( ArtifactResolutionException e )
+        {
+            throw new UnresolvableModelException( "Failed to resolve POM for " + groupId + ":" + artifactId + ":"
+                + version + " due to " + e.getMessage(), groupId, artifactId, version, e );
+        }
+
+        File pomFile = pomArtifact.getFile();
+
+        return new FileModelSource( pomFile );
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultServiceLocator.java

@@ -0,0 +1,51 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.sonatype.aether.impl.ArtifactDescriptorReader;
+import org.sonatype.aether.impl.MetadataGeneratorFactory;
+import org.sonatype.aether.impl.VersionRangeResolver;
+import org.sonatype.aether.impl.VersionResolver;
+
+/**
+ * A simple service locator that is already setup with all components from this library. To acquire a complete
+ * repository system, clients need to add some repository connectors for remote transfers. <em>Note:</em> This component
+ * is meant to assists those clients that employ the repository systems outside of an IoC container, Maven plugins
+ * should instead always use regular dependency injection to acquire the repository system.
+ * 
+ * @author Benjamin Bentmann
+ */
+public class DefaultServiceLocator
+    extends org.sonatype.aether.impl.internal.DefaultServiceLocator
+{
+
+    /**
+     * Creates a new service locator that already knows about all service implementations included this library.
+     */
+    public DefaultServiceLocator()
+    {
+        addService( ArtifactDescriptorReader.class, DefaultArtifactDescriptorReader.class );
+        addService( VersionResolver.class, DefaultVersionResolver.class );
+        addService( VersionRangeResolver.class, DefaultVersionRangeResolver.class );
+        addService( MetadataGeneratorFactory.class, SnapshotMetadataGeneratorFactory.class );
+        addService( MetadataGeneratorFactory.class, VersionsMetadataGeneratorFactory.class );
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultVersionRangeResolver.java

@@ -0,0 +1,269 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader;
+import org.codehaus.plexus.component.annotations.Component;
+import org.codehaus.plexus.component.annotations.Requirement;
+import org.codehaus.plexus.util.IOUtil;
+import org.sonatype.aether.RepositoryListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.util.listener.DefaultRepositoryEvent;
+import org.sonatype.aether.util.metadata.DefaultMetadata;
+import org.sonatype.aether.util.version.GenericVersionScheme;
+import org.sonatype.aether.version.InvalidVersionSpecificationException;
+import org.sonatype.aether.version.Version;
+import org.sonatype.aether.version.VersionConstraint;
+import org.sonatype.aether.version.VersionRange;
+import org.sonatype.aether.version.VersionScheme;
+import org.sonatype.aether.impl.MetadataResolver;
+import org.sonatype.aether.impl.VersionRangeResolver;
+import org.sonatype.aether.metadata.Metadata;
+import org.sonatype.aether.repository.ArtifactRepository;
+import org.sonatype.aether.repository.LocalRepositoryManager;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.WorkspaceReader;
+import org.sonatype.aether.resolution.MetadataRequest;
+import org.sonatype.aether.resolution.MetadataResult;
+import org.sonatype.aether.resolution.VersionRangeRequest;
+import org.sonatype.aether.resolution.VersionRangeResolutionException;
+import org.sonatype.aether.resolution.VersionRangeResult;
+import org.sonatype.aether.spi.locator.Service;
+import org.sonatype.aether.spi.locator.ServiceLocator;
+import org.sonatype.aether.spi.log.Logger;
+import org.sonatype.aether.spi.log.NullLogger;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = VersionRangeResolver.class )
+public class DefaultVersionRangeResolver
+    implements VersionRangeResolver, Service
+{
+
+    private static final String MAVEN_METADATA_XML = "maven-metadata.xml";
+
+    @Requirement
+    private Logger logger = NullLogger.INSTANCE;
+
+    @Requirement
+    private MetadataResolver metadataResolver;
+
+    public void initService( ServiceLocator locator )
+    {
+        setLogger( locator.getService( Logger.class ) );
+        setMetadataResolver( locator.getService( MetadataResolver.class ) );
+    }
+
+    public DefaultVersionRangeResolver setLogger( Logger logger )
+    {
+        this.logger = ( logger != null ) ? logger : NullLogger.INSTANCE;
+        return this;
+    }
+
+    public DefaultVersionRangeResolver setMetadataResolver( MetadataResolver metadataResolver )
+    {
+        if ( metadataResolver == null )
+        {
+            throw new IllegalArgumentException( "metadata resolver has not been specified" );
+        }
+        this.metadataResolver = metadataResolver;
+        return this;
+    }
+
+    public VersionRangeResult resolveVersionRange( RepositorySystemSession session, VersionRangeRequest request )
+        throws VersionRangeResolutionException
+    {
+        VersionRangeResult result = new VersionRangeResult( request );
+
+        VersionScheme versionScheme = new GenericVersionScheme();
+
+        VersionConstraint versionConstraint;
+        try
+        {
+            versionConstraint = versionScheme.parseVersionConstraint( request.getArtifact().getVersion() );
+        }
+        catch ( InvalidVersionSpecificationException e )
+        {
+            result.addException( e );
+            throw new VersionRangeResolutionException( result );
+        }
+
+        result.setVersionConstraint( versionConstraint );
+
+        if ( versionConstraint.getRanges().isEmpty() )
+        {
+            result.addVersion( versionConstraint.getVersion() );
+        }
+        else
+        {
+            Map<String, ArtifactRepository> versionIndex =
+                getVersions( session, result, request, getNature( session, versionConstraint.getRanges() ) );
+
+            List<Version> versions = new ArrayList<Version>();
+            for ( Map.Entry<String, ArtifactRepository> v : versionIndex.entrySet() )
+            {
+                try
+                {
+                    Version ver = versionScheme.parseVersion( v.getKey() );
+                    if ( versionConstraint.containsVersion( ver ) )
+                    {
+                        versions.add( ver );
+                        result.setRepository( ver, v.getValue() );
+                    }
+                }
+                catch ( InvalidVersionSpecificationException e )
+                {
+                    result.addException( e );
+                }
+            }
+
+            Collections.sort( versions );
+            result.setVersions( versions );
+        }
+
+        return result;
+    }
+
+    private Map<String, ArtifactRepository> getVersions( RepositorySystemSession session, VersionRangeResult result,
+                                                         VersionRangeRequest request, Metadata.Nature nature )
+    {
+        Map<String, ArtifactRepository> versionIndex = new HashMap<String, ArtifactRepository>();
+
+        Metadata metadata =
+            new DefaultMetadata( request.getArtifact().getGroupId(), request.getArtifact().getArtifactId(),
+                                 MAVEN_METADATA_XML, nature );
+
+        List<MetadataRequest> metadataRequests = new ArrayList<MetadataRequest>( request.getRepositories().size() );
+        for ( RemoteRepository repository : request.getRepositories() )
+        {
+            MetadataRequest metadataRequest = new MetadataRequest( metadata, repository, request.getRequestContext() );
+            metadataRequest.setDeleteLocalCopyIfMissing( true );
+            metadataRequests.add( metadataRequest );
+        }
+        List<MetadataResult> metadataResults = metadataResolver.resolveMetadata( session, metadataRequests );
+
+        WorkspaceReader workspace = session.getWorkspaceReader();
+        if ( workspace != null )
+        {
+            List<String> versions = workspace.findVersions( request.getArtifact() );
+            for ( String version : versions )
+            {
+                versionIndex.put( version, workspace.getRepository() );
+            }
+        }
+
+        LocalRepositoryManager lrm = session.getLocalRepositoryManager();
+        File localMetadataFile = new File( lrm.getRepository().getBasedir(), lrm.getPathForLocalMetadata( metadata ) );
+        if ( localMetadataFile.isFile() )
+        {
+            metadata = metadata.setFile( localMetadataFile );
+            Versioning versioning = readVersions( session, metadata, result );
+            for ( String version : versioning.getVersions() )
+            {
+                if ( !versionIndex.containsKey( version ) )
+                {
+                    versionIndex.put( version, lrm.getRepository() );
+                }
+            }
+        }
+
+        for ( MetadataResult metadataResult : metadataResults )
+        {
+            result.addException( metadataResult.getException() );
+            Versioning versioning = readVersions( session, metadataResult.getMetadata(), result );
+            for ( String version : versioning.getVersions() )
+            {
+                if ( !versionIndex.containsKey( version ) )
+                {
+                    versionIndex.put( version, metadataResult.getRequest().getRepository() );
+                }
+            }
+        }
+
+        return versionIndex;
+    }
+
+    private Metadata.Nature getNature( RepositorySystemSession session, Collection<VersionRange> ranges )
+    {
+        for ( VersionRange range : ranges )
+        {
+            if ( range.acceptsSnapshots() )
+            {
+                return Metadata.Nature.RELEASE_OR_SNAPSHOT;
+            }
+        }
+        return Metadata.Nature.RELEASE;
+    }
+
+    private Versioning readVersions( RepositorySystemSession session, Metadata metadata, VersionRangeResult result )
+    {
+        Versioning versioning = null;
+
+        FileInputStream fis = null;
+        try
+        {
+            if ( metadata != null && metadata.getFile() != null )
+            {
+                fis = new FileInputStream( metadata.getFile() );
+                org.apache.maven.artifact.repository.metadata.Metadata m = new MetadataXpp3Reader().read( fis, false );
+                versioning = m.getVersioning();
+            }
+        }
+        catch ( FileNotFoundException e )
+        {
+            // tolerable
+        }
+        catch ( Exception e )
+        {
+            invalidMetadata( session, metadata, e );
+            result.addException( e );
+        }
+        finally
+        {
+            IOUtil.close( fis );
+        }
+
+        return ( versioning != null ) ? versioning : new Versioning();
+    }
+
+    private void invalidMetadata( RepositorySystemSession session, Metadata metadata, Exception exception )
+    {
+        RepositoryListener listener = session.getRepositoryListener();
+        if ( listener != null )
+        {
+            DefaultRepositoryEvent event = new DefaultRepositoryEvent( session, metadata );
+            event.setException( exception );
+            listener.metadataInvalid( event );
+        }
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/DefaultVersionResolver.java

@@ -0,0 +1,487 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.maven.artifact.repository.metadata.Snapshot;
+import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader;
+import org.codehaus.plexus.component.annotations.Component;
+import org.codehaus.plexus.component.annotations.Requirement;
+import org.codehaus.plexus.util.IOUtil;
+import org.codehaus.plexus.util.StringUtils;
+import org.sonatype.aether.RepositoryCache;
+import org.sonatype.aether.RepositoryListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.util.listener.DefaultRepositoryEvent;
+import org.sonatype.aether.util.metadata.DefaultMetadata;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.impl.MetadataResolver;
+import org.sonatype.aether.impl.VersionResolver;
+import org.sonatype.aether.impl.internal.CacheUtils;
+import org.sonatype.aether.metadata.Metadata;
+import org.sonatype.aether.repository.ArtifactRepository;
+import org.sonatype.aether.repository.LocalRepositoryManager;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.WorkspaceReader;
+import org.sonatype.aether.repository.WorkspaceRepository;
+import org.sonatype.aether.resolution.MetadataRequest;
+import org.sonatype.aether.resolution.MetadataResult;
+import org.sonatype.aether.resolution.VersionRequest;
+import org.sonatype.aether.resolution.VersionResolutionException;
+import org.sonatype.aether.resolution.VersionResult;
+import org.sonatype.aether.spi.locator.Service;
+import org.sonatype.aether.spi.locator.ServiceLocator;
+import org.sonatype.aether.spi.log.Logger;
+import org.sonatype.aether.spi.log.NullLogger;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = VersionResolver.class )
+public class DefaultVersionResolver
+    implements VersionResolver, Service
+{
+
+    private static final String MAVEN_METADATA_XML = "maven-metadata.xml";
+
+    private static final String RELEASE = "RELEASE";
+
+    private static final String LATEST = "LATEST";
+
+    private static final String SNAPSHOT = "SNAPSHOT";
+
+    @Requirement
+    private Logger logger = NullLogger.INSTANCE;
+
+    @Requirement
+    private MetadataResolver metadataResolver;
+
+    public void initService( ServiceLocator locator )
+    {
+        setLogger( locator.getService( Logger.class ) );
+        setMetadataResolver( locator.getService( MetadataResolver.class ) );
+    }
+
+    public DefaultVersionResolver setLogger( Logger logger )
+    {
+        this.logger = ( logger != null ) ? logger : NullLogger.INSTANCE;
+        return this;
+    }
+
+    public DefaultVersionResolver setMetadataResolver( MetadataResolver metadataResolver )
+    {
+        if ( metadataResolver == null )
+        {
+            throw new IllegalArgumentException( "metadata resolver has not been specified" );
+        }
+        this.metadataResolver = metadataResolver;
+        return this;
+    }
+
+    public VersionResult resolveVersion( RepositorySystemSession session, VersionRequest request )
+        throws VersionResolutionException
+    {
+        Artifact artifact = request.getArtifact();
+
+        String version = artifact.getVersion();
+
+        VersionResult result = new VersionResult( request );
+
+        Key cacheKey = null;
+        RepositoryCache cache = session.getCache();
+        if ( cache != null )
+        {
+            cacheKey = new Key( session, request );
+
+            Object obj = cache.get( session, cacheKey );
+            if ( obj instanceof Record )
+            {
+                Record record = (Record) obj;
+                result.setVersion( record.version );
+                result.setRepository( CacheUtils.getRepository( session, request.getRepositories(), record.repoClass,
+                                                                record.repoId ) );
+                return result;
+            }
+        }
+
+        Metadata metadata;
+
+        if ( RELEASE.equals( version ) )
+        {
+            metadata =
+                new DefaultMetadata( artifact.getGroupId(), artifact.getArtifactId(), MAVEN_METADATA_XML,
+                                     Metadata.Nature.RELEASE );
+        }
+        else if ( LATEST.equals( version ) )
+        {
+            metadata =
+                new DefaultMetadata( artifact.getGroupId(), artifact.getArtifactId(), MAVEN_METADATA_XML,
+                                     Metadata.Nature.RELEASE_OR_SNAPSHOT );
+        }
+        else if ( version.endsWith( SNAPSHOT ) )
+        {
+            WorkspaceReader workspace = session.getWorkspaceReader();
+            if ( workspace != null && workspace.findVersions( artifact ).contains( version ) )
+            {
+                metadata = null;
+                result.setRepository( workspace.getRepository() );
+            }
+            else
+            {
+                metadata =
+                    new DefaultMetadata( artifact.getGroupId(), artifact.getArtifactId(), version, MAVEN_METADATA_XML,
+                                         Metadata.Nature.SNAPSHOT );
+            }
+        }
+        else
+        {
+            metadata = null;
+        }
+
+        if ( metadata == null )
+        {
+            result.setVersion( version );
+        }
+        else
+        {
+            List<MetadataRequest> metadataRequests = new ArrayList<MetadataRequest>( request.getRepositories().size() );
+            for ( RemoteRepository repository : request.getRepositories() )
+            {
+                MetadataRequest metadataRequest =
+                    new MetadataRequest( metadata, repository, request.getRequestContext() );
+                metadataRequest.setDeleteLocalCopyIfMissing( true );
+                metadataRequest.setFavorLocalRepository( true );
+                metadataRequests.add( metadataRequest );
+            }
+            List<MetadataResult> metadataResults = metadataResolver.resolveMetadata( session, metadataRequests );
+
+            LocalRepositoryManager lrm = session.getLocalRepositoryManager();
+            File localMetadataFile =
+                new File( lrm.getRepository().getBasedir(), lrm.getPathForLocalMetadata( metadata ) );
+            if ( localMetadataFile.isFile() )
+            {
+                metadata = metadata.setFile( localMetadataFile );
+            }
+
+            Map<String, VersionInfo> infos = new HashMap<String, VersionInfo>();
+            merge( artifact, infos, readVersions( session, metadata, result ),
+                   session.getLocalRepositoryManager().getRepository() );
+
+            for ( MetadataResult metadataResult : metadataResults )
+            {
+                result.addException( metadataResult.getException() );
+                merge( artifact, infos, readVersions( session, metadataResult.getMetadata(), result ),
+                       metadataResult.getRequest().getRepository() );
+            }
+
+            if ( RELEASE.equals( version ) )
+            {
+                resolve( result, infos, RELEASE );
+            }
+            else if ( LATEST.equals( version ) )
+            {
+                if ( !resolve( result, infos, LATEST ) )
+                {
+                    resolve( result, infos, RELEASE );
+                }
+
+                if ( result.getVersion() != null && result.getVersion().endsWith( SNAPSHOT ) )
+                {
+                    VersionRequest subRequest = new VersionRequest();
+                    subRequest.setArtifact( artifact.setVersion( result.getVersion() ) );
+                    if ( result.getRepository() instanceof RemoteRepository )
+                    {
+                        subRequest.setRepositories( Collections.singletonList( (RemoteRepository) result.getRepository() ) );
+                    }
+                    else
+                    {
+                        subRequest.setRepositories( request.getRepositories() );
+                    }
+                    VersionResult subResult = resolveVersion( session, subRequest );
+                    result.setVersion( subResult.getVersion() );
+                    result.setRepository( subResult.getRepository() );
+                    for ( Exception exception : subResult.getExceptions() )
+                    {
+                        result.addException( exception );
+                    }
+                }
+            }
+            else
+            {
+                if ( !resolve( result, infos, SNAPSHOT + artifact.getClassifier() )
+                    && !resolve( result, infos, SNAPSHOT ) )
+                {
+                    result.setVersion( version );
+                }
+            }
+
+            if ( StringUtils.isEmpty( result.getVersion() ) )
+            {
+                throw new VersionResolutionException( result );
+            }
+        }
+
+        if ( cacheKey != null && metadata != null )
+        {
+            cache.put( session, cacheKey, new Record( result.getVersion(), result.getRepository() ) );
+        }
+
+        return result;
+    }
+
+    private boolean resolve( VersionResult result, Map<String, VersionInfo> infos, String key )
+    {
+        VersionInfo info = infos.get( key );
+        if ( info != null )
+        {
+            result.setVersion( info.version );
+            result.setRepository( info.repository );
+        }
+        return info != null;
+    }
+
+    private Versioning readVersions( RepositorySystemSession session, Metadata metadata, VersionResult result )
+    {
+        Versioning versioning = null;
+
+        FileInputStream fis = null;
+        try
+        {
+            if ( metadata != null && metadata.getFile() != null )
+            {
+                fis = new FileInputStream( metadata.getFile() );
+                org.apache.maven.artifact.repository.metadata.Metadata m = new MetadataXpp3Reader().read( fis, false );
+                versioning = m.getVersioning();
+            }
+        }
+        catch ( FileNotFoundException e )
+        {
+            // tolerable
+        }
+        catch ( Exception e )
+        {
+            invalidMetadata( session, metadata, e );
+            result.addException( e );
+        }
+        finally
+        {
+            IOUtil.close( fis );
+        }
+
+        return ( versioning != null ) ? versioning : new Versioning();
+    }
+
+    private void invalidMetadata( RepositorySystemSession session, Metadata metadata, Exception exception )
+    {
+        RepositoryListener listener = session.getRepositoryListener();
+        if ( listener != null )
+        {
+            DefaultRepositoryEvent event = new DefaultRepositoryEvent( session, metadata );
+            event.setException( exception );
+            listener.metadataInvalid( event );
+        }
+    }
+
+    private void merge( Artifact artifact, Map<String, VersionInfo> infos, Versioning versioning,
+                        ArtifactRepository repository )
+    {
+        if ( StringUtils.isNotEmpty( versioning.getRelease() ) )
+        {
+            merge( RELEASE, infos, versioning.getLastUpdated(), versioning.getRelease(), repository );
+        }
+
+        if ( StringUtils.isNotEmpty( versioning.getLatest() ) )
+        {
+            merge( LATEST, infos, versioning.getLastUpdated(), versioning.getLatest(), repository );
+        }
+
+        boolean mainSnapshot = false;
+        for ( SnapshotVersion sv : versioning.getSnapshotVersions() )
+        {
+            if ( StringUtils.isNotEmpty( sv.getVersion() ) )
+            {
+                mainSnapshot |= sv.getClassifier().length() <= 0;
+                merge( SNAPSHOT + sv.getClassifier(), infos, sv.getUpdated(), sv.getVersion(), repository );
+            }
+        }
+
+        Snapshot snapshot = versioning.getSnapshot();
+        if ( !mainSnapshot && snapshot != null )
+        {
+            String version = artifact.getVersion();
+            if ( snapshot.getTimestamp() != null && snapshot.getBuildNumber() > 0 )
+            {
+                String qualifier = snapshot.getTimestamp() + '-' + snapshot.getBuildNumber();
+                version = version.substring( 0, version.length() - SNAPSHOT.length() ) + qualifier;
+            }
+            merge( SNAPSHOT, infos, versioning.getLastUpdated(), version, repository );
+        }
+    }
+
+    private void merge( String key, Map<String, VersionInfo> infos, String timestamp, String version,
+                        ArtifactRepository repository )
+    {
+        VersionInfo info = infos.get( key );
+        if ( info == null )
+        {
+            info = new VersionInfo( timestamp, version, repository );
+            infos.put( key, info );
+        }
+        else if ( info.isOutdated( timestamp ) )
+        {
+            info.version = version;
+            info.repository = repository;
+        }
+    }
+
+    private static class VersionInfo
+    {
+
+        String timestamp;
+
+        String version;
+
+        ArtifactRepository repository;
+
+        public VersionInfo( String timestamp, String version, ArtifactRepository repository )
+        {
+            this.timestamp = ( timestamp != null ) ? timestamp : "";
+            this.version = version;
+            this.repository = repository;
+        }
+
+        public boolean isOutdated( String timestamp )
+        {
+            return timestamp != null && timestamp.compareTo( this.timestamp ) > 0;
+        }
+
+    }
+
+    private static class Key
+    {
+
+        private final String groupId;
+
+        private final String artifactId;
+
+        private final String version;
+
+        private final String context;
+
+        private final File localRepo;
+
+        private final WorkspaceRepository workspace;
+
+        private final List<RemoteRepository> repositories;
+
+        private final int hashCode;
+
+        public Key( RepositorySystemSession session, VersionRequest request )
+        {
+            groupId = request.getArtifact().getGroupId();
+            artifactId = request.getArtifact().getArtifactId();
+            version = request.getArtifact().getVersion();
+            context = request.getRequestContext();
+            localRepo = session.getLocalRepository().getBasedir();
+            workspace = CacheUtils.getWorkspace( session );
+            repositories = new ArrayList<RemoteRepository>( request.getRepositories().size() );
+            for ( RemoteRepository repository : request.getRepositories() )
+            {
+                if ( repository.isRepositoryManager() )
+                {
+                    repositories.addAll( repository.getMirroredRepositories() );
+                }
+                else
+                {
+                    repositories.add( repository );
+                }
+            }
+
+            int hash = 17;
+            hash = hash * 31 + groupId.hashCode();
+            hash = hash * 31 + artifactId.hashCode();
+            hash = hash * 31 + version.hashCode();
+            hash = hash * 31 + localRepo.hashCode();
+            hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
+            hashCode = hash;
+        }
+
+        @Override
+        public boolean equals( Object obj )
+        {
+            if ( obj == this )
+            {
+                return true;
+            }
+            else if ( obj == null || !getClass().equals( obj.getClass() ) )
+            {
+                return false;
+            }
+
+            Key that = (Key) obj;
+            return artifactId.equals( that.artifactId ) && groupId.equals( that.groupId )
+                && version.equals( that.version ) && context.equals( that.context )
+                && localRepo.equals( that.localRepo ) && CacheUtils.eq( workspace, that.workspace )
+                && CacheUtils.repositoriesEquals( repositories, that.repositories );
+        }
+
+        @Override
+        public int hashCode()
+        {
+            return hashCode;
+        }
+
+    }
+
+    private static class Record
+    {
+        final String version;
+
+        final String repoId;
+
+        final Class<?> repoClass;
+
+        public Record( String version, ArtifactRepository repository )
+        {
+            this.version = version;
+            if ( repository != null )
+            {
+                repoId = repository.getId();
+                repoClass = repository.getClass();
+            }
+            else
+            {
+                repoId = null;
+                repoClass = null;
+            }
+        }
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/LocalSnapshotMetadata.java

@@ -0,0 +1,102 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+
+import org.apache.maven.artifact.repository.metadata.Metadata;
+import org.apache.maven.artifact.repository.metadata.Snapshot;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.sonatype.aether.artifact.Artifact;
+
+/**
+ * @author Benjamin Bentmann
+ */
+final class LocalSnapshotMetadata
+    extends MavenMetadata
+{
+
+    private final Artifact artifact;
+
+    public LocalSnapshotMetadata( Artifact artifact )
+    {
+        super( createMetadata( artifact ), null );
+        this.artifact = artifact;
+    }
+
+    public LocalSnapshotMetadata( Artifact artifact, File file )
+    {
+        super( createMetadata( artifact ), file );
+        this.artifact = artifact;
+    }
+
+    private static Metadata createMetadata( Artifact artifact )
+    {
+        Snapshot snapshot = new Snapshot();
+        snapshot.setLocalCopy( true );
+        Versioning versioning = new Versioning();
+        versioning.setSnapshot( snapshot );
+
+        Metadata metadata = new Metadata();
+        metadata.setModelVersion( "1.0.0" );
+        metadata.setVersioning( versioning );
+        metadata.setGroupId( artifact.getGroupId() );
+        metadata.setArtifactId( artifact.getArtifactId() );
+        metadata.setVersion( artifact.getBaseVersion() );
+
+        return metadata;
+    }
+
+    public MavenMetadata setFile( File file )
+    {
+        return new LocalSnapshotMetadata( artifact, file );
+    }
+
+    public Object getKey()
+    {
+        return getGroupId() + ':' + getArtifactId() + ':' + getVersion();
+    }
+
+    public static Object getKey( Artifact artifact )
+    {
+        return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
+    }
+
+    public String getGroupId()
+    {
+        return artifact.getGroupId();
+    }
+
+    public String getArtifactId()
+    {
+        return artifact.getArtifactId();
+    }
+
+    public String getVersion()
+    {
+        return artifact.getBaseVersion();
+    }
+
+    public Nature getNature()
+    {
+        return Nature.SNAPSHOT;
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/LocalSnapshotMetadataGenerator.java

@@ -0,0 +1,76 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.impl.MetadataGenerator;
+import org.sonatype.aether.installation.InstallRequest;
+import org.sonatype.aether.metadata.Metadata;
+
+/**
+ * @author Benjamin Bentmann
+ */
+class LocalSnapshotMetadataGenerator
+    implements MetadataGenerator
+{
+
+    private Map<Object, LocalSnapshotMetadata> snapshots;
+
+    public LocalSnapshotMetadataGenerator( RepositorySystemSession session, InstallRequest request )
+    {
+        snapshots = new LinkedHashMap<Object, LocalSnapshotMetadata>();
+    }
+
+    public Collection<? extends Metadata> prepare( Collection<? extends Artifact> artifacts )
+    {
+        for ( Artifact artifact : artifacts )
+        {
+            if ( artifact.isSnapshot() )
+            {
+                Object key = LocalSnapshotMetadata.getKey( artifact );
+                LocalSnapshotMetadata snapshotMetadata = snapshots.get( key );
+                if ( snapshotMetadata == null )
+                {
+                    snapshotMetadata = new LocalSnapshotMetadata( artifact );
+                    snapshots.put( key, snapshotMetadata );
+                }
+            }
+        }
+
+        return Collections.emptyList();
+    }
+
+    public Artifact transformArtifact( Artifact artifact )
+    {
+        return artifact;
+    }
+
+    public Collection<? extends Metadata> finish( Collection<? extends Artifact> artifacts )
+    {
+        return snapshots.values();
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/MavenMetadata.java

@@ -0,0 +1,171 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.Writer;
+
+import org.apache.maven.artifact.repository.metadata.Metadata;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader;
+import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Writer;
+import org.codehaus.plexus.util.IOUtil;
+import org.codehaus.plexus.util.ReaderFactory;
+import org.codehaus.plexus.util.WriterFactory;
+import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
+import org.sonatype.aether.RepositoryException;
+import org.sonatype.aether.metadata.MergeableMetadata;
+
+/**
+ * @author Benjamin Bentmann
+ */
+abstract class MavenMetadata
+    implements MergeableMetadata
+{
+
+    private final File file;
+
+    protected Metadata metadata;
+
+    private boolean merged;
+
+    protected MavenMetadata( Metadata metadata, File file )
+    {
+        this.metadata = metadata;
+        this.file = file;
+    }
+
+    public String getType()
+    {
+        return "maven-metadata.xml";
+    }
+
+    public File getFile()
+    {
+        return file;
+    }
+
+    public void merge( File existing, File result )
+        throws RepositoryException
+    {
+        Metadata recessive = read( existing );
+
+        merge( recessive );
+
+        write( result, metadata );
+
+        merged = true;
+    }
+
+    public boolean isMerged()
+    {
+        return merged;
+    }
+
+    protected void merge( Metadata recessive )
+    {
+        Versioning versioning = recessive.getVersioning();
+        if ( versioning != null )
+        {
+            versioning.setLastUpdated( null );
+        }
+
+        Metadata dominant = metadata;
+
+        versioning = dominant.getVersioning();
+        if ( versioning != null )
+        {
+            versioning.updateTimestamp();
+        }
+
+        dominant.merge( recessive );
+    }
+
+    private Metadata read( File metadataFile )
+        throws RepositoryException
+    {
+        if ( metadataFile.length() <= 0 )
+        {
+            return new Metadata();
+        }
+
+        Reader reader = null;
+        try
+        {
+            reader = ReaderFactory.newXmlReader( metadataFile );
+            return new MetadataXpp3Reader().read( reader, false );
+        }
+        catch ( IOException e )
+        {
+            throw new RepositoryException( "Could not read metadata " + metadataFile + ": " + e.getMessage(), e );
+        }
+        catch ( XmlPullParserException e )
+        {
+            throw new RepositoryException( "Could not parse metadata " + metadataFile + ": " + e.getMessage(), e );
+        }
+        finally
+        {
+            IOUtil.close( reader );
+        }
+    }
+
+    private void write( File metadataFile, Metadata metadata )
+        throws RepositoryException
+    {
+        Writer writer = null;
+        try
+        {
+            metadataFile.getParentFile().mkdirs();
+            writer = WriterFactory.newXmlWriter( metadataFile );
+            new MetadataXpp3Writer().write( writer, metadata );
+        }
+        catch ( IOException e )
+        {
+            throw new RepositoryException( "Could not write metadata " + metadataFile + ": " + e.getMessage(), e );
+        }
+        finally
+        {
+            IOUtil.close( writer );
+        }
+    }
+
+    @Override
+    public String toString()
+    {
+        StringBuilder buffer = new StringBuilder( 128 );
+        if ( getGroupId().length() > 0 )
+        {
+            buffer.append( getGroupId() );
+        }
+        if ( getArtifactId().length() > 0 )
+        {
+            buffer.append( ':' ).append( getArtifactId() );
+        }
+        if ( getVersion().length() > 0 )
+        {
+            buffer.append( ':' ).append( getVersion() );
+        }
+        buffer.append( '/' ).append( getType() );
+        return buffer.toString();
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/MavenRepositorySystemSession.java

@@ -0,0 +1,104 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.sonatype.aether.collection.DependencyGraphTransformer;
+import org.sonatype.aether.collection.DependencyManager;
+import org.sonatype.aether.collection.DependencySelector;
+import org.sonatype.aether.collection.DependencyTraverser;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.artifact.DefaultArtifactType;
+import org.sonatype.aether.util.artifact.DefaultArtifactTypeRegistry;
+import org.sonatype.aether.util.graph.manager.ClassicDependencyManager;
+import org.sonatype.aether.util.graph.selector.AndDependencySelector;
+import org.sonatype.aether.util.graph.selector.ExclusionDependencySelector;
+import org.sonatype.aether.util.graph.selector.OptionalDependencySelector;
+import org.sonatype.aether.util.graph.selector.ScopeDependencySelector;
+import org.sonatype.aether.util.graph.transformer.ChainedDependencyGraphTransformer;
+import org.sonatype.aether.util.graph.transformer.ConflictMarker;
+import org.sonatype.aether.util.graph.transformer.JavaDependencyContextRefiner;
+import org.sonatype.aether.util.graph.transformer.JavaEffectiveScopeCalculator;
+import org.sonatype.aether.util.graph.transformer.NearestVersionConflictResolver;
+import org.sonatype.aether.util.graph.traverser.FatArtifactTraverser;
+import org.sonatype.aether.util.repository.DefaultAuthenticationSelector;
+import org.sonatype.aether.util.repository.DefaultMirrorSelector;
+import org.sonatype.aether.util.repository.DefaultProxySelector;
+
+/**
+ * A simplistic repository system session that mimics Maven's behavior to help third-party developers that want to embed
+ * Maven's dependency resolution into their own applications. <strong>Warning:</strong> This class is not intended for
+ * usage by Maven plugins, those should always acquire the current repository system session via parameter injection.
+ * 
+ * @author Benjamin Bentmann
+ */
+public class MavenRepositorySystemSession
+    extends DefaultRepositorySystemSession
+{
+
+    /**
+     * Creates a new Maven-like repository system session by initializing the session with values typical for
+     * Maven-based resolution.
+     */
+    public MavenRepositorySystemSession()
+    {
+        setMirrorSelector( new DefaultMirrorSelector() );
+        setAuthenticationSelector( new DefaultAuthenticationSelector() );
+        setProxySelector( new DefaultProxySelector() );
+
+        DependencyTraverser depTraverser = new FatArtifactTraverser();
+        setDependencyTraverser( depTraverser );
+
+        DependencyManager depManager = new ClassicDependencyManager();
+        setDependencyManager( depManager );
+
+        DependencySelector depFilter =
+            new AndDependencySelector( new ScopeDependencySelector( "test", "provided" ),
+                                       new OptionalDependencySelector(), new ExclusionDependencySelector() );
+        setDependencySelector( depFilter );
+
+        DependencyGraphTransformer transformer =
+            new ChainedDependencyGraphTransformer( new ConflictMarker(), new JavaEffectiveScopeCalculator(),
+                                                   new NearestVersionConflictResolver(),
+                                                   new JavaDependencyContextRefiner() );
+        setDependencyGraphTransformer( transformer );
+
+        DefaultArtifactTypeRegistry stereotypes = new DefaultArtifactTypeRegistry();
+        stereotypes.add( new DefaultArtifactType( "pom" ) );
+        stereotypes.add( new DefaultArtifactType( "maven-plugin", "jar", "", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "jar", "jar", "", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "ejb", "jar", "", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "ejb-client", "jar", "client", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "test-jar", "jar", "tests", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "javadoc", "jar", "javadoc", "java" ) );
+        stereotypes.add( new DefaultArtifactType( "java-source", "jar", "sources", "java", false, false ) );
+        stereotypes.add( new DefaultArtifactType( "war", "war", "", "java", false, true ) );
+        stereotypes.add( new DefaultArtifactType( "ear", "ear", "", "java", false, true ) );
+        stereotypes.add( new DefaultArtifactType( "rar", "rar", "", "java", false, true ) );
+        stereotypes.add( new DefaultArtifactType( "par", "par", "", "java", false, true ) );
+        setArtifactTypeRegistry( stereotypes );
+
+        setIgnoreInvalidArtifactDescriptor( true );
+        setIgnoreMissingArtifactDescriptor( true );
+
+        setSystemProps( System.getProperties() );
+        setConfigProps( System.getProperties() );
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/RelocatedArtifact.java

@@ -0,0 +1,126 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.util.Map;
+
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.util.artifact.AbstractArtifact;
+
+/**
+ * @author Benjamin Bentmann
+ */
+final class RelocatedArtifact
+    extends AbstractArtifact
+{
+
+    private final Artifact artifact;
+
+    private final String groupId;
+
+    private final String artifactId;
+
+    private final String version;
+
+    public RelocatedArtifact( Artifact artifact, String groupId, String artifactId, String version )
+    {
+        if ( artifact == null )
+        {
+            throw new IllegalArgumentException( "no artifact specified" );
+        }
+        this.artifact = artifact;
+        this.groupId = ( groupId != null && groupId.length() > 0 ) ? groupId : null;
+        this.artifactId = ( artifactId != null && artifactId.length() > 0 ) ? artifactId : null;
+        this.version = ( version != null && version.length() > 0 ) ? version : null;
+    }
+
+    public String getGroupId()
+    {
+        if ( groupId != null )
+        {
+            return groupId;
+        }
+        else
+        {
+            return artifact.getGroupId();
+        }
+    }
+
+    public String getArtifactId()
+    {
+        if ( artifactId != null )
+        {
+            return artifactId;
+        }
+        else
+        {
+            return artifact.getArtifactId();
+        }
+    }
+
+    public String getVersion()
+    {
+        if ( version != null )
+        {
+            return version;
+        }
+        else
+        {
+            return artifact.getVersion();
+        }
+    }
+
+    public String getBaseVersion()
+    {
+        return toBaseVersion( getVersion() );
+    }
+
+    public boolean isSnapshot()
+    {
+        return isSnapshot( getVersion() );
+    }
+
+    public String getClassifier()
+    {
+        return artifact.getClassifier();
+    }
+
+    public String getExtension()
+    {
+        return artifact.getExtension();
+    }
+
+    public File getFile()
+    {
+        return artifact.getFile();
+    }
+
+    public String getProperty( String key, String defaultValue )
+    {
+        return artifact.getProperty( key, defaultValue );
+    }
+
+    public Map<String, String> getProperties()
+    {
+        return artifact.getProperties();
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/RemoteSnapshotMetadata.java

@@ -0,0 +1,196 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.TimeZone;
+
+import org.apache.maven.artifact.repository.metadata.Metadata;
+import org.apache.maven.artifact.repository.metadata.Snapshot;
+import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.sonatype.aether.artifact.Artifact;
+
+/**
+ * @author Benjamin Bentmann
+ */
+final class RemoteSnapshotMetadata
+    extends MavenMetadata
+{
+
+    private static final String SNAPSHOT = "SNAPSHOT";
+
+    private final Collection<Artifact> artifacts = new ArrayList<Artifact>();
+
+    private final Map<String, SnapshotVersion> versions = new LinkedHashMap<String, SnapshotVersion>();
+
+    public RemoteSnapshotMetadata( Artifact artifact )
+    {
+        super( createMetadata( artifact ), null );
+    }
+
+    private RemoteSnapshotMetadata( Metadata metadata, File file )
+    {
+        super( metadata, file );
+    }
+
+    private static Metadata createMetadata( Artifact artifact )
+    {
+        Metadata metadata = new Metadata();
+        metadata.setModelVersion( "1.1.0" );
+        metadata.setGroupId( artifact.getGroupId() );
+        metadata.setArtifactId( artifact.getArtifactId() );
+        metadata.setVersion( artifact.getBaseVersion() );
+
+        return metadata;
+    }
+
+    public void bind( Artifact artifact )
+    {
+        artifacts.add( artifact );
+    }
+
+    public MavenMetadata setFile( File file )
+    {
+        return new RemoteSnapshotMetadata( metadata, file );
+    }
+
+    public Object getKey()
+    {
+        return getGroupId() + ':' + getArtifactId() + ':' + getVersion();
+    }
+
+    public static Object getKey( Artifact artifact )
+    {
+        return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
+    }
+
+    public String getExpandedVersion( Artifact artifact )
+    {
+        return versions.get( artifact.getClassifier() ).getVersion();
+    }
+
+    @Override
+    protected void merge( Metadata recessive )
+    {
+        Snapshot snapshot;
+        String lastUpdated = "";
+
+        if ( metadata.getVersioning() == null )
+        {
+            DateFormat utcDateFormatter = new SimpleDateFormat( "yyyyMMdd.HHmmss" );
+            utcDateFormatter.setTimeZone( TimeZone.getTimeZone( "UTC" ) );
+
+            snapshot = new Snapshot();
+            snapshot.setBuildNumber( getBuildNumber( recessive ) + 1 );
+            snapshot.setTimestamp( utcDateFormatter.format( new Date() ) );
+
+            Versioning versioning = new Versioning();
+            versioning.setSnapshot( snapshot );
+            versioning.setLastUpdated( snapshot.getTimestamp().replace( ".", "" ) );
+            lastUpdated = versioning.getLastUpdated();
+
+            metadata.setVersioning( versioning );
+        }
+        else
+        {
+            snapshot = metadata.getVersioning().getSnapshot();
+            lastUpdated = metadata.getVersioning().getLastUpdated();
+        }
+
+        for ( Artifact artifact : artifacts )
+        {
+            String version = artifact.getVersion();
+
+            if ( version.endsWith( SNAPSHOT ) )
+            {
+                String qualifier = snapshot.getTimestamp() + "-" + snapshot.getBuildNumber();
+                version = version.substring( 0, version.length() - SNAPSHOT.length() ) + qualifier;
+            }
+
+            SnapshotVersion sv = new SnapshotVersion();
+            sv.setClassifier( artifact.getClassifier() );
+            sv.setVersion( version );
+            sv.setUpdated( lastUpdated );
+            versions.put( sv.getClassifier(), sv );
+        }
+
+        artifacts.clear();
+
+        Versioning versioning = recessive.getVersioning();
+        if ( versioning != null )
+        {
+            for ( SnapshotVersion sv : versioning.getSnapshotVersions() )
+            {
+                if ( !versions.containsKey( sv.getClassifier() ) )
+                {
+                    versions.put( sv.getClassifier(), sv );
+                }
+            }
+        }
+
+        metadata.getVersioning().setSnapshotVersions( new ArrayList<SnapshotVersion>( versions.values() ) );
+    }
+
+    private static int getBuildNumber( Metadata metadata )
+    {
+        int number = 0;
+
+        Versioning versioning = metadata.getVersioning();
+        if ( versioning != null )
+        {
+            Snapshot snapshot = versioning.getSnapshot();
+            if ( snapshot != null && snapshot.getBuildNumber() > 0 )
+            {
+                number = snapshot.getBuildNumber();
+            }
+        }
+
+        return number;
+    }
+
+    public String getGroupId()
+    {
+        return metadata.getGroupId();
+    }
+
+    public String getArtifactId()
+    {
+        return metadata.getArtifactId();
+    }
+
+    public String getVersion()
+    {
+        return metadata.getVersion();
+    }
+
+    public Nature getNature()
+    {
+        return Nature.SNAPSHOT;
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/RemoteSnapshotMetadataGenerator.java

@@ -0,0 +1,102 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.deployment.DeployRequest;
+import org.sonatype.aether.impl.MetadataGenerator;
+import org.sonatype.aether.metadata.Metadata;
+
+/**
+ * @author Benjamin Bentmann
+ */
+class RemoteSnapshotMetadataGenerator
+    implements MetadataGenerator
+{
+
+    private Map<Object, RemoteSnapshotMetadata> snapshots;
+
+    public RemoteSnapshotMetadataGenerator( RepositorySystemSession session, DeployRequest request )
+    {
+        snapshots = new LinkedHashMap<Object, RemoteSnapshotMetadata>();
+
+        /*
+         * NOTE: This should be considered a quirk to support interop with Maven's legacy ArtifactDeployer which
+         * processes one artifact at a time and hence cannot associate the artifacts from the same project to use the
+         * same timestamp+buildno for the snapshot versions. Allowing the caller to pass in metadata from a previous
+         * deployment allows to re-establish the association between the artifacts of the same project.
+         */
+        for ( Metadata metadata : request.getMetadata() )
+        {
+            if ( metadata instanceof RemoteSnapshotMetadata )
+            {
+                RemoteSnapshotMetadata snapshotMetadata = (RemoteSnapshotMetadata) metadata;
+                snapshots.put( snapshotMetadata.getKey(), snapshotMetadata );
+            }
+        }
+    }
+
+    public Collection<? extends Metadata> prepare( Collection<? extends Artifact> artifacts )
+    {
+        for ( Artifact artifact : artifacts )
+        {
+            if ( artifact.isSnapshot() )
+            {
+                Object key = RemoteSnapshotMetadata.getKey( artifact );
+                RemoteSnapshotMetadata snapshotMetadata = snapshots.get( key );
+                if ( snapshotMetadata == null )
+                {
+                    snapshotMetadata = new RemoteSnapshotMetadata( artifact );
+                    snapshots.put( key, snapshotMetadata );
+                }
+                snapshotMetadata.bind( artifact );
+            }
+        }
+
+        return snapshots.values();
+    }
+
+    public Artifact transformArtifact( Artifact artifact )
+    {
+        if ( artifact.isSnapshot() && artifact.getVersion().equals( artifact.getBaseVersion() ) )
+        {
+            Object key = RemoteSnapshotMetadata.getKey( artifact );
+            RemoteSnapshotMetadata snapshotMetadata = snapshots.get( key );
+            if ( snapshotMetadata != null )
+            {
+                artifact = artifact.setVersion( snapshotMetadata.getExpandedVersion( artifact ) );
+            }
+        }
+
+        return artifact;
+    }
+
+    public Collection<? extends Metadata> finish( Collection<? extends Artifact> artifacts )
+    {
+        return Collections.emptyList();
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/SnapshotMetadataGeneratorFactory.java

@@ -0,0 +1,52 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.deployment.DeployRequest;
+import org.sonatype.aether.impl.MetadataGenerator;
+import org.sonatype.aether.impl.MetadataGeneratorFactory;
+import org.sonatype.aether.installation.InstallRequest;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = MetadataGeneratorFactory.class, hint = "snapshot" )
+public class SnapshotMetadataGeneratorFactory
+    implements MetadataGeneratorFactory
+{
+
+    public MetadataGenerator newInstance( RepositorySystemSession session, InstallRequest request )
+    {
+        return new LocalSnapshotMetadataGenerator( session, request );
+    }
+
+    public MetadataGenerator newInstance( RepositorySystemSession session, DeployRequest request )
+    {
+        return new RemoteSnapshotMetadataGenerator( session, request );
+    }
+
+    public int getPriority()
+    {
+        return 10;
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/VersionsMetadata.java

@@ -0,0 +1,102 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+
+import org.apache.maven.artifact.repository.metadata.Metadata;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.sonatype.aether.artifact.Artifact;
+
+/**
+ * @author Benjamin Bentmann
+ */
+final class VersionsMetadata
+    extends MavenMetadata
+{
+
+    private final Artifact artifact;
+
+    public VersionsMetadata( Artifact artifact )
+    {
+        super( createMetadata( artifact ), null );
+        this.artifact = artifact;
+    }
+
+    public VersionsMetadata( Artifact artifact, File file )
+    {
+        super( createMetadata( artifact ), file );
+        this.artifact = artifact;
+    }
+
+    private static Metadata createMetadata( Artifact artifact )
+    {
+        Versioning versioning = new Versioning();
+        versioning.addVersion( artifact.getBaseVersion() );
+        if ( !artifact.isSnapshot() )
+        {
+            versioning.setRelease( artifact.getVersion() );
+        }
+
+        Metadata metadata = new Metadata();
+        metadata.setModelVersion( "1.0.0" );
+        metadata.setVersioning( versioning );
+        metadata.setGroupId( artifact.getGroupId() );
+        metadata.setArtifactId( artifact.getArtifactId() );
+
+        return metadata;
+    }
+
+    public Object getKey()
+    {
+        return getGroupId() + ':' + getArtifactId();
+    }
+
+    public static Object getKey( Artifact artifact )
+    {
+        return artifact.getGroupId() + ':' + artifact.getArtifactId();
+    }
+
+    public MavenMetadata setFile( File file )
+    {
+        return new VersionsMetadata( artifact, file );
+    }
+
+    public String getGroupId()
+    {
+        return artifact.getGroupId();
+    }
+
+    public String getArtifactId()
+    {
+        return artifact.getArtifactId();
+    }
+
+    public String getVersion()
+    {
+        return "";
+    }
+
+    public Nature getNature()
+    {
+        return artifact.isSnapshot() ? Nature.RELEASE_OR_SNAPSHOT : Nature.RELEASE;
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/VersionsMetadataGenerator.java

@@ -0,0 +1,99 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.deployment.DeployRequest;
+import org.sonatype.aether.impl.MetadataGenerator;
+import org.sonatype.aether.installation.InstallRequest;
+import org.sonatype.aether.metadata.Metadata;
+
+/**
+ * @author Benjamin Bentmann
+ */
+class VersionsMetadataGenerator
+    implements MetadataGenerator
+{
+
+    private Map<Object, VersionsMetadata> versions;
+
+    public VersionsMetadataGenerator( RepositorySystemSession session, InstallRequest request )
+    {
+        this( session, request.getMetadata() );
+    }
+
+    public VersionsMetadataGenerator( RepositorySystemSession session, DeployRequest request )
+    {
+        this( session, request.getMetadata() );
+    }
+
+    private VersionsMetadataGenerator( RepositorySystemSession session, Collection<? extends Metadata> metadatas )
+    {
+        versions = new LinkedHashMap<Object, VersionsMetadata>();
+
+        /*
+         * NOTE: This should be considered a quirk to support interop with Maven's legacy ArtifactDeployer which
+         * processes one artifact at a time and hence cannot associate the artifacts from the same project to use the
+         * same timestamp+buildno for the snapshot versions. Allowing the caller to pass in metadata from a previous
+         * deployment allows to re-establish the association between the artifacts of the same project.
+         */
+        for ( Metadata metadata : metadatas )
+        {
+            if ( metadata instanceof VersionsMetadata )
+            {
+                VersionsMetadata versionsMetadata = (VersionsMetadata) metadata;
+                versions.put( versionsMetadata.getKey(), versionsMetadata );
+            }
+        }
+    }
+
+    public Collection<? extends Metadata> prepare( Collection<? extends Artifact> artifacts )
+    {
+        return Collections.emptyList();
+    }
+
+    public Artifact transformArtifact( Artifact artifact )
+    {
+        return artifact;
+    }
+
+    public Collection<? extends Metadata> finish( Collection<? extends Artifact> artifacts )
+    {
+        for ( Artifact artifact : artifacts )
+        {
+            Object key = VersionsMetadata.getKey( artifact );
+            VersionsMetadata versionsMetadata = versions.get( key );
+            if ( versionsMetadata == null )
+            {
+                versionsMetadata = new VersionsMetadata( artifact );
+                versions.put( key, versionsMetadata );
+            }
+        }
+
+        return versions.values();
+    }
+
+}

maven-aether-provider/src/main/java/org/apache/maven/repository/internal/VersionsMetadataGeneratorFactory.java

@@ -0,0 +1,52 @@
+package org.apache.maven.repository.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.deployment.DeployRequest;
+import org.sonatype.aether.impl.MetadataGenerator;
+import org.sonatype.aether.impl.MetadataGeneratorFactory;
+import org.sonatype.aether.installation.InstallRequest;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = MetadataGeneratorFactory.class, hint = "versions" )
+public class VersionsMetadataGeneratorFactory
+    implements MetadataGeneratorFactory
+{
+
+    public MetadataGenerator newInstance( RepositorySystemSession session, InstallRequest request )
+    {
+        return new VersionsMetadataGenerator( session, request );
+    }
+
+    public MetadataGenerator newInstance( RepositorySystemSession session, DeployRequest request )
+    {
+        return new VersionsMetadataGenerator( session, request );
+    }
+
+    public int getPriority()
+    {
+        return 5;
+    }
+
+}

maven-artifact/src/main/java/org/apache/maven/artifact/DefaultArtifact.java

@@ -493,7 +493,6 @@ public class DefaultArtifact
     public void setVersionRange( VersionRange versionRange )
     {
         this.versionRange = versionRange;
-
         selectVersionFromNewRangeIfAvailable();
     }
 

maven-compat/pom.xml

@@ -69,6 +69,12 @@
       <artifactId>wagon-file</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-connector-wagon</artifactId>
+      <version>${aetherVersion}</version>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>easymock</groupId>
       <artifactId>easymock</artifactId>

maven-compat/src/main/java/org/apache/maven/artifact/deployer/DefaultArtifactDeployer.java

@@ -20,50 +20,46 @@ package org.apache.maven.artifact.deployer;
  */
 
 import java.io.File;
-import java.io.IOException;
-import java.util.Arrays;
-import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.metadata.ArtifactMetadata;
 import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.repository.DefaultArtifactRepository;
-import org.apache.maven.artifact.repository.metadata.RepositoryMetadataDeploymentException;
-import org.apache.maven.artifact.repository.metadata.RepositoryMetadataManager;
-import org.apache.maven.execution.MavenExecutionRequest;
-import org.apache.maven.execution.MavenSession;
+import org.apache.maven.artifact.repository.metadata.ArtifactRepositoryMetadata;
+import org.apache.maven.artifact.repository.metadata.MetadataBridge;
+import org.apache.maven.artifact.repository.metadata.SnapshotArtifactRepositoryMetadata;
 import org.apache.maven.plugin.LegacySupport;
-import org.apache.maven.repository.RepositorySystem;
-import org.apache.maven.repository.legacy.TransferListenerAdapter;
-import org.apache.maven.repository.legacy.WagonManager;
-import org.apache.maven.repository.legacy.resolver.transform.ArtifactTransformationManager;
-import org.apache.maven.wagon.TransferFailedException;
-import org.apache.maven.wagon.events.TransferListener;
+import org.apache.maven.project.artifact.ProjectArtifactMetadata;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.AbstractLogEnabled;
-import org.codehaus.plexus.util.FileUtils;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.deployment.DeployRequest;
+import org.sonatype.aether.deployment.DeployResult;
+import org.sonatype.aether.deployment.DeploymentException;
+import org.sonatype.aether.metadata.MergeableMetadata;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.artifact.SubArtifact;
 
-@Component( role = ArtifactDeployer.class )
+@Component( role = ArtifactDeployer.class, instantiationStrategy = "per-lookup" )
 public class DefaultArtifactDeployer
     extends AbstractLogEnabled
     implements ArtifactDeployer
 {
-    @Requirement
-    private WagonManager wagonManager;
 
     @Requirement
-    private ArtifactTransformationManager transformationManager;
-
-    @Requirement
-    private RepositoryMetadataManager repositoryMetadataManager;
-
-    @Requirement
-    private RepositorySystem repositorySystem;
+    private RepositorySystem repoSystem;
 
     @Requirement
     private LegacySupport legacySupport;
 
+    private Map<Object, MergeableMetadata> snapshots = new ConcurrentHashMap<Object, MergeableMetadata>();
+
     /**
      * @deprecated we want to use the artifact method only, and ensure artifact.file is set
      *             correctly.
@@ -82,79 +78,78 @@ public class DefaultArtifactDeployer
                         ArtifactRepository localRepository )
         throws ArtifactDeploymentException
     {
-        deploymentRepository = injectSession( deploymentRepository );
+        DefaultRepositorySystemSession session =
+            new DefaultRepositorySystemSession( legacySupport.getRepositorySession() );
+        LocalRepository localRepo = new LocalRepository( localRepository.getBasedir() );
+        session.setLocalRepositoryManager( repoSystem.newLocalRepositoryManager( localRepo ) );
 
-        try
-        {
-            transformationManager.transformForDeployment( artifact, deploymentRepository, localRepository );
+        DeployRequest request = new DeployRequest();
 
-            // Copy the original file to the new one if it was transformed
-            File artifactFile = new File( localRepository.getBasedir(), localRepository.pathOf( artifact ) );
-            if ( !artifactFile.equals( source ) )
+        org.sonatype.aether.artifact.Artifact mainArtifact = RepositoryUtils.toArtifact( artifact );
+        mainArtifact = mainArtifact.setFile( source );
+        request.addArtifact( mainArtifact );
+
+        String snapshotKey = null;
+        if ( artifact.isSnapshot() )
         {
-                FileUtils.copyFile( source, artifactFile );
+            snapshotKey = artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
+            request.addMetadata( snapshots.get( snapshotKey ) );
         }
 
-            wagonManager.putArtifact( source, artifact, deploymentRepository, getTransferListener() );
-
-            // must be after the artifact is installed
         for ( ArtifactMetadata metadata : artifact.getMetadataList() )
         {
-                repositoryMetadataManager.deploy( metadata, localRepository, deploymentRepository );
-            }
-        }
-        catch ( TransferFailedException e )
+            if ( metadata instanceof ProjectArtifactMetadata )
             {
-            throw new ArtifactDeploymentException( "Error deploying artifact: " + e.getMessage(), e );
+                org.sonatype.aether.artifact.Artifact pomArtifact = new SubArtifact( mainArtifact, "", "pom" );
+                pomArtifact = pomArtifact.setFile( ( (ProjectArtifactMetadata) metadata ).getFile() );
+                request.addArtifact( pomArtifact );
             }
-        catch ( IOException e )
+            else if ( metadata instanceof SnapshotArtifactRepositoryMetadata
+                || metadata instanceof ArtifactRepositoryMetadata )
             {
-            throw new ArtifactDeploymentException( "Error deploying artifact: " + e.getMessage(), e );
+                // eaten, handled by repo system
             }
-        catch ( RepositoryMetadataDeploymentException e )
+            else
             {
-            throw new ArtifactDeploymentException( "Error installing artifact's metadata: " + e.getMessage(), e );
+                request.addMetadata( new MetadataBridge( metadata ) );
             }
         }
 
-    private TransferListener getTransferListener()
-    {
-        MavenSession session = legacySupport.getSession();
-
-        if ( session == null )
-        {
-            return null;
-        }
-
-        return TransferListenerAdapter.newAdapter( session.getRequest().getTransferListener() );
-    }
-
-    private ArtifactRepository injectSession( ArtifactRepository repository )
-    {
+        RemoteRepository remoteRepo = RepositoryUtils.toRepo( deploymentRepository );
         /*
          * NOTE: This provides backward-compat with maven-deploy-plugin:2.4 which bypasses the repository factory when
          * using an alternative deployment location.
          */
-        if ( repository instanceof DefaultArtifactRepository && repository.getAuthentication() == null )
+        if ( deploymentRepository instanceof DefaultArtifactRepository
+            && deploymentRepository.getAuthentication() == null )
         {
-            MavenSession session = legacySupport.getSession();
+            remoteRepo.setAuthentication( session.getAuthenticationSelector().getAuthentication( remoteRepo ) );
+            remoteRepo.setProxy( session.getProxySelector().getProxy( remoteRepo ) );
+        }
+        request.setRepository( remoteRepo );
 
-            if ( session != null )
+        DeployResult result;
+        try
         {
-                MavenExecutionRequest request = session.getRequest();
-
-                if ( request != null )
+            result = repoSystem.deploy( session, request );
+        }
+        catch ( DeploymentException e )
         {
-                    List<ArtifactRepository> repositories = Arrays.asList( repository );
+            throw new ArtifactDeploymentException( e.getMessage(), e );
+        }
 
-                    repositorySystem.injectProxy( repositories, request.getProxies() );
-
-                    repositorySystem.injectAuthentication( repositories, request.getServers() );
+        if ( snapshotKey != null )
+        {
+            for ( Object metadata : result.getMetadata() )
+            {
+                if ( metadata.getClass().getName().endsWith( ".internal.RemoteSnapshotMetadata" ) )
+                {
+                    snapshots.put( snapshotKey, (MergeableMetadata) metadata );
                 }
             }
         }
 
-        return repository;
+        artifact.setResolvedVersion( result.getArtifacts().iterator().next().getVersion() );
     }
 
 }

maven-compat/src/main/java/org/apache/maven/artifact/installer/DefaultArtifactInstaller.java

@@ -20,21 +20,27 @@ package org.apache.maven.artifact.installer;
  */
 
 import java.io.File;
-import java.io.IOException;
 
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.metadata.ArtifactMetadata;
 import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.metadata.RepositoryMetadataInstallationException;
-import org.apache.maven.artifact.repository.metadata.RepositoryMetadataManager;
-import org.apache.maven.repository.DefaultLocalRepositoryMaintainerEvent;
-import org.apache.maven.repository.LocalRepositoryMaintainer;
-import org.apache.maven.repository.LocalRepositoryMaintainerEvent;
-import org.apache.maven.repository.legacy.resolver.transform.ArtifactTransformationManager;
+import org.apache.maven.artifact.repository.metadata.ArtifactRepositoryMetadata;
+import org.apache.maven.artifact.repository.metadata.MetadataBridge;
+import org.apache.maven.artifact.repository.metadata.Snapshot;
+import org.apache.maven.artifact.repository.metadata.SnapshotArtifactRepositoryMetadata;
+import org.apache.maven.artifact.repository.metadata.Versioning;
+import org.apache.maven.plugin.LegacySupport;
+import org.apache.maven.project.artifact.ProjectArtifactMetadata;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.AbstractLogEnabled;
-import org.codehaus.plexus.util.FileUtils;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.installation.InstallRequest;
+import org.sonatype.aether.installation.InstallationException;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.artifact.SubArtifact;
 
 /**
  * @author Jason van Zyl
@@ -44,14 +50,12 @@ public class DefaultArtifactInstaller
     extends AbstractLogEnabled
     implements ArtifactInstaller
 {
-    @Requirement
-    private ArtifactTransformationManager transformationManager;
 
     @Requirement
-    private RepositoryMetadataManager repositoryMetadataManager;
+    private RepositorySystem repoSystem;
     
-    @Requirement( optional = true )
-    private LocalRepositoryMaintainer localRepositoryMaintainer;
+    @Requirement
+    private LegacySupport legacySupport;
     
     /** @deprecated we want to use the artifact method only, and ensure artifact.file is set correctly. */
     @Deprecated
@@ -67,59 +71,64 @@ public class DefaultArtifactInstaller
     public void install( File source, Artifact artifact, ArtifactRepository localRepository )
         throws ArtifactInstallationException
     {
-        try
-        {
-            transformationManager.transformForInstall( artifact, localRepository );
+        DefaultRepositorySystemSession session =
+            new DefaultRepositorySystemSession( legacySupport.getRepositorySession() );
+        LocalRepository localRepo = new LocalRepository( localRepository.getBasedir() );
+        session.setLocalRepositoryManager( repoSystem.newLocalRepositoryManager( localRepo ) );
 
-            String localPath = localRepository.pathOf( artifact );
+        InstallRequest request = new InstallRequest();
 
-            // TODO: use a file: wagon and the wagon manager?
-            File destination = new File( localRepository.getBasedir(), localPath );
-            if ( !destination.getParentFile().exists() )
+        org.sonatype.aether.artifact.Artifact mainArtifact = RepositoryUtils.toArtifact( artifact );
+        mainArtifact = mainArtifact.setFile( source );
+        request.addArtifact( mainArtifact );
+
+        for ( ArtifactMetadata metadata : artifact.getMetadataList() )
         {
-                destination.getParentFile().mkdirs();
+            if ( metadata instanceof ProjectArtifactMetadata )
+            {
+                org.sonatype.aether.artifact.Artifact pomArtifact = new SubArtifact( mainArtifact, "", "pom" );
+                pomArtifact = pomArtifact.setFile( ( (ProjectArtifactMetadata) metadata ).getFile() );
+                request.addArtifact( pomArtifact );
             }
-
-            boolean copy =
-                !destination.exists() || "pom".equals( artifact.getType() )
-                    || source.lastModified() != destination.lastModified() || source.length() != destination.length();
-
-            if ( copy )
+            else if ( metadata instanceof SnapshotArtifactRepositoryMetadata
+                || metadata instanceof ArtifactRepositoryMetadata )
             {
-                getLogger().info( "Installing " + source + " to " + destination );
-
-                FileUtils.copyFile( source, destination );
-                destination.setLastModified( source.lastModified() );
+                // eaten, handled by repo system
             }
             else
             {
-                getLogger().info( "Skipped re-installing " + source + " to " + destination + ", seems unchanged" );
+                request.addMetadata( new MetadataBridge( metadata ) );
+            }
         }
 
-            // must be after the artifact is installed
-            for ( ArtifactMetadata metadata : artifact.getMetadataList() )
+        try
         {
-                repositoryMetadataManager.install( metadata, localRepository );
+            repoSystem.install( session, request );
+        }
+        catch ( InstallationException e )
+        {
+            throw new ArtifactInstallationException( e.getMessage(), e );
         }
-            // TODO: would like to flush this, but the plugin metadata is added in advance, not as an install/deploy
-            // transformation
-            // This would avoid the need to merge and clear out the state during deployment
-            // artifact.getMetadataList().clear();
 
-            if ( localRepositoryMaintainer != null )
+        /*
+         * NOTE: Not used by Maven core, only here to provide backward-compat with plugins like the Install Plugin.
+         */
+
+        if ( artifact.isSnapshot() )
         {
-                LocalRepositoryMaintainerEvent event =
-                    new DefaultLocalRepositoryMaintainerEvent( localRepository, artifact, destination );
-                localRepositoryMaintainer.artifactInstalled( event );
+            Snapshot snapshot = new Snapshot();
+            snapshot.setLocalCopy( true );
+            artifact.addMetadata( new SnapshotArtifactRepositoryMetadata( artifact, snapshot ) );
         }
-        }
-        catch ( IOException e )
+
+        Versioning versioning = new Versioning();
+        versioning.updateTimestamp();
+        versioning.addVersion( artifact.getBaseVersion() );
+        if ( artifact.isRelease() )
         {
-            throw new ArtifactInstallationException( "Error installing artifact: " + e.getMessage(), e );
-        }
-        catch ( RepositoryMetadataInstallationException e )
-        {
-            throw new ArtifactInstallationException( "Error installing artifact's metadata: " + e.getMessage(), e );
+            versioning.setRelease( artifact.getBaseVersion() );
         }
+        artifact.addMetadata( new ArtifactRepositoryMetadata( artifact, versioning ) );
     }
+
 }

maven-compat/src/main/java/org/apache/maven/artifact/repository/metadata/DefaultRepositoryMetadataManager.java

@@ -22,7 +22,6 @@ import java.io.Reader;
 import java.io.Writer;
 import java.util.Date;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
@@ -30,7 +29,6 @@ import org.apache.maven.artifact.metadata.ArtifactMetadata;
 import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
 import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
-import org.apache.maven.artifact.repository.RepositoryCache;
 import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Reader;
 import org.apache.maven.artifact.repository.metadata.io.xpp3.MetadataXpp3Writer;
@@ -60,8 +58,7 @@ public class DefaultRepositoryMetadataManager
     @Requirement
     private UpdateCheckManager updateCheckManager;
 
-    public void resolve( RepositoryMetadata metadata, List<ArtifactRepository> remoteRepositories,
-                         ArtifactRepository localRepository )
+    public void resolve( RepositoryMetadata metadata, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository )
         throws RepositoryMetadataResolutionException
     {
         RepositoryRequest request = new DefaultRepositoryRequest();
@@ -73,41 +70,6 @@ public class DefaultRepositoryMetadataManager
     public void resolve( RepositoryMetadata metadata, RepositoryRequest request )
         throws RepositoryMetadataResolutionException
     {
-        RepositoryCache cache = request.getCache();
-
-        CacheKey cacheKey = null;
-
-        if ( cache != null )
-        {
-            cacheKey = new CacheKey( metadata, request );
-
-            CacheRecord cacheRecord = (CacheRecord) cache.get( request, cacheKey );
-
-            if ( cacheRecord != null )
-            {
-                if ( getLogger().isDebugEnabled() )
-                {
-                    getLogger().debug( "Resolved metadata from cache: " + metadata + " @ " + cacheRecord.repository );
-                }
-
-                metadata.setMetadata( MetadataUtils.cloneMetadata( cacheRecord.metadata ) );
-
-                if ( cacheRecord.repository != null )
-                {
-                    for ( ArtifactRepository repository : request.getRemoteRepositories() )
-                    {
-                        if ( cacheRecord.repository.equals( repository.getId() ) )
-                        {
-                            metadata.setRepository( repository );
-                            break;
-                        }
-                    }
-                }
-
-                return;
-            }
-        }
-
         ArtifactRepository localRepository = request.getLocalRepository();
         List<ArtifactRepository> remoteRepositories = request.getRemoteRepositories();
 
@@ -209,13 +171,7 @@ public class DefaultRepositoryMetadataManager
         }
         catch ( RepositoryMetadataStoreException e )
         {
-            throw new RepositoryMetadataResolutionException( "Unable to store local copy of metadata: "
-                + e.getMessage(), e );
-        }
-
-        if ( cache != null )
-        {
-            cache.put( request, cacheKey, new CacheRecord( metadata ) );
+            throw new RepositoryMetadataResolutionException( "Unable to store local copy of metadata: " + e.getMessage(), e );
         }
     }
 
@@ -226,130 +182,7 @@ public class DefaultRepositoryMetadataManager
         return metadataFile.isFile() ? new Date( metadataFile.lastModified() ) : null;
     }
 
-    private static final class CacheKey
-    {
-
-        final Object metadataKey;
-
-        final ArtifactRepository localRepository;
-
-        final List<ArtifactRepository> remoteRepositories;
-
-        final int hashCode;
-
-        CacheKey( RepositoryMetadata metadata, RepositoryRequest request )
-        {
-            metadataKey = metadata.getKey();
-            localRepository = request.getLocalRepository();
-            remoteRepositories = request.getRemoteRepositories();
-
-            int hash = 17;
-            hash = hash * 31 + metadata.getKey().hashCode();
-            hash = hash * 31 + repoHashCode( localRepository );
-            for ( ArtifactRepository remoteRepository : remoteRepositories )
-            {
-                hash = hash * 31 + repoHashCode( remoteRepository );
-            }
-            hashCode = hash;
-        }
-
-        int repoHashCode( ArtifactRepository repository )
-        {
-            return ( repository != null && repository.getUrl() != null ) ? repository.getUrl().hashCode() : 0;
-        }
-
-        boolean repoEquals( ArtifactRepository repo1, ArtifactRepository repo2 )
-        {
-            if ( repo1 == repo2 )
-            {
-                return true;
-            }
-
-            if ( repo1 == null || repo2 == null )
-            {
-                return false;
-            }
-
-            return equal( repo1.getUrl(), repo2.getUrl() ) && repo1.getClass() == repo2.getClass();
-        }
-
-        private static <T> boolean equal( T s1, T s2 )
-        {
-            return s1 != null ? s1.equals( s2 ) : s2 == null;
-        }
-
-        @Override
-        public boolean equals( Object obj )
-        {
-            if ( this == obj )
-            {
-                return true;
-            }
-
-            if ( !( obj instanceof CacheKey ) )
-            {
-                return false;
-            }
-
-            CacheKey that = (CacheKey) obj;
-
-            if ( !this.metadataKey.equals( that.metadataKey ) )
-            {
-                return false;
-            }
-
-            if ( !repoEquals( this.localRepository, that.localRepository ) )
-            {
-                return false;
-            }
-
-            for ( Iterator<ArtifactRepository> it1 = this.remoteRepositories.iterator(), it2 =
-                that.remoteRepositories.iterator();; )
-            {
-                if ( !it1.hasNext() || !it2.hasNext() )
-                {
-                    if ( it1.hasNext() != it2.hasNext() )
-                    {
-                        return false;
-                    }
-                    break;
-                }
-                ArtifactRepository repo1 = it1.next();
-                ArtifactRepository repo2 = it2.next();
-                if ( !repoEquals( repo1, repo2 ) )
-                {
-                    return false;
-                }
-            }
-
-            return true;
-        }
-
-        @Override
-        public int hashCode()
-        {
-            return hashCode;
-        }
-
-    }
-
-    private static final class CacheRecord
-    {
-
-        final Metadata metadata;
-
-        final String repository;
-
-        CacheRecord( RepositoryMetadata metadata )
-        {
-            this.metadata = MetadataUtils.cloneMetadata( metadata.getMetadata() );
-            this.repository = ( metadata.getRepository() != null ) ? metadata.getRepository().getId() : null;
-        }
-
-    }
-
-    private void mergeMetadata( RepositoryMetadata metadata, List<ArtifactRepository> remoteRepositories,
-                                ArtifactRepository localRepository )
+    private void mergeMetadata( RepositoryMetadata metadata, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository )
         throws RepositoryMetadataStoreException
     {
         // TODO: currently this is first wins, but really we should take the latest by comparing either the
@@ -378,9 +211,7 @@ public class DefaultRepositoryMetadataManager
         updateSnapshotMetadata( metadata, previousMetadata, selected, localRepository );
     }
 
-    private void updateSnapshotMetadata( RepositoryMetadata metadata,
-                                         Map<ArtifactRepository, Metadata> previousMetadata,
-                                         ArtifactRepository selected, ArtifactRepository localRepository )
+    private void updateSnapshotMetadata( RepositoryMetadata metadata, Map<ArtifactRepository, Metadata> previousMetadata, ArtifactRepository selected, ArtifactRepository localRepository )
         throws RepositoryMetadataStoreException
     {
         // TODO: this could be a lot nicer... should really be in the snapshot transformation?
@@ -405,8 +236,7 @@ public class DefaultRepositoryMetadataManager
                 }
                 else
                 {
-                    if ( ( m.getVersioning() != null ) && ( m.getVersioning().getSnapshot() != null )
-                        && m.getVersioning().getSnapshot().isLocalCopy() )
+                    if ( ( m.getVersioning() != null ) && ( m.getVersioning().getSnapshot() != null ) && m.getVersioning().getSnapshot().isLocalCopy() )
                     {
                         m.getVersioning().getSnapshot().setLocalCopy( false );
                         metadata.setMetadata( m );
@@ -419,14 +249,11 @@ public class DefaultRepositoryMetadataManager
         }
     }
 
-    private boolean loadMetadata( RepositoryMetadata repoMetadata, ArtifactRepository remoteRepository,
-                                  ArtifactRepository localRepository, Map<ArtifactRepository, Metadata> previousMetadata )
+    private boolean loadMetadata( RepositoryMetadata repoMetadata, ArtifactRepository remoteRepository, ArtifactRepository localRepository, Map<ArtifactRepository, Metadata> previousMetadata )
     {
         boolean setRepository = false;
 
-        File metadataFile =
-            new File( localRepository.getBasedir(), localRepository.pathOfLocalRepositoryMetadata( repoMetadata,
-                                                                                                   remoteRepository ) );
+        File metadataFile = new File( localRepository.getBasedir(), localRepository.pathOfLocalRepositoryMetadata( repoMetadata, remoteRepository ) );
 
         if ( metadataFile.exists() )
         {
@@ -488,13 +315,11 @@ public class DefaultRepositoryMetadataManager
         }
         catch ( IOException e )
         {
-            throw new RepositoryMetadataReadException( "Cannot read metadata from '" + mappingFile + "': "
-                + e.getMessage(), e );
+            throw new RepositoryMetadataReadException( "Cannot read metadata from '" + mappingFile + "': " + e.getMessage(), e );
         }
         catch ( XmlPullParserException e )
         {
-            throw new RepositoryMetadataReadException( "Cannot read metadata from '" + mappingFile + "': "
-                + e.getMessage(), e );
+            throw new RepositoryMetadataReadException( "Cannot read metadata from '" + mappingFile + "': " + e.getMessage(), e );
         }
         finally
         {
@@ -505,8 +330,8 @@ public class DefaultRepositoryMetadataManager
     }
 
     /**
-     * Ensures the last updated timestamp of the specified metadata does not refer to the future and fixes the local
-     * metadata if necessary to allow proper merging/updating of metadata during deployment.
+     * Ensures the last updated timestamp of the specified metadata does not refer to the future and fixes the local metadata if necessary to allow
+     * proper merging/updating of metadata during deployment.
      */
     private void fixTimestamp( File metadataFile, Metadata metadata, Metadata reference )
     {
@@ -562,8 +387,7 @@ public class DefaultRepositoryMetadataManager
         }
     }
 
-    public void resolveAlways( RepositoryMetadata metadata, ArtifactRepository localRepository,
-                               ArtifactRepository remoteRepository )
+    public void resolveAlways( RepositoryMetadata metadata, ArtifactRepository localRepository, ArtifactRepository remoteRepository )
         throws RepositoryMetadataResolutionException
     {
         File file;
@@ -573,8 +397,7 @@ public class DefaultRepositoryMetadataManager
         }
         catch ( TransferFailedException e )
         {
-            throw new RepositoryMetadataResolutionException( metadata + " could not be retrieved from repository: "
-                + remoteRepository.getId() + " due to an error: " + e.getMessage(), e );
+            throw new RepositoryMetadataResolutionException( metadata + " could not be retrieved from repository: " + remoteRepository.getId() + " due to an error: " + e.getMessage(), e );
         }
 
         try
@@ -591,24 +414,18 @@ public class DefaultRepositoryMetadataManager
         }
     }
 
-    private File getArtifactMetadataFromDeploymentRepository( ArtifactMetadata metadata,
-                                                              ArtifactRepository localRepository,
-                                                              ArtifactRepository remoteRepository )
+    private File getArtifactMetadataFromDeploymentRepository( ArtifactMetadata metadata, ArtifactRepository localRepository, ArtifactRepository remoteRepository )
         throws TransferFailedException
     {
-        File file =
-            new File( localRepository.getBasedir(), localRepository.pathOfLocalRepositoryMetadata( metadata,
-                                                                                                   remoteRepository ) );
+        File file = new File( localRepository.getBasedir(), localRepository.pathOfLocalRepositoryMetadata( metadata, remoteRepository ) );
 
         try
         {
-            wagonManager.getArtifactMetadataFromDeploymentRepository( metadata, remoteRepository, file,
-                                                                      ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN );
+            wagonManager.getArtifactMetadataFromDeploymentRepository( metadata, remoteRepository, file, ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN );
         }
         catch ( ResourceDoesNotExistException e )
         {
-            getLogger().info( metadata + " could not be found on repository: " + remoteRepository.getId()
-                                  + ", so will be created" );
+            getLogger().info( metadata + " could not be found on repository: " + remoteRepository.getId() + ", so will be created" );
 
             // delete the local copy so the old details aren't used.
             if ( file.exists() )
@@ -626,8 +443,7 @@ public class DefaultRepositoryMetadataManager
         return file;
     }
 
-    public void deploy( ArtifactMetadata metadata, ArtifactRepository localRepository,
-                        ArtifactRepository deploymentRepository )
+    public void deploy( ArtifactMetadata metadata, ArtifactRepository localRepository, ArtifactRepository deploymentRepository )
         throws RepositoryMetadataDeploymentException
     {
         File file;
@@ -640,8 +456,7 @@ public class DefaultRepositoryMetadataManager
             }
             catch ( TransferFailedException e )
             {
-                throw new RepositoryMetadataDeploymentException( metadata + " could not be retrieved from repository: "
-                    + deploymentRepository.getId() + " due to an error: " + e.getMessage(), e );
+                throw new RepositoryMetadataDeploymentException( metadata + " could not be retrieved from repository: " + deploymentRepository.getId() + " due to an error: " + e.getMessage(), e );
             }
 
             if ( file.isFile() )
@@ -659,9 +474,7 @@ public class DefaultRepositoryMetadataManager
         else
         {
             // It's a POM - we don't need to retrieve it first
-            file =
-                new File( localRepository.getBasedir(),
-                          localRepository.pathOfLocalRepositoryMetadata( metadata, deploymentRepository ) );
+            file = new File( localRepository.getBasedir(), localRepository.pathOfLocalRepositoryMetadata( metadata, deploymentRepository ) );
         }
 
         try

maven-compat/src/main/java/org/apache/maven/artifact/repository/metadata/MetadataBridge.java

@@ -0,0 +1,157 @@
+package org.apache.maven.artifact.repository.metadata;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+
+import org.apache.maven.artifact.metadata.ArtifactMetadata;
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.artifact.repository.DefaultArtifactRepository;
+import org.apache.maven.artifact.repository.metadata.RepositoryMetadata;
+import org.codehaus.plexus.util.FileUtils;
+import org.sonatype.aether.RepositoryException;
+import org.sonatype.aether.metadata.MergeableMetadata;
+
+/**
+ * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
+ * of the public API. In particular, this class can be changed or deleted without prior notice.
+ * 
+ * @author Benjamin Bentmann
+ */
+public final class MetadataBridge
+    implements MergeableMetadata
+{
+
+    private ArtifactMetadata metadata;
+
+    private boolean merged;
+
+    public MetadataBridge( ArtifactMetadata metadata )
+    {
+        this.metadata = metadata;
+    }
+
+    public void merge( File current, File result )
+        throws RepositoryException
+    {
+        try
+        {
+            if ( current.exists() )
+            {
+                FileUtils.copyFile( current, result );
+            }
+            ArtifactRepository localRepo = new MetadataRepository( result );
+            metadata.storeInLocalRepository( localRepo, localRepo );
+            merged = true;
+        }
+        catch ( Exception e )
+        {
+            throw new RepositoryException( e.getMessage(), e );
+        }
+    }
+
+    public boolean isMerged()
+    {
+        return merged;
+    }
+
+    public String getGroupId()
+    {
+        return emptify( metadata.getGroupId() );
+    }
+
+    public String getArtifactId()
+    {
+        return metadata.storedInGroupDirectory() ? "" : emptify( metadata.getArtifactId() );
+    }
+
+    public String getVersion()
+    {
+        return metadata.storedInArtifactVersionDirectory() ? emptify( metadata.getBaseVersion() ) : "";
+    }
+
+    public String getType()
+    {
+        return metadata.getRemoteFilename();
+    }
+
+    private String emptify( String string )
+    {
+        return ( string != null ) ? string : "";
+    }
+
+    public File getFile()
+    {
+        return null;
+    }
+
+    public MetadataBridge setFile( File file )
+    {
+        return this;
+    }
+
+    public Nature getNature()
+    {
+        if ( metadata instanceof RepositoryMetadata )
+        {
+            switch ( ( (RepositoryMetadata) metadata ).getNature() )
+            {
+                case RepositoryMetadata.RELEASE_OR_SNAPSHOT:
+                    return Nature.RELEASE_OR_SNAPSHOT;
+                case RepositoryMetadata.SNAPSHOT:
+                    return Nature.SNAPSHOT;
+                default:
+                    return Nature.RELEASE;
+            }
+        }
+        else
+        {
+            return Nature.RELEASE;
+        }
+    }
+
+    @SuppressWarnings( "deprecation" )
+    static class MetadataRepository
+        extends DefaultArtifactRepository
+    {
+
+        private File metadataFile;
+
+        public MetadataRepository( File metadataFile )
+        {
+            super( "local", "", null );
+            this.metadataFile = metadataFile;
+        }
+
+        @Override
+        public String getBasedir()
+        {
+            return metadataFile.getParent();
+        }
+
+        @Override
+        public String pathOfLocalRepositoryMetadata( ArtifactMetadata metadata, ArtifactRepository repository )
+        {
+            return metadataFile.getName();
+        }
+
+    }
+
+}

maven-compat/src/main/java/org/apache/maven/artifact/resolver/DefaultArtifactResolver.java

@@ -1,26 +1,21 @@
 package org.apache.maven.artifact.resolver;
 
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  * 
  * http://www.apache.org/licenses/LICENSE-2.0
  * 
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
 
 import java.io.File;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.LinkedHashMap;
@@ -37,40 +32,32 @@ import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.factory.ArtifactFactory;
 import org.apache.maven.artifact.metadata.ArtifactMetadataRetrievalException;
 import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
 import org.apache.maven.artifact.metadata.ResolutionGroup;
 import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
 import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.repository.metadata.Metadata;
-import org.apache.maven.artifact.repository.metadata.Snapshot;
-import org.apache.maven.artifact.repository.metadata.SnapshotArtifactRepositoryMetadata;
-import org.apache.maven.artifact.repository.metadata.Versioning;
 import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.plugin.LegacySupport;
-import org.apache.maven.repository.DefaultLocalRepositoryMaintainerEvent;
-import org.apache.maven.repository.LocalRepositoryMaintainer;
-import org.apache.maven.repository.LocalRepositoryMaintainerEvent;
-import org.apache.maven.repository.legacy.TransferListenerAdapter;
-import org.apache.maven.repository.legacy.WagonManager;
-import org.apache.maven.repository.legacy.metadata.ArtifactMetadata;
 import org.apache.maven.repository.legacy.metadata.DefaultMetadataResolutionRequest;
 import org.apache.maven.repository.legacy.metadata.MetadataResolutionRequest;
 import org.apache.maven.repository.legacy.resolver.conflict.ConflictResolver;
-import org.apache.maven.repository.legacy.resolver.transform.ArtifactTransformationManager;
-import org.apache.maven.wagon.ResourceDoesNotExistException;
-import org.apache.maven.wagon.TransferFailedException;
 import org.apache.maven.wagon.events.TransferListener;
 import org.codehaus.plexus.PlexusContainer;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
 import org.codehaus.plexus.logging.Logger;
-import org.codehaus.plexus.util.FileUtils;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.resolution.ArtifactRequest;
+import org.sonatype.aether.resolution.ArtifactResult;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
 
 /**
  * @author Jason van Zyl
@@ -82,12 +69,6 @@ public class DefaultArtifactResolver
     @Requirement 
     private Logger logger;
 
-    @Requirement
-    private WagonManager wagonManager;
-
-    @Requirement
-    private ArtifactTransformationManager transformationManager;
-
     @Requirement
     protected ArtifactFactory artifactFactory;
 
@@ -103,12 +84,12 @@ public class DefaultArtifactResolver
     @Requirement
     private PlexusContainer container;
 
-    @Requirement( optional = true )
-    private LocalRepositoryMaintainer localRepositoryMaintainer;
-
     @Requirement
     private LegacySupport legacySupport;
 
+    @Requirement
+    private RepositorySystem repoSystem;
+
     private final Executor executor;
 
     public DefaultArtifactResolver()
@@ -141,13 +122,32 @@ public class DefaultArtifactResolver
         }
     }
 
+    private RepositorySystemSession getSession( ArtifactRepository localRepository )
+    {
+        MavenSession mavenSession = legacySupport.getSession();
+        DefaultRepositorySystemSession session;
+        if ( mavenSession != null )
+        {
+            session = new DefaultRepositorySystemSession( mavenSession.getRepositorySession() );
+        }
+        else
+        {
+            session = new DefaultRepositorySystemSession();
+        }
+        if ( localRepository != null && localRepository.getBasedir() != null )
+        {
+            LocalRepository localRepo = new LocalRepository( localRepository.getBasedir() );
+            session.setLocalRepositoryManager( repoSystem.newLocalRepositoryManager( localRepo ) );
+        }
+        return session;
+    }
+
     private void injectSession1( RepositoryRequest request, MavenSession session )
     {
         if ( session != null )
         {
             request.setOffline( session.isOffline() );
             request.setForceUpdate( session.getRequest().isUpdateSnapshots() );
-            request.setTransferListener( session.getRequest().getTransferListener() );
         }
     }
 
@@ -163,30 +163,19 @@ public class DefaultArtifactResolver
         }
     }
 
-    public void resolve( Artifact artifact, List<ArtifactRepository> remoteRepositories,
-                         ArtifactRepository localRepository, TransferListener resolutionListener )
+    public void resolve( Artifact artifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository, TransferListener resolutionListener )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        RepositoryRequest request = new DefaultRepositoryRequest();
-        injectSession1( request, legacySupport.getSession() );
-        request.setLocalRepository( localRepository );
-        request.setRemoteRepositories( remoteRepositories );
-        resolve( artifact, request, resolutionListener, false );
+        resolve( artifact, remoteRepositories, getSession( localRepository ) );
     }
 
-    public void resolveAlways( Artifact artifact, List<ArtifactRepository> remoteRepositories,
-                               ArtifactRepository localRepository )
+    public void resolveAlways( Artifact artifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        RepositoryRequest request = new DefaultRepositoryRequest();
-        injectSession1( request, legacySupport.getSession() );
-        request.setLocalRepository( localRepository );
-        request.setRemoteRepositories( remoteRepositories );
-        resolve( artifact, request, null, true );
+        resolve( artifact, remoteRepositories, getSession( localRepository ) );
     }
 
-    private void resolve( Artifact artifact, RepositoryRequest request, TransferListener downloadMonitor,
-                          boolean force )
+    private void resolve( Artifact artifact, List<ArtifactRepository> remoteRepositories, RepositorySystemSession session )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
         if ( artifact == null )
@@ -194,28 +183,23 @@ public class DefaultArtifactResolver
             return;
         }
         
-        File destination;
-
         if ( Artifact.SCOPE_SYSTEM.equals( artifact.getScope() ) )
         {
             File systemFile = artifact.getFile();
 
             if ( systemFile == null )
             {
-                throw new ArtifactNotFoundException( "System artifact: " + artifact + " has no file attached",
-                                                     artifact );
+                throw new ArtifactNotFoundException( "System artifact: " + artifact + " has no file attached", artifact );
             }
 
             if ( !systemFile.exists() )
             {
-                throw new ArtifactNotFoundException( "System artifact: " + artifact + " not found in path: "
-                    + systemFile, artifact );
+                throw new ArtifactNotFoundException( "System artifact: " + artifact + " not found in path: " + systemFile, artifact );
             }
 
             if ( !systemFile.isFile() )
             {
-                throw new ArtifactNotFoundException( "System artifact: " + artifact + " is not a file: " + systemFile,
-                                                     artifact );
+                throw new ArtifactNotFoundException( "System artifact: " + artifact + " is not a file: " + systemFile, artifact );
             }
 
             artifact.setResolved( true );
@@ -223,237 +207,81 @@ public class DefaultArtifactResolver
             return;
         }
 
-        ArtifactRepository localRepository = request.getLocalRepository();
-
-        List<ArtifactRepository> remoteRepositories = request.getRemoteRepositories();
-
         if ( !artifact.isResolved() )
         {
-            // ----------------------------------------------------------------------
-            // Check for the existence of the artifact in the specified local
-            // ArtifactRepository. If it is present then simply return as the
-            // request for resolution has been satisfied.
-            // ----------------------------------------------------------------------
+            ArtifactResult result;
 
-            artifact = localRepository.find( artifact );
-
-            if ( artifact.isResolved() )
-            {
-                return;
-            }
-
-            transformationManager.transformForResolve( artifact, request );
-
-            destination = artifact.getFile();
-
-            if ( !request.isOffline() && ( force || !destination.exists() || isMutable( artifact ) ) )
-            {
             try
             {
-                    if ( artifact.getRepository() != null )
+                ArtifactRequest artifactRequest = new ArtifactRequest();
+                artifactRequest.setArtifact( RepositoryUtils.toArtifact( artifact ) );
+                artifactRequest.setRepositories( RepositoryUtils.toRepos( remoteRepositories ) );
+                result = repoSystem.resolveArtifact( session, artifactRequest );
+            }
+            catch ( org.sonatype.aether.resolution.ArtifactResolutionException e )
             {
-                        // the transformations discovered the artifact - so use it exclusively
-                        wagonManager.getArtifact( artifact, artifact.getRepository(), downloadMonitor,
-                                                  request.isForceUpdate() );
-                    }
-                    else
-                    {
-                        wagonManager.getArtifact( artifact, remoteRepositories, downloadMonitor,
-                                                  request.isForceUpdate() );
-                    }
-
-                    if ( localRepositoryMaintainer != null )
-                    {
-                        LocalRepositoryMaintainerEvent event =
-                            new DefaultLocalRepositoryMaintainerEvent( localRepository, artifact, null );
-                        localRepositoryMaintainer.artifactDownloaded( event );
-                    }
-
-                }
-                catch ( ResourceDoesNotExistException e )
+                if ( e.getCause() instanceof org.sonatype.aether.transfer.ArtifactNotFoundException )
                 {
                     throw new ArtifactNotFoundException( e.getMessage(), artifact, remoteRepositories, e );
                 }
-                catch ( TransferFailedException e )
+                else
                 {
                     throw new ArtifactResolutionException( e.getMessage(), artifact, remoteRepositories, e );
                 }
             }
 
-            if ( destination.exists() )
-            {
+            artifact.selectVersion( result.getArtifact().getVersion() );
+            artifact.setFile( result.getArtifact().getFile() );
             artifact.setResolved( true );
         }
-            else
-            {
-                if ( request.isOffline() )
-                {
-                    throw new ArtifactResolutionException( "The repository system is offline"
-                        + " and the requested artifact is not locally available at " + destination, artifact,
-                                                           remoteRepositories );
-                }
-                else
-                {
-                    throw new ArtifactResolutionException( "Failed to resolve artifact, possibly due to a "
-                        + "repository list that is not appropriately equipped for this artifact's metadata.", artifact,
-                                                           remoteRepositories );
-                }
     }
 
-            // 1.0-SNAPSHOT
-            //
-            // 1)         pom = 1.0-SNAPSHOT
-            // 2)         pom = 1.0-yyyymmdd.hhmmss
-            // 3) baseVersion = 1.0-SNAPSHOT
-            if ( artifact.isSnapshot() && isTimestamped( artifact ) )
-            {
-                String version = artifact.getVersion();
-
-                // 1.0-SNAPSHOT
-                artifact.selectVersion( artifact.getBaseVersion() );
-
-                // Make a file with a 1.0-SNAPSHOT format
-                File copy = new File( localRepository.getBasedir(), localRepository.pathOf( artifact ) );
-
-                // if the timestamped version was resolved or the copy doesn't exist then copy a version
-                // of the file like 1.0-SNAPSHOT. Even if there is a timestamped version the non-timestamped
-                // version will be created.
-                if ( !copy.exists() || copy.lastModified() != destination.lastModified()
-                    || copy.length() != destination.length() )
-                {
-                    // recopy file if it was reresolved, or doesn't exist.
-                    try
-                    {
-                        FileUtils.copyFile( destination, copy );
-
-                        copy.setLastModified( destination.lastModified() );
-                    }
-                    catch ( IOException e )
-                    {
-                        throw new ArtifactResolutionException( "Unable to copy resolved artifact for local use: "
-                            + e.getMessage(), artifact, remoteRepositories, e );
-                    }
-                }
-
-                // We are only going to use the 1.0-SNAPSHOT version
-                artifact.setFile( copy );
-
-                // Set the version to the 1.0-yyyymmdd.hhmmss version
-                artifact.selectVersion( version );
-            }
-        }
-    }
-
-    private boolean isMutable( Artifact artifact )
-    {
-        return artifact.isSnapshot() && !isTimestamped( artifact ) && !isLocalCopy( artifact );
-    }
-
-    private boolean isTimestamped( Artifact artifact )
-    {
-        return !artifact.getBaseVersion().equals( artifact.getVersion() );
-    }
-
-    private boolean isLocalCopy( Artifact artifact )
-    {
-        boolean localCopy = false;
-
-        for ( ArtifactMetadata m : artifact.getMetadataList() )
-        {
-            if ( m instanceof SnapshotArtifactRepositoryMetadata )
-            {
-                SnapshotArtifactRepositoryMetadata snapshotMetadata = (SnapshotArtifactRepositoryMetadata) m;
-
-                Metadata metadata = snapshotMetadata.getMetadata();
-
-                if ( metadata != null )
-                {
-                    Versioning versioning = metadata.getVersioning();
-
-                    if ( versioning != null )
-                    {
-                        Snapshot snapshot = versioning.getSnapshot();
-
-                        if ( snapshot != null )
-                        {
-                            // TODO is it possible to have more than one SnapshotArtifactRepositoryMetadata
-                            localCopy = snapshot.isLocalCopy();
-                        }
-                    }
-                }
-            }
-        }
-
-        return localCopy;
-    }
-
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         ArtifactRepository localRepository,
-                                                         List<ArtifactRepository> remoteRepositories,
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories,
                                                          ArtifactMetadataSource source, ArtifactFilter filter )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        return resolveTransitively( artifacts, originatingArtifact, Collections.EMPTY_MAP, localRepository,
-                                    remoteRepositories, source, filter );
+        return resolveTransitively( artifacts, originatingArtifact, Collections.EMPTY_MAP, localRepository, remoteRepositories, source, filter );
 
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         Map managedVersions, ArtifactRepository localRepository,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactMetadataSource source )
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, Map managedVersions, ArtifactRepository localRepository,
+                                                         List<ArtifactRepository> remoteRepositories, ArtifactMetadataSource source )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository,
-                                    remoteRepositories, source, null );
+        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository, remoteRepositories, source, null );
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         Map managedVersions, ArtifactRepository localRepository,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactMetadataSource source, ArtifactFilter filter )
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, Map managedVersions, ArtifactRepository localRepository,
+                                                         List<ArtifactRepository> remoteRepositories, ArtifactMetadataSource source, ArtifactFilter filter )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository,
-                                    remoteRepositories, source, filter, null );
+        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository, remoteRepositories, source, filter, null );
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactRepository localRepository,
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository,
                                                          ArtifactMetadataSource source )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
         return resolveTransitively( artifacts, originatingArtifact, localRepository, remoteRepositories, source, null );
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactRepository localRepository,
-                                                         ArtifactMetadataSource source,
-                                                         List<ResolutionListener> listeners )
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository,
+                                                         ArtifactMetadataSource source, List<ResolutionListener> listeners )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
         return resolveTransitively( artifacts, originatingArtifact, Collections.EMPTY_MAP, localRepository,
                                     remoteRepositories, source, null, listeners );
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         Map managedVersions, ArtifactRepository localRepository,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactMetadataSource source, ArtifactFilter filter,
-                                                         List<ResolutionListener> listeners )
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, Map managedVersions, ArtifactRepository localRepository,
+                                                         List<ArtifactRepository> remoteRepositories, ArtifactMetadataSource source, ArtifactFilter filter, List<ResolutionListener> listeners )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
-        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository,
-                                    remoteRepositories, source, filter, listeners, null );
+        return resolveTransitively( artifacts, originatingArtifact, managedVersions, localRepository, remoteRepositories, source, filter, listeners, null );
     }
 
-    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact,
-                                                         Map managedVersions, ArtifactRepository localRepository,
-                                                         List<ArtifactRepository> remoteRepositories,
-                                                         ArtifactMetadataSource source, ArtifactFilter filter,
-                                                         List<ResolutionListener> listeners,
+    public ArtifactResolutionResult resolveTransitively( Set<Artifact> artifacts, Artifact originatingArtifact, Map managedVersions, ArtifactRepository localRepository,
+                                                         List<ArtifactRepository> remoteRepositories, ArtifactMetadataSource source, ArtifactFilter filter, List<ResolutionListener> listeners,
                                                          List<ConflictResolver> conflictResolvers )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
@@ -499,7 +327,7 @@ public class DefaultArtifactResolver
         List<ResolutionListener> listeners = request.getListeners();
         ArtifactFilter collectionFilter = request.getCollectionFilter();                       
         ArtifactFilter resolutionFilter = request.getResolutionFilter();
-        TransferListener transferListener = TransferListenerAdapter.newAdapter( request.getTransferListener() );
+        RepositorySystemSession session = getSession( request.getLocalRepository() );
         
         //TODO: hack because metadata isn't generated in m2e correctly and i want to run the maven i have in the workspace
         if ( source == null )
@@ -537,7 +365,7 @@ public class DefaultArtifactResolver
         {            
             try
             {
-                resolve( rootArtifact, request, transferListener, false );
+                resolve( rootArtifact, request.getRemoteRepositories(), session );
             }
             catch ( ArtifactResolutionException e )
             {
@@ -628,8 +456,7 @@ public class DefaultArtifactResolver
         // so we give this back to the calling code and let them deal with this information
         // appropriately.
 
-        if ( result.hasMetadataResolutionExceptions() || result.hasVersionRangeViolations()
-            || result.hasCircularDependencyExceptions() )
+        if ( result.hasMetadataResolutionExceptions() || result.hasVersionRangeViolations() || result.hasCircularDependencyExceptions() )
         {
             return result;
         }
@@ -646,11 +473,8 @@ public class DefaultArtifactResolver
 
                 if ( resolutionFilter == null || resolutionFilter.include( artifact ) )
                 {
-                    ArtifactResolutionRequest childRequest = new ArtifactResolutionRequest( request );
-                    childRequest.setRemoteRepositories( node.getRemoteRepositories() );
-
-                    executor.execute( new ResolveTask( classLoader, latch, artifact, transferListener, childRequest,
-                                                       result ) );
+                    executor.execute( new ResolveTask( classLoader, latch, artifact, session,
+                                                       node.getRemoteRepositories(), result ) );
                 }
                 else
                 {
@@ -682,8 +506,7 @@ public class DefaultArtifactResolver
         return result;
     }
 
-    public void resolve( Artifact artifact, List<ArtifactRepository> remoteRepositories,
-                         ArtifactRepository localRepository )
+    public void resolve( Artifact artifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository )
         throws ArtifactResolutionException, ArtifactNotFoundException
     {
         resolve( artifact, remoteRepositories, localRepository, null );
@@ -719,21 +542,20 @@ public class DefaultArtifactResolver
 
         private final Artifact artifact;
 
-        private final TransferListener transferListener;
+        private final RepositorySystemSession session;
 
-        private final ArtifactResolutionRequest request;
+        private final List<ArtifactRepository> remoteRepositories;
 
         private final ArtifactResolutionResult result;
 
-        public ResolveTask( ClassLoader classLoader, CountDownLatch latch, Artifact artifact,
-                            TransferListener transferListener, ArtifactResolutionRequest request,
-                            ArtifactResolutionResult result )
+        public ResolveTask( ClassLoader classLoader, CountDownLatch latch, Artifact artifact, RepositorySystemSession session,
+                            List<ArtifactRepository> remoteRepositories, ArtifactResolutionResult result )
         {
             this.classLoader = classLoader;
             this.latch = latch;
             this.artifact = artifact;
-            this.transferListener = transferListener;
-            this.request = request;
+            this.session = session;
+            this.remoteRepositories = remoteRepositories;
             this.result = result;
         }
 
@@ -742,7 +564,7 @@ public class DefaultArtifactResolver
             try
             {
                 Thread.currentThread().setContextClassLoader( classLoader );
-                resolve( artifact, request, transferListener, false );
+                resolve( artifact, remoteRepositories, session );
             }
             catch ( ArtifactNotFoundException anfe )
             {

maven-compat/src/main/java/org/apache/maven/project/DefaultMavenProjectBuilder.java

@@ -94,6 +94,7 @@ public class DefaultMavenProjectBuilder
         MavenSession session = legacySupport.getSession();
         if ( session != null )
         {
+            request.setRepositorySession( session.getRepositorySession() );
             request.setOffline( session.isOffline() );
             request.setSystemProperties( session.getSystemProperties() );
             if ( request.getUserProperties().isEmpty() )
@@ -108,7 +109,6 @@ public class DefaultMavenProjectBuilder
                 request.setMirrors( req.getMirrors() );
                 request.setProxies( req.getProxies() );
                 request.setRemoteRepositories( req.getRemoteRepositories() );
-                request.setTransferListener( req.getTransferListener() );
                 request.setForceUpdate( req.isUpdateSnapshots() );
             }
         }

maven-compat/src/main/java/org/apache/maven/repository/legacy/resolver/DefaultLegacyArtifactCollector.java

@@ -83,7 +83,6 @@ public class DefaultLegacyArtifactCollector
             request.setServers( session.getRequest().getServers() );
             request.setMirrors( session.getRequest().getMirrors() );
             request.setProxies( session.getRequest().getProxies() );
-            request.setTransferListener( session.getRequest().getTransferListener() );
         }
     }
 

maven-compat/src/test/java/org/apache/maven/artifact/AbstractArtifactComponentTestCase.java

@@ -29,11 +29,33 @@ import java.util.List;
 
 import org.apache.maven.artifact.factory.ArtifactFactory;
 import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.plugin.LegacySupport;
 import org.apache.maven.repository.legacy.repository.ArtifactRepositoryFactory;
 import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
-import org.apache.maven.artifact.repository.DefaultArtifactRepository;
 import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
+import org.apache.maven.execution.DefaultMavenExecutionRequest;
+import org.apache.maven.execution.DefaultMavenExecutionResult;
+import org.apache.maven.execution.MavenSession;
 import org.codehaus.plexus.PlexusTestCase;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.collection.DependencyGraphTransformer;
+import org.sonatype.aether.collection.DependencyManager;
+import org.sonatype.aether.collection.DependencySelector;
+import org.sonatype.aether.collection.DependencyTraverser;
+import org.sonatype.aether.impl.internal.SimpleLocalRepositoryManager;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.graph.manager.ClassicDependencyManager;
+import org.sonatype.aether.util.graph.selector.AndDependencySelector;
+import org.sonatype.aether.util.graph.selector.ExclusionDependencySelector;
+import org.sonatype.aether.util.graph.selector.OptionalDependencySelector;
+import org.sonatype.aether.util.graph.selector.ScopeDependencySelector;
+import org.sonatype.aether.util.graph.transformer.ChainedDependencyGraphTransformer;
+import org.sonatype.aether.util.graph.transformer.NearestVersionConflictResolver;
+import org.sonatype.aether.util.graph.transformer.ConflictMarker;
+import org.sonatype.aether.util.graph.transformer.JavaDependencyContextRefiner;
+import org.sonatype.aether.util.graph.transformer.JavaEffectiveScopeCalculator;
+import org.sonatype.aether.util.graph.traverser.FatArtifactTraverser;
 
 /**
  * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
@@ -53,6 +75,14 @@ public abstract class AbstractArtifactComponentTestCase
         super.setUp();
         artifactFactory = lookup( ArtifactFactory.class);        
         artifactRepositoryFactory = lookup( ArtifactRepositoryFactory.class );
+
+        RepositorySystemSession repoSession = initRepoSession();
+        MavenSession session =
+            new MavenSession( getContainer(), repoSession, new DefaultMavenExecutionRequest(),
+                              new DefaultMavenExecutionResult() );
+
+        LegacySupport legacySupport = lookup(LegacySupport.class);
+        legacySupport.setSession( session );
     }
     
     @Override
@@ -297,4 +327,33 @@ public abstract class AbstractArtifactComponentTestCase
             }
         }
     }
+
+    protected RepositorySystemSession initRepoSession()
+        throws Exception
+    {
+        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession();
+        session.setIgnoreMissingArtifactDescriptor( true );
+        session.setIgnoreInvalidArtifactDescriptor( true );
+        DependencyTraverser depTraverser = new FatArtifactTraverser();
+        session.setDependencyTraverser( depTraverser );
+
+        DependencyManager depManager = new ClassicDependencyManager();
+        session.setDependencyManager( depManager );
+
+        DependencySelector depFilter =
+            new AndDependencySelector( new ScopeDependencySelector( "test", "provided" ),
+                                       new OptionalDependencySelector(), new ExclusionDependencySelector() );
+        session.setDependencySelector( depFilter );
+
+        DependencyGraphTransformer transformer =
+            new ChainedDependencyGraphTransformer( new ConflictMarker(), new JavaEffectiveScopeCalculator(),
+                                                   new NearestVersionConflictResolver(),
+                                                   new JavaDependencyContextRefiner() );
+        session.setDependencyGraphTransformer( transformer );
+
+        session.setLocalRepositoryManager( new SimpleLocalRepositoryManager( localRepository().getBasedir() ) );
+
+        return session;
+    }
+
 }

maven-compat/src/test/java/org/apache/maven/project/AbstractMavenProjectTestCase.java

@@ -27,6 +27,7 @@ import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
 import org.apache.maven.model.building.ModelBuildingException;
 import org.apache.maven.model.building.ModelProblem;
 import org.apache.maven.repository.RepositorySystem;
+import org.apache.maven.repository.internal.MavenRepositorySystemSession;
 import org.codehaus.plexus.PlexusTestCase;
 
 /**
@@ -129,6 +130,7 @@ public abstract class AbstractMavenProjectTestCase
         configuration.setRemoteRepositories( Arrays.asList( new ArtifactRepository[] {} ) );
         configuration.setProcessPlugins( false );
         configuration.setResolveDependencies( true );
+        initRepoSession( configuration );
 
         try
         {
@@ -157,8 +159,17 @@ public abstract class AbstractMavenProjectTestCase
     {
         ProjectBuildingRequest configuration = new DefaultProjectBuildingRequest();
         configuration.setLocalRepository( getLocalRepository() );
+        initRepoSession( configuration );
 
         return projectBuilder.build( pom, configuration ).getProject();
     }
 
+    protected void initRepoSession( ProjectBuildingRequest request )
+    {
+        File localRepo = new File( request.getLocalRepository().getBasedir() );
+        MavenRepositorySystemSession session = new MavenRepositorySystemSession();
+        session.setLocalRepositoryManager( new LegacyLocalRepositoryManager( localRepo ) );
+        request.setRepositorySession( session );
+    }
+
 }

maven-compat/src/test/java/org/apache/maven/project/ClasspathArtifactResolver.java

@@ -0,0 +1,82 @@
+package org.apache.maven.project;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.impl.ArtifactResolver;
+import org.sonatype.aether.impl.internal.DefaultArtifactResolver;
+import org.sonatype.aether.resolution.ArtifactRequest;
+import org.sonatype.aether.resolution.ArtifactResolutionException;
+import org.sonatype.aether.resolution.ArtifactResult;
+import org.sonatype.aether.transfer.ArtifactNotFoundException;
+
+/**
+ * @author Benjamin Bentmann
+ */
+@Component( role = ArtifactResolver.class, hint = "classpath" )
+public class ClasspathArtifactResolver
+    extends DefaultArtifactResolver
+{
+
+    public List<ArtifactResult> resolveArtifacts( RepositorySystemSession session,
+                                                  Collection<? extends ArtifactRequest> requests )
+        throws ArtifactResolutionException
+    {
+        List<ArtifactResult> results = new ArrayList<ArtifactResult>();
+
+        for ( ArtifactRequest request : requests )
+        {
+            ArtifactResult result = new ArtifactResult( request );
+            results.add( result );
+
+            Artifact artifact = request.getArtifact();
+            if ( "maven-test".equals( artifact.getGroupId() ) )
+            {
+                String scope = artifact.getArtifactId().substring( "scope-".length() );
+
+                try
+                {
+                    artifact = artifact.setFile( ProjectClasspathTest.getFileForClasspathResource( ProjectClasspathTest.dir
+                        + "transitive-" + scope + "-dep.xml" ) );
+                    result.setArtifact( artifact );
+                }
+                catch ( FileNotFoundException e )
+                {
+                    throw new IllegalStateException( "Missing test POM for " + artifact );
+                }
+            }
+            else
+            {
+                result.addException( new ArtifactNotFoundException( artifact, null ) );
+                throw new ArtifactResolutionException( results );
+            }
+        }
+
+        return results;
+    }
+
+}

maven-compat/src/test/java/org/apache/maven/project/EmptyLifecycleExecutor.java

@@ -26,17 +26,9 @@ import java.util.Set;
 
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.lifecycle.*;
-import org.apache.maven.lifecycle.LifecycleExecutionException;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.model.PluginExecution;
-import org.apache.maven.plugin.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.MojoExecution;
-import org.apache.maven.plugin.MojoNotFoundException;
-import org.apache.maven.plugin.PluginDescriptorParsingException;
-import org.apache.maven.plugin.PluginNotFoundException;
-import org.apache.maven.plugin.PluginResolutionException;
-import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
-import org.apache.maven.plugin.version.PluginVersionResolutionException;
 
 /**
  * A stub implementation that assumes an empty lifecycle to bypass interaction with the plugin manager and to avoid
@@ -49,8 +41,6 @@ public class EmptyLifecycleExecutor
 {
 
     public MavenExecutionPlan calculateExecutionPlan( MavenSession session, String... tasks )
-        throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
-        MojoNotFoundException
     {
         return new MavenExecutionPlan(null, null, null, new DefaultLifecycles() );
     }
@@ -102,14 +92,10 @@ public class EmptyLifecycleExecutor
     }
 
     public void calculateForkedExecutions( MojoExecution mojoExecution, MavenSession session )
-        throws MojoNotFoundException, PluginNotFoundException, PluginResolutionException,
-        PluginDescriptorParsingException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
-        LifecyclePhaseNotFoundException, LifecycleNotFoundException, PluginVersionResolutionException
     {
     }
 
     public List<MavenProject> executeForkedExecutions( MojoExecution mojoExecution, MavenSession session )
-        throws LifecycleExecutionException
     {
         return Collections.emptyList();
     }

maven-compat/src/test/java/org/apache/maven/project/EmptyLifecyclePluginAnalyzer.java

@@ -0,0 +1,78 @@
+package org.apache.maven.project;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.apache.maven.lifecycle.LifeCyclePluginAnalyzer;
+import org.apache.maven.model.Plugin;
+import org.apache.maven.model.PluginExecution;
+
+/**
+ * @author Benjamin Bentmann
+ */
+public class EmptyLifecyclePluginAnalyzer
+    implements LifeCyclePluginAnalyzer
+{
+    public Set<Plugin> getPluginsBoundByDefaultToAllLifecycles( String packaging )
+    {
+        Set<Plugin> plugins;
+
+        // NOTE: The upper-case packaging name is intentional, that's a special hinting mode used for certain tests
+        if ( "JAR".equals( packaging ) )
+        {
+            plugins = new LinkedHashSet<Plugin>();
+
+            plugins.add( newPlugin( "maven-compiler-plugin", "compile", "testCompile" ) );
+            plugins.add( newPlugin( "maven-resources-plugin", "resources", "testResources" ) );
+            plugins.add( newPlugin( "maven-surefire-plugin", "test" ) );
+            plugins.add( newPlugin( "maven-jar-plugin", "jar" ) );
+            plugins.add( newPlugin( "maven-install-plugin", "install" ) );
+            plugins.add( newPlugin( "maven-deploy-plugin", "deploy" ) );
+        }
+        else
+        {
+            plugins = Collections.emptySet();
+        }
+
+        return plugins;
+    }
+
+    private Plugin newPlugin( String artifactId, String... goals )
+    {
+        Plugin plugin = new Plugin();
+
+        plugin.setGroupId( "org.apache.maven.plugins" );
+        plugin.setArtifactId( artifactId );
+
+        for ( String goal : goals )
+        {
+            PluginExecution pluginExecution = new PluginExecution();
+            pluginExecution.setId( "default-" + goal );
+            pluginExecution.addGoal( goal );
+            plugin.addExecution( pluginExecution );
+        }
+
+        return plugin;
+    }
+
+}

maven-compat/src/test/java/org/apache/maven/project/LegacyLocalRepositoryManager.java

@@ -0,0 +1,59 @@
+package org.apache.maven.project;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.impl.internal.SimpleLocalRepositoryManager;
+
+/**
+ * @author Benjamin Bentmann
+ */
+public class LegacyLocalRepositoryManager
+    extends SimpleLocalRepositoryManager
+{
+
+    public LegacyLocalRepositoryManager( File basedir )
+    {
+        super( basedir );
+    }
+
+    public String getPathForLocalArtifact( Artifact artifact )
+    {
+        StringBuilder path = new StringBuilder( 128 );
+
+        path.append( artifact.getGroupId() ).append( '/' );
+
+        path.append( artifact.getExtension() ).append( 's' ).append( '/' );
+
+        path.append( artifact.getArtifactId() ).append( '-' ).append( artifact.getVersion() );
+
+        if ( artifact.getClassifier().length() > 0 )
+        {
+            path.append( '-' ).append( artifact.getClassifier() );
+        }
+
+        path.append( '.' ).append( artifact.getExtension() );
+
+        return path.toString();
+    }
+
+}

maven-compat/src/test/java/org/apache/maven/project/ProjectClasspathTest.java

@@ -24,6 +24,9 @@ import java.util.Iterator;
 
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.repository.RepositorySystem;
+import org.apache.maven.repository.internal.DefaultArtifactDescriptorReader;
+import org.sonatype.aether.impl.ArtifactDescriptorReader;
+import org.sonatype.aether.impl.ArtifactResolver;
 
 public class ProjectClasspathTest
     extends AbstractMavenProjectTestCase
@@ -33,6 +36,10 @@ public class ProjectClasspathTest
     public void setUp()
         throws Exception
     {
+        ArtifactResolver resolver = lookup( ArtifactResolver.class, "classpath" );
+        DefaultArtifactDescriptorReader pomReader = (DefaultArtifactDescriptorReader)lookup(ArtifactDescriptorReader.class);
+        pomReader.setArtifactResolver( resolver );
+
         projectBuilder = lookup( ProjectBuilder.class, "classpath" );
 
         // the metadata source looks up the default impl, so we have to trick it

maven-compat/src/test/java/org/apache/maven/repository/LegacyRepositorySystemTest.java

@@ -24,11 +24,17 @@ import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
 import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
 import org.apache.maven.artifact.resolver.ResolutionErrorHandler;
+import org.apache.maven.execution.DefaultMavenExecutionRequest;
+import org.apache.maven.execution.DefaultMavenExecutionResult;
+import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Dependency;
 import org.apache.maven.model.Repository;
 import org.apache.maven.model.RepositoryPolicy;
+import org.apache.maven.plugin.LegacySupport;
 import org.apache.maven.repository.RepositorySystem;
 import org.codehaus.plexus.PlexusTestCase;
+import org.sonatype.aether.impl.internal.SimpleLocalRepositoryManager;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
 
 /**
  * Tests {@link LegacyRepositorySystem}.
@@ -107,6 +113,12 @@ public class LegacyRepositorySystemTest
             .setRemoteRepositories( getRemoteRepositories() )
             .setLocalRepository( getLocalRepository() );            
                             
+        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession();
+        session.setLocalRepositoryManager( new SimpleLocalRepositoryManager( request.getLocalRepository().getBasedir() ) );
+        LegacySupport legacySupport = lookup( LegacySupport.class );
+        legacySupport.setSession( new MavenSession( getContainer(), session, new DefaultMavenExecutionRequest(),
+                                                    new DefaultMavenExecutionResult() ) );
+
         ArtifactResolutionResult result = repositorySystem.resolve( request );
         resolutionErrorHandler.throwErrors( request, result );        
         assertEquals( 2, result.getArtifacts().size() );

maven-compat/src/test/java/org/apache/maven/repository/ideworkspace/IdeWorkspaceRepositoryTest.java

@@ -1,83 +0,0 @@
-package org.apache.maven.repository.ideworkspace;
-
-import java.io.File;
-import java.util.ArrayList;
-
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
-import org.apache.maven.repository.DelegatingLocalArtifactRepository;
-import org.apache.maven.repository.RepositorySystem;
-import org.codehaus.plexus.PlexusTestCase;
-
-public class IdeWorkspaceRepositoryTest
-    extends PlexusTestCase
-{
-    
-    private RepositorySystem repositorySystem;
-    private ArtifactRepository localRepository;
-
-    @Override
-    protected void setUp()
-        throws Exception
-    {
-        super.setUp();
-
-        repositorySystem = lookup( RepositorySystem.class );
-        localRepository = repositorySystem.createLocalRepository( new File( "target/IdeWorkspaceRepositoryTest" ).getCanonicalFile() );
-    }
-    
-    @Override
-    protected void tearDown()
-        throws Exception
-    {
-        repositorySystem = null;
-        localRepository = null;
-        
-        super.tearDown();
-    }
-
-    public void testResolveFromWorkspace()
-        throws Exception
-    {
-
-        Artifact artifact =
-            repositorySystem.createArtifact( TestIdeWorkspaceRepository.GROUP_ID, TestIdeWorkspaceRepository.ARTIFACT_ID,
-                                   TestIdeWorkspaceRepository.VERSION, "jar" );
-
-        ArtifactResolutionRequest request = new ArtifactResolutionRequest();
-        request.setArtifact( artifact );
-        request.setLocalRepository( localRepository );
-        request.setRemoteRepositories( new ArrayList<ArtifactRepository>() );
-
-        repositorySystem.resolve( request );
-
-        assertTrue( artifact.isResolved() );
-        assertEquals( TestIdeWorkspaceRepository.ARTIFACT_FILE, artifact.getFile() );
-        assertSame( localRepository, request.getLocalRepository() );
-    }
-
-    public void testDelegatingLocalRepo()
-        throws Exception
-    {
-        Artifact artifact =
-            repositorySystem.createArtifact( TestIdeWorkspaceRepository.GROUP_ID, TestIdeWorkspaceRepository.ARTIFACT_ID,
-                                   TestIdeWorkspaceRepository.VERSION, "jar" );
-        
-        DelegatingLocalArtifactRepository delegatingLocalArtifactRepository = new DelegatingLocalArtifactRepository( localRepository );
-
-        ArtifactResolutionRequest request = new ArtifactResolutionRequest();
-        request.setArtifact( artifact );
-        request.setLocalRepository( delegatingLocalArtifactRepository );
-        request.setRemoteRepositories( new ArrayList<ArtifactRepository>() );
-
-        repositorySystem.resolve( request );
-
-        assertTrue( artifact.isResolved() );
-        assertEquals( TestIdeWorkspaceRepository.ARTIFACT_FILE, artifact.getFile() );
-        
-        // make sure we restore original repository
-        assertSame( delegatingLocalArtifactRepository, request.getLocalRepository() );
-        assertNull( delegatingLocalArtifactRepository.getIdeWorspace() );
-    }
-}

maven-compat/src/test/java/org/apache/maven/repository/ideworkspace/TestIdeWorkspaceRepository.java

@@ -1,40 +0,0 @@
-package org.apache.maven.repository.ideworkspace;
-
-import java.io.File;
-
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.repository.LocalArtifactRepository;
-import org.codehaus.plexus.component.annotations.Component;
-
-@Component( role = LocalArtifactRepository.class, hint = LocalArtifactRepository.IDE_WORKSPACE )
-public class TestIdeWorkspaceRepository
-    extends LocalArtifactRepository
-{
-
-    public static final String GROUP_ID = "test";
-
-    public static final String ARTIFACT_ID = "test";
-
-    public static final String VERSION = "1.0.0-SNAPSHOT";
-
-    public static final File ARTIFACT_FILE = new File( "/a/b/c/d" );
-
-    @Override
-    public Artifact find( Artifact artifact )
-    {
-        if ( GROUP_ID.equals( artifact.getGroupId() ) && ARTIFACT_ID.equals( artifact.getArtifactId() )
-            && VERSION.equals( artifact.getVersion() ) )
-        {
-            artifact.setFile( ARTIFACT_FILE );
-            artifact.setResolved( true );
-        }
-        return artifact;
-    }
-
-    @Override
-    public boolean hasLocalMetadata()
-    {
-        return false;
-    }
-
-}

maven-compat/src/test/resources/org/apache/maven/artifact/resolver/ArtifactResolverTest.xml

@@ -30,16 +30,6 @@ under the License.
           <role-hint>default</role-hint>
           <field-name>logger</field-name>
         </requirement>
-        <requirement>
-          <role>org.apache.maven.repository.legacy.WagonManager</role>
-          <role-hint>default</role-hint>
-          <field-name>wagonManager</field-name>
-        </requirement>
-        <requirement>
-          <role>org.apache.maven.repository.legacy.resolver.transform.ArtifactTransformationManager</role>
-          <role-hint>default</role-hint>
-          <field-name>transformationManager</field-name>
-        </requirement>
         <requirement>
           <role>org.apache.maven.artifact.factory.ArtifactFactory</role>
           <role-hint>default</role-hint>
@@ -65,17 +55,16 @@ under the License.
           <role-hint>default</role-hint>
           <field-name>container</field-name>
         </requirement>
-        <requirement>
-          <role>org.apache.maven.repository.LocalRepositoryMaintainer</role>
-          <role-hint>default</role-hint>
-          <field-name>localRepositoryMaintainer</field-name>
-          <optional>true</optional>
-        </requirement>
         <requirement>
           <role>org.apache.maven.plugin.LegacySupport</role>
           <role-hint>default</role-hint>
           <field-name>legacySupport</field-name>
         </requirement>
+        <requirement>
+          <role>org.sonatype.aether.RepositorySystem</role>
+          <role-hint>default</role-hint>
+          <field-name>repoSystem</field-name>
+        </requirement>
       </requirements>
     </component>
   </components>

maven-compat/src/test/resources/org/apache/maven/project/AbstractMavenProjectTestCase.xml

@@ -2,8 +2,8 @@
 <plexus>
   <components>
     <component>
-      <role>org.apache.maven.lifecycle.LifecycleExecutor</role>
-      <implementation>org.apache.maven.project.EmptyLifecycleExecutor</implementation>
+      <role>org.apache.maven.lifecycle.LifeCyclePluginAnalyzer</role>
+      <implementation>org.apache.maven.project.EmptyLifecyclePluginAnalyzer</implementation>
     </component>
   </components>
 </plexus>

maven-core/pom.xml

@@ -53,6 +53,15 @@
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-model-builder</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-aether-provider</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.sonatype.aether</groupId>
+      <artifactId>aether-impl</artifactId>
+      <version>${aetherVersion}</version>
+    </dependency>
     <!-- Plexus -->
     <dependency>
       <groupId>org.sonatype.spice</groupId>

maven-core/src/main/java/org/apache/maven/ArtifactFilterManager.java

@@ -19,6 +19,8 @@ package org.apache.maven;
  * under the License.
  */
 
+import java.util.Set;
+
 import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 
 public interface ArtifactFilterManager
@@ -39,4 +41,7 @@ public interface ArtifactFilterManager
      * @param artifactId
      */
     void excludeArtifact( String artifactId );
+
+    Set<String> getCoreArtifactExcludes();
+
 }

maven-core/src/main/java/org/apache/maven/DefaultArtifactFilterManager.java

@@ -59,6 +59,7 @@ public class DefaultArtifactFilterManager
         artifacts.add( "plexus:plexus-container-default" );
         artifacts.add( "org.sonatype.spice:spice-inject-plexus" );
         artifacts.add( "org.apache.maven:maven-artifact" );
+        artifacts.add( "org.apache.maven:maven-aether-provider" );
         artifacts.add( "org.apache.maven:maven-artifact-manager" );
         artifacts.add( "org.apache.maven:maven-compat" );
         artifacts.add( "org.apache.maven:maven-core" );
@@ -78,6 +79,8 @@ public class DefaultArtifactFilterManager
         artifacts.add( "org.apache.maven:maven-settings-builder" );
         artifacts.add( "org.apache.maven:maven-toolchain" );
         artifacts.add( "org.apache.maven.wagon:wagon-provider-api" );
+        artifacts.add( "org.sonatype.aether:aether-api" );
+        artifacts.add( "org.sonatype.aether:aether-spi" );
 
         /*
          * NOTE: Don't exclude the wagons or any of their dependencies (apart from the wagon API). This would otherwise
@@ -120,18 +123,11 @@ public class DefaultArtifactFilterManager
     /**
      * Returns the artifact filter for the standard core artifacts.
      *
-     * @see org.apache.maven.ArtifactFilterManager#getExtensionArtifactFilter()
+     * @see org.apache.maven.ArtifactFilterManager#getExtensionDependencyFilter()
      */
     public ArtifactFilter getCoreArtifactFilter()
     {
-        Set<String> excludes = new LinkedHashSet<String>( DEFAULT_EXCLUSIONS );
-
-        for ( ArtifactFilterManagerDelegate delegate : getDelegates() )
-        {
-            delegate.addCoreExcludes( excludes );
-        }
-
-        return new ExclusionSetFilter( excludes );
+        return new ExclusionSetFilter( getCoreArtifactExcludes() );
     }
 
     private List<ArtifactFilterManagerDelegate> getDelegates()
@@ -154,4 +150,16 @@ public class DefaultArtifactFilterManager
         excludedArtifacts.add( artifactId );
     }
 
+    public Set<String> getCoreArtifactExcludes()
+    {
+        Set<String> excludes = new LinkedHashSet<String>( DEFAULT_EXCLUSIONS );
+
+        for ( ArtifactFilterManagerDelegate delegate : getDelegates() )
+        {
+            delegate.addCoreExcludes( excludes );
+        }
+
+        return excludes;
+    }
+
 }

maven-core/src/main/java/org/apache/maven/DefaultMaven.java

@@ -1,22 +1,18 @@
 package org.apache.maven;
 
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  * 
  * http://www.apache.org/licenses/LICENSE-2.0
  * 
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
 
 import java.io.File;
@@ -33,6 +29,7 @@ import java.util.List;
 import java.util.Map;
 
 import org.apache.maven.artifact.ArtifactUtils;
+import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
 import org.apache.maven.execution.DefaultMavenExecutionResult;
 import org.apache.maven.execution.ExecutionEvent;
 import org.apache.maven.execution.MavenExecutionRequest;
@@ -47,6 +44,7 @@ import org.apache.maven.model.building.ModelProblem;
 import org.apache.maven.model.building.ModelProblemUtils;
 import org.apache.maven.model.building.ModelSource;
 import org.apache.maven.model.building.UrlModelSource;
+import org.apache.maven.plugin.LegacySupport;
 import org.apache.maven.project.DuplicateProjectException;
 import org.apache.maven.project.MavenProject;
 import org.apache.maven.project.ProjectBuilder;
@@ -56,6 +54,13 @@ import org.apache.maven.project.ProjectBuildingResult;
 import org.apache.maven.project.ProjectSorter;
 import org.apache.maven.repository.DelegatingLocalArtifactRepository;
 import org.apache.maven.repository.LocalRepositoryNotAccessibleException;
+import org.apache.maven.settings.Mirror;
+import org.apache.maven.settings.Proxy;
+import org.apache.maven.settings.Server;
+import org.apache.maven.settings.building.SettingsProblem;
+import org.apache.maven.settings.crypto.DefaultSettingsDecryptionRequest;
+import org.apache.maven.settings.crypto.SettingsDecrypter;
+import org.apache.maven.settings.crypto.SettingsDecryptionResult;
 import org.codehaus.plexus.PlexusContainer;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
@@ -63,6 +68,34 @@ import org.codehaus.plexus.component.repository.exception.ComponentLookupExcepti
 import org.codehaus.plexus.logging.Logger;
 import org.codehaus.plexus.util.StringUtils;
 import org.codehaus.plexus.util.dag.CycleDetectedException;
+import org.sonatype.aether.RepositoryEvent;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.collection.DependencyGraphTransformer;
+import org.sonatype.aether.collection.DependencyManager;
+import org.sonatype.aether.collection.DependencySelector;
+import org.sonatype.aether.collection.DependencyTraverser;
+import org.sonatype.aether.repository.Authentication;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RepositoryPolicy;
+import org.sonatype.aether.repository.WorkspaceReader;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.graph.manager.ClassicDependencyManager;
+import org.sonatype.aether.util.graph.selector.AndDependencySelector;
+import org.sonatype.aether.util.graph.selector.ExclusionDependencySelector;
+import org.sonatype.aether.util.graph.selector.OptionalDependencySelector;
+import org.sonatype.aether.util.graph.selector.ScopeDependencySelector;
+import org.sonatype.aether.util.graph.transformer.ChainedDependencyGraphTransformer;
+import org.sonatype.aether.util.graph.transformer.NearestVersionConflictResolver;
+import org.sonatype.aether.util.graph.transformer.ConflictMarker;
+import org.sonatype.aether.util.graph.transformer.JavaDependencyContextRefiner;
+import org.sonatype.aether.util.graph.transformer.JavaEffectiveScopeCalculator;
+import org.sonatype.aether.util.graph.traverser.FatArtifactTraverser;
+import org.sonatype.aether.util.listener.AbstractRepositoryListener;
+import org.sonatype.aether.util.repository.ChainedWorkspaceReader;
+import org.sonatype.aether.util.repository.DefaultAuthenticationSelector;
+import org.sonatype.aether.util.repository.DefaultMirrorSelector;
+import org.sonatype.aether.util.repository.DefaultProxySelector;
 
 /**
  * @author Jason van Zyl
@@ -78,7 +111,6 @@ public class DefaultMaven
     @Requirement
     protected ProjectBuilder projectBuilder;
 
-
     @Requirement
     private LifecycleStarter lifecycleStarter;
 
@@ -91,6 +123,21 @@ public class DefaultMaven
     @Requirement
     private ExecutionEventCatapult eventCatapult;
 
+    @Requirement
+    private ArtifactHandlerManager artifactHandlerManager;
+
+    @Requirement( optional = true, hint = "ide" )
+    private WorkspaceReader workspaceRepository;
+
+    @Requirement
+    private RepositorySystem repoSystem;
+
+    @Requirement
+    private SettingsDecrypter settingsDecrypter;
+
+    @Requirement
+    private LegacySupport legacySupport;
+
     public MavenExecutionResult execute( MavenExecutionRequest request )
     {
         MavenExecutionResult result;
@@ -113,6 +160,10 @@ public class DefaultMaven
                 processResult( new DefaultMavenExecutionResult(),
                                new InternalErrorException( "Internal error: " + e, e ) );
         }
+        finally
+        {
+            legacySupport.setSession( null );
+        }
 
         return result;
     }
@@ -123,8 +174,7 @@ public class DefaultMaven
         //TODO: Need a general way to inject standard properties
         if ( request.getStartTime() != null )
         {
-            request.getSystemProperties().put( "${build.timestamp}",
-                                               new SimpleDateFormat( "yyyyMMdd-hhmm" ).format( request.getStartTime() ) );
+            request.getSystemProperties().put( "${build.timestamp}", new SimpleDateFormat( "yyyyMMdd-hhmm" ).format( request.getStartTime() ) );
         }        
         
         request.setStartTime( new Date() );
@@ -145,7 +195,10 @@ public class DefaultMaven
         
         request.setLocalRepository( delegatingLocalArtifactRepository );        
 
-        MavenSession session = new MavenSession( container, request, result );
+        DefaultRepositorySystemSession repoSession = (DefaultRepositorySystemSession) newRepositorySession( request );
+
+        MavenSession session = new MavenSession( container, repoSession, request, result );
+        legacySupport.setSession( session );
 
         try
         {
@@ -161,6 +214,8 @@ public class DefaultMaven
 
         eventCatapult.fire( ExecutionEvent.Type.ProjectDiscoveryStarted, session, null );
 
+        request.getProjectBuildingRequest().setRepositorySession( session.getRepositorySession() );
+
         //TODO: optimize for the single project or no project
         
         List<MavenProject> projects;
@@ -189,7 +244,10 @@ public class DefaultMaven
             // Reactor
             // Workspace
             // User Local Repository
-            delegatingLocalArtifactRepository.setBuildReactor( new ReactorArtifactRepository( projectMap ) );
+            ReactorReader reactorRepository = new ReactorReader( projectMap );
+
+            repoSession.setWorkspaceReader( ChainedWorkspaceReader.newInstance( reactorRepository,
+                                                                                repoSession.getWorkspaceReader() ) );
         }
         catch ( org.apache.maven.DuplicateProjectException e )
         {
@@ -261,6 +319,132 @@ public class DefaultMaven
         return result;
     }
 
+    public RepositorySystemSession newRepositorySession( MavenExecutionRequest request )
+    {
+        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession();
+
+        session.setCache( request.getRepositoryCache() );
+
+        session.setIgnoreInvalidArtifactDescriptor( true ).setIgnoreMissingArtifactDescriptor( true );
+
+        session.setUserProps( request.getUserProperties() );
+        session.setSystemProps( request.getSystemProperties() );
+        session.setConfigProps( request.getSystemProperties() );
+
+        session.setOffline( request.isOffline() );
+        session.setChecksumPolicy( request.getGlobalChecksumPolicy() );
+        session.setUpdatePolicy( request.isUpdateSnapshots() ? RepositoryPolicy.UPDATE_POLICY_ALWAYS : null );
+
+        session.setNotFoundCachingEnabled( !request.isUpdateSnapshots() );
+        session.setTransferErrorCachingEnabled( !request.isUpdateSnapshots() );
+
+        session.setArtifactTypeRegistry( RepositoryUtils.newArtifactTypeRegistry( artifactHandlerManager ) );
+
+        LocalRepository localRepo = new LocalRepository( request.getLocalRepository().getBasedir() );
+        session.setLocalRepositoryManager( repoSystem.newLocalRepositoryManager( localRepo ) );
+
+        session.setWorkspaceReader( workspaceRepository );
+
+        DefaultSettingsDecryptionRequest decrypt = new DefaultSettingsDecryptionRequest();
+        decrypt.setProxies( request.getProxies() );
+        decrypt.setServers( request.getServers() );
+        SettingsDecryptionResult decrypted = settingsDecrypter.decrypt( decrypt );
+
+        if ( logger.isDebugEnabled() )
+        {
+            for ( SettingsProblem problem : decrypted.getProblems() )
+            {
+                logger.debug( problem.getMessage(), problem.getException() );
+            }
+        }
+
+        DefaultMirrorSelector mirrorSelector = new DefaultMirrorSelector();
+        for ( Mirror mirror : request.getMirrors() )
+        {
+            mirrorSelector.add( mirror.getId(), mirror.getUrl(), mirror.getLayout(), false, mirror.getMirrorOf(),
+                                mirror.getMirrorOfLayouts() );
+        }
+        session.setMirrorSelector( mirrorSelector );
+
+        DefaultProxySelector proxySelector = new DefaultProxySelector();
+        for ( Proxy proxy : decrypted.getProxies() )
+        {
+            Authentication proxyAuth = new Authentication( proxy.getUsername(), proxy.getPassword() );
+            proxySelector.add( new org.sonatype.aether.repository.Proxy( proxy.getProtocol(), proxy.getHost(), proxy.getPort(),
+                                                                proxyAuth ), proxy.getNonProxyHosts() );
+        }
+        session.setProxySelector( proxySelector );
+
+        DefaultAuthenticationSelector authSelector = new DefaultAuthenticationSelector();
+        for ( Server server : decrypted.getServers() )
+        {
+            Authentication auth =
+                new Authentication( server.getUsername(), server.getPassword(), server.getPrivateKey(),
+                                    server.getPassphrase() );
+            authSelector.add( server.getId(), auth );
+        }
+        session.setAuthenticationSelector( authSelector );
+
+        DependencyTraverser depTraverser = new FatArtifactTraverser();
+        session.setDependencyTraverser( depTraverser );
+
+        DependencyManager depManager = new ClassicDependencyManager();
+        session.setDependencyManager( depManager );
+
+        DependencySelector depFilter =
+            new AndDependencySelector( new ScopeDependencySelector( "test", "provided" ), new OptionalDependencySelector(),
+                                     new ExclusionDependencySelector() );
+        session.setDependencySelector( depFilter );
+
+        DependencyGraphTransformer transformer =
+            new ChainedDependencyGraphTransformer( new ConflictMarker(), new JavaEffectiveScopeCalculator(),
+                                                   new NearestVersionConflictResolver(),
+                                                   new JavaDependencyContextRefiner() );
+        session.setDependencyGraphTransformer( transformer );
+
+        session.setTransferListener( request.getTransferListener() );
+
+        session.setRepositoryListener( new AbstractRepositoryListener()
+        {
+            @Override
+            public void artifactInstalling( RepositoryEvent event )
+            {
+                logger.info( "Installing " + event.getArtifact().getFile() + " to " + event.getFile() );
+            }
+
+            @Override
+            public void metadataInstalling( RepositoryEvent event )
+            {
+                logger.debug( "Installing " + event.getMetadata() + " to " + event.getFile() );
+            }
+
+            @Override
+            public void artifactDescriptorInvalid( RepositoryEvent event )
+            {
+                if ( logger.isDebugEnabled() )
+                {
+                    logger.warn( "The POM for " + event.getArtifact() + " is invalid"
+                        + ", transitive dependencies (if any) will not be available: "
+                        + event.getException().getMessage() );
+                }
+                else
+                {
+                    logger.warn( "The POM for " + event.getArtifact() + " is invalid"
+                        + ", transitive dependencies (if any) will not be available"
+                        + ", enable debug logging for more details" );
+                }
+            }
+
+            @Override
+            public void artifactDescriptorMissing( RepositoryEvent event )
+            {
+                logger.warn( "The POM for " + event.getArtifact() + " is missing, no dependency information available" );
+            }
+        } );
+
+        return session;
+    }
+
     @SuppressWarnings({"ResultOfMethodCallIgnored"})
     private void validateLocalRepository( MavenExecutionRequest request )
         throws LocalRepositoryNotAccessibleException
@@ -405,8 +589,7 @@ public class DefaultMaven
     {
         ProjectBuildingRequest projectBuildingRequest = request.getProjectBuildingRequest();
 
-        List<ProjectBuildingResult> results =
-            projectBuilder.build( files, request.isRecursive(), projectBuildingRequest );
+        List<ProjectBuildingResult> results = projectBuilder.build( files, request.isRecursive(), projectBuildingRequest );
 
         boolean problems = false;
 
@@ -423,8 +606,7 @@ public class DefaultMaven
                 for ( ModelProblem problem : result.getProblems() )
                 {
                     String location = ModelProblemUtils.formatLocation( problem, result.getProjectId() );
-                    logger.warn( problem.getMessage()
-                                 + ( StringUtils.isNotEmpty( location ) ? " @ " + location : "" ) );
+                    logger.warn( problem.getMessage() + ( StringUtils.isNotEmpty( location ) ? " @ " + location : "" ) );
                 }
 
                 problems = true;

maven-core/src/main/java/org/apache/maven/DefaultProjectDependenciesResolver.java

@@ -97,15 +97,15 @@ public class DefaultProjectDependenciesResolver
             return resolved;
         }
 
-        if ( ( scopesToCollect == null || scopesToCollect.isEmpty() )
-            && ( scopesToResolve == null || scopesToResolve.isEmpty() ) )
+        if ( ( scopesToCollect == null || scopesToCollect.isEmpty() ) &&
+            ( scopesToResolve == null || scopesToResolve.isEmpty() ) )
         {
             return resolved;
         }
 
         /*
 
-        Logic for transitive global exclusions
+        Logic for transitve global exclusions
 
         List<String> exclusions = new ArrayList<String>();
 
@@ -126,8 +126,7 @@ public class DefaultProjectDependenciesResolver
 
         if ( ! exclusions.isEmpty() )
         {
-            filter = new AndArtifactFilter( Arrays.asList( new ArtifactFilter[]{ new ExcludesArtifactFilter( exclusions ),
-                                                                                 scopeFilter } ) );
+            filter = new AndArtifactFilter( Arrays.asList( new ArtifactFilter[]{ new ExcludesArtifactFilter( exclusions ), scopeFilter } ) );
         }
         else
         {
@@ -141,11 +140,10 @@ public class DefaultProjectDependenciesResolver
         collectionScopeFilter = new CumulativeScopeArtifactFilter( collectionScopeFilter, resolutionScopeFilter );
 
         ArtifactResolutionRequest request =
-            new ArtifactResolutionRequest().setResolveRoot( false ).setResolveTransitively( true )
-                .setCollectionFilter( collectionScopeFilter ).setResolutionFilter( resolutionScopeFilter )
-                .setLocalRepository( session.getLocalRepository() ).setOffline( session.isOffline() )
-                .setForceUpdate( session.getRequest().isUpdateSnapshots() ).setCache( session.getRepositoryCache() );
-        request.setTransferListener( session.getRequest().getTransferListener() );
+            new ArtifactResolutionRequest().setResolveRoot( false ).setResolveTransitively( true ).setCollectionFilter(
+                collectionScopeFilter ).setResolutionFilter( resolutionScopeFilter ).setLocalRepository(
+                session.getLocalRepository() ).setOffline( session.isOffline() ).setForceUpdate(
+                session.getRequest().isUpdateSnapshots() );
         request.setServers( session.getRequest().getServers() );
         request.setMirrors( session.getRequest().getMirrors() );
         request.setProxies( session.getRequest().getProxies() );

maven-core/src/main/java/org/apache/maven/ReactorReader.java

@@ -19,39 +19,40 @@ package org.apache.maven;
  * under the License.
  */
 
-import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.ArtifactUtils;
 import org.apache.maven.project.MavenProject;
-import org.apache.maven.repository.LocalArtifactRepository;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.repository.WorkspaceReader;
+import org.sonatype.aether.repository.WorkspaceRepository;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 
 /**
- * An implementation of a repository that knows how to search the Maven reactor for artifacts.
+ * An implementation of a workspace reader that knows how to search the Maven reactor for artifacts.
  * 
  * @author Jason van Zyl
  */
-public class ReactorArtifactRepository
-    extends LocalArtifactRepository
+class ReactorReader
+    implements WorkspaceReader
 {
 
     private Map<String, MavenProject> projectsByGAV;
 
     private Map<String, List<MavenProject>> projectsByGA;
 
-    private final int hashCode;
+    private WorkspaceRepository repository;
 
     @SuppressWarnings( { "ConstantConditions" } )
-    public ReactorArtifactRepository( Map<String, MavenProject> reactorProjects )
+    public ReactorReader( Map<String, MavenProject> reactorProjects )
     {
         projectsByGAV = reactorProjects;
-        hashCode = ( reactorProjects != null ) ? reactorProjects.keySet().hashCode() : 0;
 
         projectsByGA = new HashMap<String, List<MavenProject>>( reactorProjects.size() * 2 );
         for ( MavenProject project : reactorProjects.values() )
@@ -68,35 +69,18 @@ public class ReactorArtifactRepository
 
             projects.add( project );
         }
-    }
 
-    @Override
-    public Artifact find( Artifact artifact )
-    {
-        String projectKey = ArtifactUtils.key( artifact );
-
-        MavenProject project = projectsByGAV.get( projectKey );
-
-        if ( project != null )
-        {
-            File file = find( project, artifact );
-            if ( file != null )
-            {
-                resolve( artifact, file );
-            }
-        }
-
-        return artifact;
+        repository = new WorkspaceRepository( "reactor", new HashSet<String>( projectsByGAV.keySet() ) );
     }
 
     private File find( MavenProject project, Artifact artifact )
     {
-        if ( "pom".equals( artifact.getType() ) )
+        if ( "pom".equals( artifact.getExtension() ) )
         {
             return project.getFile();
         }
 
-        Artifact projectArtifact = findMatchingArtifact( project, artifact );
+        org.apache.maven.artifact.Artifact projectArtifact = findMatchingArtifact( project, artifact );
 
         if ( hasArtifactFileFromPackagePhase( projectArtifact ) )
         {
@@ -125,24 +109,120 @@ public class ReactorArtifactRepository
         return null;
     }
 
-    private boolean hasArtifactFileFromPackagePhase( Artifact projectArtifact )
+    private boolean hasArtifactFileFromPackagePhase( org.apache.maven.artifact.Artifact projectArtifact )
     {
         return projectArtifact != null && projectArtifact.getFile() != null && projectArtifact.getFile().exists();
     }
 
-    private void resolve( Artifact artifact, File file )
+    /**
+     * Tries to resolve the specified artifact from the artifacts of the given project.
+     * 
+     * @param project The project to try to resolve the artifact from, must not be <code>null</code>.
+     * @param requestedArtifact The artifact to resolve, must not be <code>null</code>.
+     * @return The matching artifact from the project or <code>null</code> if not found.
+     */
+    private org.apache.maven.artifact.Artifact findMatchingArtifact( MavenProject project, Artifact requestedArtifact )
     {
-        artifact.setFile( file );
+        String requestedRepositoryConflictId = getConflictId( requestedArtifact );
 
-        artifact.setResolved( true );
-
-        artifact.setRepository( this );
+        org.apache.maven.artifact.Artifact mainArtifact = project.getArtifact();
+        if ( requestedRepositoryConflictId.equals( getConflictId( mainArtifact ) ) )
+        {
+            return mainArtifact;
+        }
+
+        Collection<org.apache.maven.artifact.Artifact> attachedArtifacts = project.getAttachedArtifacts();
+        if ( attachedArtifacts != null && !attachedArtifacts.isEmpty() )
+        {
+            for ( org.apache.maven.artifact.Artifact attachedArtifact : attachedArtifacts )
+            {
+                if ( requestedRepositoryConflictId.equals( getConflictId( attachedArtifact ) ) )
+                {
+                    return attachedArtifact;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Gets the repository conflict id of the specified artifact. Unlike the dependency conflict id, the repository
+     * conflict id uses the artifact file extension instead of the artifact type. Hence, the repository conflict id more
+     * closely reflects the identity of artifacts as perceived by a repository.
+     * 
+     * @param artifact The artifact, must not be <code>null</code>.
+     * @return The repository conflict id, never <code>null</code>.
+     */
+    private String getConflictId( org.apache.maven.artifact.Artifact artifact )
+    {
+        StringBuilder buffer = new StringBuilder( 128 );
+        buffer.append( artifact.getGroupId() );
+        buffer.append( ':' ).append( artifact.getArtifactId() );
+        if ( artifact.getArtifactHandler() != null )
+        {
+            buffer.append( ':' ).append( artifact.getArtifactHandler().getExtension() );
+        }
+        else
+        {
+            buffer.append( ':' ).append( artifact.getType() );
+        }
+        if ( artifact.hasClassifier() )
+        {
+            buffer.append( ':' ).append( artifact.getClassifier() );
+        }
+        return buffer.toString();
+    }
+
+    private String getConflictId( Artifact artifact )
+    {
+        StringBuilder buffer = new StringBuilder( 128 );
+        buffer.append( artifact.getGroupId() );
+        buffer.append( ':' ).append( artifact.getArtifactId() );
+        buffer.append( ':' ).append( artifact.getExtension() );
+        if ( artifact.getClassifier().length() > 0 )
+        {
+            buffer.append( ':' ).append( artifact.getClassifier() );
+        }
+        return buffer.toString();
+    }
+
+    /**
+     * Determines whether the specified artifact refers to test classes.
+     * 
+     * @param artifact The artifact to check, must not be {@code null}.
+     * @return {@code true} if the artifact refers to test classes, {@code false} otherwise.
+     */
+    private static boolean isTestArtifact( Artifact artifact )
+    {
+        if ( "test-jar".equals( artifact.getProperty( "type", "" ) ) )
+        {
+            return true;
+        }
+        else if ( "jar".equals( artifact.getExtension() ) && "tests".equals( artifact.getClassifier() ) )
+        {
+            return true;
+        }
+        return false;
+    }
+
+    public File findArtifact( Artifact artifact )
+    {
+        String projectKey = artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getVersion();
+
+        MavenProject project = projectsByGAV.get( projectKey );
+
+        if ( project != null )
+        {
+            return find( project, artifact );
+        }
+
+        return null;
     }
 
-    @Override
     public List<String> findVersions( Artifact artifact )
     {
-        String key = ArtifactUtils.versionlessKey( artifact );
+        String key = artifact.getGroupId() + ':' + artifact.getArtifactId();
 
         List<MavenProject> projects = projectsByGA.get( key );
         if ( projects == null || projects.isEmpty() )
@@ -163,148 +243,9 @@ public class ReactorArtifactRepository
         return Collections.unmodifiableList( versions );
     }
 
-    @Override
-    public String getId()
+    public WorkspaceRepository getRepository()
     {
-        return "reactor";
-    }
-
-    @Override
-    public boolean hasLocalMetadata()
-    {
-        return false;
-    }
-
-    /**
-     * Tries to resolve the specified artifact from the artifacts of the given project.
-     *
-     * @param project The project to try to resolve the artifact from, must not be <code>null</code>.
-     * @param requestedArtifact The artifact to resolve, must not be <code>null</code>.
-     * @return The matching artifact from the project or <code>null</code> if not found.
-     */
-    private Artifact findMatchingArtifact( MavenProject project, Artifact requestedArtifact )
-    {
-        String requestedDependencyConflictId = requestedArtifact.getDependencyConflictId();
-
-        // check for match with project's main artifact by dependency conflict id
-        Artifact mainArtifact = project.getArtifact();
-        if ( requestedDependencyConflictId.equals( mainArtifact.getDependencyConflictId() ) )
-        {
-            return mainArtifact;
-        }
-
-        String requestedRepositoryConflictId = getRepositoryConflictId( requestedArtifact );
-
-        // check for match with project's main artifact by repository conflict id
-        if ( requestedRepositoryConflictId.equals( getRepositoryConflictId( mainArtifact ) ) )
-        {
-            return mainArtifact;
-        }
-
-        // check for match with one of the attached artifacts
-        Collection<Artifact> attachedArtifacts = project.getAttachedArtifacts();
-        if ( attachedArtifacts != null && !attachedArtifacts.isEmpty() )
-        {
-            // first try matching by dependency conflict id
-            for ( Artifact attachedArtifact : attachedArtifacts )
-            {
-                if ( requestedDependencyConflictId.equals( attachedArtifact.getDependencyConflictId() ) )
-                {
-                    return attachedArtifact;
-                }
-            }
-
-            // next try matching by repository conflict id
-            for ( Artifact attachedArtifact : attachedArtifacts )
-            {
-                if ( requestedRepositoryConflictId.equals( getRepositoryConflictId( attachedArtifact ) ) )
-                {
-                    return attachedArtifact;
-                }
-            }
-        }
-
-        return null;
-    }
-
-    /**
-     * Gets the repository conflict id of the specified artifact. Unlike the dependency conflict id, the repository
-     * conflict id uses the artifact file extension instead of the artifact type. Hence, the repository conflict id more
-     * closely reflects the identity of artifacts as perceived by a repository.
-     *
-     * @param artifact The artifact, must not be <code>null</code>.
-     * @return The repository conflict id, never <code>null</code>.
-     */
-    private String getRepositoryConflictId( Artifact artifact )
-    {
-        StringBuilder buffer = new StringBuilder( 128 );
-        buffer.append( artifact.getGroupId() );
-        buffer.append( ':' ).append( artifact.getArtifactId() );
-        if ( artifact.getArtifactHandler() != null )
-        {
-            buffer.append( ':' ).append( artifact.getArtifactHandler().getExtension() );
-        }
-        else
-        {
-            buffer.append( ':' ).append( artifact.getType() );
-        }
-        if ( artifact.hasClassifier() )
-        {
-            buffer.append( ':' ).append( artifact.getClassifier() );
-        }
-        return buffer.toString();
-    }
-
-    /**
-     * Determines whether the specified artifact refers to test classes.
-     *
-     * @param artifact The artifact to check, must not be {@code null}.
-     * @return {@code true} if the artifact refers to test classes, {@code false} otherwise.
-     */
-    private static boolean isTestArtifact( Artifact artifact )
-    {
-        if ( "test-jar".equals( artifact.getType() ) )
-        {
-            return true;
-        }
-        else if ( "jar".equals( artifact.getType() ) && "tests".equals( artifact.getClassifier() ) )
-        {
-            return true;
-        }
-        return false;
-    }
-
-    @Override
-    public int hashCode()
-    {
-        return hashCode;
-    }
-
-    @Override
-    public boolean equals( Object obj )
-    {
-        if ( this == obj )
-        {
-            return true;
-        }
-        if ( obj == null )
-        {
-            return false;
-        }
-        if ( getClass() != obj.getClass() )
-        {
-            return false;
-        }
-
-        ReactorArtifactRepository other = (ReactorArtifactRepository) obj;
-
-        return eq( projectsByGAV.keySet(), other.projectsByGAV.keySet() );
-    }
-
-    @Override
-    public boolean isProjectAware()
-    {
-        return true;
+        return repository;
     }
 
 }

maven-core/src/main/java/org/apache/maven/RepositoryUtils.java

@@ -0,0 +1,325 @@
+package org.apache.maven;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.maven.artifact.handler.ArtifactHandler;
+import org.apache.maven.artifact.handler.DefaultArtifactHandler;
+import org.apache.maven.artifact.handler.manager.ArtifactHandlerManager;
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.artifact.ArtifactType;
+import org.sonatype.aether.artifact.ArtifactTypeRegistry;
+import org.sonatype.aether.graph.Dependency;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.graph.Exclusion;
+import org.sonatype.aether.repository.Authentication;
+import org.sonatype.aether.repository.Proxy;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.RepositoryPolicy;
+import org.sonatype.aether.util.artifact.ArtifactProperties;
+import org.sonatype.aether.util.artifact.DefaultArtifact;
+import org.sonatype.aether.util.artifact.DefaultArtifactType;
+
+/**
+ * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
+ * of the public API. In particular, this class can be changed or deleted without prior notice.
+ * 
+ * @author Benjamin Bentmann
+ */
+public class RepositoryUtils
+{
+
+    private static String nullify( String string )
+    {
+        return ( string == null || string.length() <= 0 ) ? null : string;
+    }
+
+    private static org.apache.maven.artifact.Artifact toArtifact( Dependency dependency )
+    {
+        if ( dependency == null )
+        {
+            return null;
+        }
+
+        org.apache.maven.artifact.Artifact result = toArtifact( dependency.getArtifact() );
+        result.setScope( dependency.getScope() );
+        result.setOptional( dependency.isOptional() );
+
+        return result;
+    }
+
+    public static org.apache.maven.artifact.Artifact toArtifact( Artifact artifact )
+    {
+        if ( artifact == null )
+        {
+            return null;
+        }
+
+        ArtifactHandler handler = newHandler( artifact );
+
+        /*
+         * NOTE: From Artifact.hasClassifier(), an empty string and a null both denote "no classifier". However, some
+         * plugins only check for null, so be sure to nullify an empty classifier.
+         */
+        org.apache.maven.artifact.Artifact result =
+            new org.apache.maven.artifact.DefaultArtifact( artifact.getGroupId(), artifact.getArtifactId(),
+                                                           artifact.getVersion(), null,
+                                                           artifact.getProperty( ArtifactProperties.TYPE,
+                                                                                 artifact.getExtension() ),
+                                                           nullify( artifact.getClassifier() ), handler );
+
+        result.setFile( artifact.getFile() );
+        result.setResolved( artifact.getFile() != null );
+
+        List<String> trail = new ArrayList<String>( 1 );
+        trail.add( result.getId() );
+        result.setDependencyTrail( trail );
+
+        return result;
+    }
+
+    public static void toArtifacts( Collection<org.apache.maven.artifact.Artifact> artifacts,
+                                    Collection<? extends DependencyNode> nodes, List<String> trail,
+                                    DependencyFilter filter )
+    {
+        for ( DependencyNode node : nodes )
+        {
+            org.apache.maven.artifact.Artifact artifact = toArtifact( node.getDependency() );
+
+            List<String> nodeTrail = new ArrayList<String>( trail.size() + 1 );
+            nodeTrail.addAll( trail );
+            nodeTrail.add( artifact.getId() );
+
+            if ( filter == null || filter.accept( node, Collections.<DependencyNode> emptyList() ) )
+            {
+                artifact.setDependencyTrail( nodeTrail );
+                artifacts.add( artifact );
+            }
+
+            toArtifacts( artifacts, node.getChildren(), nodeTrail, filter );
+        }
+    }
+
+    public static Artifact toArtifact( org.apache.maven.artifact.Artifact artifact )
+    {
+        if ( artifact == null )
+        {
+            return null;
+        }
+
+        String version = artifact.getVersion();
+        if ( version == null && artifact.getVersionRange() != null )
+        {
+            version = artifact.getVersionRange().toString();
+        }
+
+        Map<String, String> props = null;
+        if ( org.apache.maven.artifact.Artifact.SCOPE_SYSTEM.equals( artifact.getScope() ) )
+        {
+            props = Collections.singletonMap( ArtifactProperties.LACKS_DESCRIPTOR, Boolean.TRUE.toString() );
+        }
+
+        Artifact result =
+            new DefaultArtifact( artifact.getGroupId(), artifact.getArtifactId(), artifact.getClassifier(),
+                                 artifact.getArtifactHandler().getExtension(), version, props,
+                                 newArtifactType( artifact.getType(), artifact.getArtifactHandler() ) );
+        result = result.setFile( artifact.getFile() );
+
+        return result;
+    }
+
+    public static Dependency toDependency( org.apache.maven.artifact.Artifact artifact,
+                                           Collection<org.apache.maven.model.Exclusion> exclusions )
+    {
+        if ( artifact == null )
+        {
+            return null;
+        }
+
+        Artifact result = toArtifact( artifact );
+
+        List<Exclusion> excl = null;
+        if ( exclusions != null )
+        {
+            excl = new ArrayList<Exclusion>( exclusions.size() );
+            for ( org.apache.maven.model.Exclusion exclusion : exclusions )
+            {
+                excl.add( toExclusion( exclusion ) );
+            }
+        }
+
+        return new Dependency( result, artifact.getScope(), artifact.isOptional(), excl );
+    }
+
+    public static List<RemoteRepository> toRepos( List<ArtifactRepository> repos )
+    {
+        if ( repos == null )
+        {
+            return null;
+        }
+
+        List<RemoteRepository> results = new ArrayList<RemoteRepository>( repos.size() );
+        for ( ArtifactRepository repo : repos )
+        {
+            results.add( toRepo( repo ) );
+        }
+        return results;
+    }
+
+    public static RemoteRepository toRepo( ArtifactRepository repo )
+    {
+        RemoteRepository result = null;
+        if ( repo != null )
+        {
+            result = new RemoteRepository( repo.getId(), repo.getLayout().getId(), repo.getUrl() );
+            result.setPolicy( true, toPolicy( repo.getSnapshots() ) );
+            result.setPolicy( false, toPolicy( repo.getReleases() ) );
+            result.setAuthentication( toAuthentication( repo.getAuthentication() ) );
+            result.setProxy( toProxy( repo.getProxy() ) );
+        }
+        return result;
+    }
+
+    private static RepositoryPolicy toPolicy( ArtifactRepositoryPolicy policy )
+    {
+        RepositoryPolicy result = null;
+        if ( policy != null )
+        {
+            result = new RepositoryPolicy( policy.isEnabled(), policy.getUpdatePolicy(), policy.getChecksumPolicy() );
+        }
+        return result;
+    }
+
+    private static Authentication toAuthentication( org.apache.maven.artifact.repository.Authentication auth )
+    {
+        Authentication result = null;
+        if ( auth != null )
+        {
+            result = new Authentication( auth.getUsername(), auth.getPassword() );
+        }
+        return result;
+    }
+
+    private static Proxy toProxy( org.apache.maven.repository.Proxy proxy )
+    {
+        Proxy result = null;
+        if ( proxy != null )
+        {
+            Authentication auth = new Authentication( proxy.getUserName(), proxy.getPassword() );
+            result = new Proxy( proxy.getProtocol(), proxy.getHost(), proxy.getPort(), auth );
+        }
+        return result;
+    }
+
+    public static ArtifactHandler newHandler( Artifact artifact )
+    {
+        String type = artifact.getProperty( ArtifactProperties.TYPE, artifact.getExtension() );
+        DefaultArtifactHandler handler = new DefaultArtifactHandler( type );
+        handler.setExtension( artifact.getExtension() );
+        handler.setLanguage( artifact.getProperty( ArtifactProperties.LANGUAGE, null ) );
+        handler.setAddedToClasspath( Boolean.parseBoolean( artifact.getProperty( ArtifactProperties.CONSTITUTES_BUILD_PATH,
+                                                                                 "" ) ) );
+        handler.setIncludesDependencies( Boolean.parseBoolean( artifact.getProperty( ArtifactProperties.INCLUDES_DEPENDENCIES,
+                                                                                     "" ) ) );
+        return handler;
+    }
+
+    public static ArtifactType newArtifactType( String id, ArtifactHandler handler )
+    {
+        return new DefaultArtifactType( id, handler.getExtension(), handler.getClassifier(), handler.getLanguage(),
+                                        handler.isAddedToClasspath(), handler.isIncludesDependencies() );
+    }
+
+    public static Dependency toDependency( org.apache.maven.model.Dependency dependency,
+                                           ArtifactTypeRegistry stereotypes )
+    {
+        ArtifactType stereotype = stereotypes.get( dependency.getType() );
+        if ( stereotype == null )
+        {
+            stereotype = new DefaultArtifactType( dependency.getType() );
+        }
+
+        boolean system = dependency.getSystemPath() != null && dependency.getSystemPath().length() > 0;
+
+        Map<String, String> props = null;
+        if ( system )
+        {
+            props = Collections.singletonMap( ArtifactProperties.LACKS_DESCRIPTOR, Boolean.TRUE.toString() );
+        }
+
+        Artifact artifact =
+            new DefaultArtifact( dependency.getGroupId(), dependency.getArtifactId(), dependency.getClassifier(), null,
+                                 dependency.getVersion(), props, stereotype );
+
+        if ( system )
+        {
+            artifact = artifact.setFile( new File( dependency.getSystemPath() ) );
+        }
+
+        List<Exclusion> exclusions = new ArrayList<Exclusion>( dependency.getExclusions().size() );
+        for ( org.apache.maven.model.Exclusion exclusion : dependency.getExclusions() )
+        {
+            exclusions.add( toExclusion( exclusion ) );
+        }
+
+        Dependency result = new Dependency( artifact, dependency.getScope(), dependency.isOptional(), exclusions );
+
+        return result;
+    }
+
+    private static Exclusion toExclusion( org.apache.maven.model.Exclusion exclusion )
+    {
+        return new Exclusion( exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*" );
+    }
+
+    public static ArtifactTypeRegistry newArtifactTypeRegistry( ArtifactHandlerManager handlerManager )
+    {
+        return new MavenArtifactTypeRegistry( handlerManager );
+    }
+
+    static class MavenArtifactTypeRegistry
+        implements ArtifactTypeRegistry
+    {
+
+        private final ArtifactHandlerManager handlerManager;
+
+        public MavenArtifactTypeRegistry( ArtifactHandlerManager handlerManager )
+        {
+            this.handlerManager = handlerManager;
+        }
+
+        public ArtifactType get( String stereotypeId )
+        {
+            ArtifactHandler handler = handlerManager.getArtifactHandler( stereotypeId );
+            return newArtifactType( stereotypeId, handler );
+        }
+
+    }
+
+}

maven-core/src/main/java/org/apache/maven/artifact/handler/DefaultArtifactHandler.java

@@ -64,6 +64,11 @@ public class DefaultArtifactHandler
         return extension;
     }
 
+    public void setExtension( String extension )
+    {
+        this.extension = extension;
+    }
+
     public String getType()
     {
         return type;
@@ -97,6 +102,11 @@ public class DefaultArtifactHandler
         return includesDependencies;
     }
 
+    public void setIncludesDependencies( boolean includesDependencies )
+    {
+        this.includesDependencies = includesDependencies;
+    }
+
     public String getLanguage()
     {
         if ( language == null )
@@ -107,8 +117,19 @@ public class DefaultArtifactHandler
         return language;
     }
 
+    public void setLanguage( String language )
+    {
+        this.language = language;
+    }
+
     public boolean isAddedToClasspath()
     {
         return addedToClasspath;
     }
+
+    public void setAddedToClasspath( boolean addedToClasspath )
+    {
+        this.addedToClasspath = addedToClasspath;
+    }
+
 }

maven-core/src/main/java/org/apache/maven/artifact/repository/DefaultRepositoryRequest.java

@@ -24,7 +24,6 @@ import java.util.List;
 
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.project.MavenProject;
-import org.apache.maven.repository.ArtifactTransferListener;
 
 /**
  * Collects basic settings to access the repository system.
@@ -43,10 +42,6 @@ public class DefaultRepositoryRequest
 
     private List<ArtifactRepository> remoteRepositories;
 
-    private RepositoryCache cache;
-
-    private ArtifactTransferListener transferListener;
-
     /**
      * Creates an empty repository request.
      */
@@ -65,16 +60,13 @@ public class DefaultRepositoryRequest
         setLocalRepository( repositoryRequest.getLocalRepository() );
         setRemoteRepositories( repositoryRequest.getRemoteRepositories() );
         setOffline( repositoryRequest.isOffline() );
-        setCache( repositoryRequest.getCache() );
         setForceUpdate( repositoryRequest.isForceUpdate() );
-        setTransferListener( repositoryRequest.getTransferListener() );
     }
 
     public static RepositoryRequest getRepositoryRequest( MavenSession session, MavenProject project )
     {
         RepositoryRequest request = new DefaultRepositoryRequest();
 
-        request.setCache( session.getRepositoryCache() );
         request.setLocalRepository( session.getLocalRepository() );
         if ( project != null )
         {
@@ -82,7 +74,6 @@ public class DefaultRepositoryRequest
         }
         request.setOffline( session.isOffline() );
         request.setForceUpdate( session.getRequest().isUpdateSnapshots() );
-        request.setTransferListener( session.getRequest().getTransferListener() );
 
         return request;
     }
@@ -140,28 +131,4 @@ public class DefaultRepositoryRequest
         return this;
     }
 
-    public RepositoryCache getCache()
-    {
-        return cache;
-    }
-
-    public DefaultRepositoryRequest setCache( RepositoryCache cache )
-    {
-        this.cache = cache;
-
-        return this;
-    }
-
-    public ArtifactTransferListener getTransferListener()
-    {
-        return transferListener;
-    }
-
-    public DefaultRepositoryRequest setTransferListener( ArtifactTransferListener transferListener )
-    {
-        this.transferListener = transferListener;
-
-        return this;
-    }
-
 }

maven-core/src/main/java/org/apache/maven/artifact/repository/RepositoryCache.java

@@ -25,6 +25,7 @@ package org.apache.maven.artifact.repository;
  * 
  * @author Benjamin Bentmann
  */
+@Deprecated
 public interface RepositoryCache
 {
 

maven-core/src/main/java/org/apache/maven/artifact/repository/RepositoryRequest.java

@@ -21,8 +21,6 @@ package org.apache.maven.artifact.repository;
 
 import java.util.List;
 
-import org.apache.maven.repository.ArtifactTransferListener;
-
 /**
  * Collects basic settings to access the repository system.
  * 
@@ -94,34 +92,4 @@ public interface RepositoryRequest
      */
     RepositoryRequest setRemoteRepositories( List<ArtifactRepository> remoteRepositories );
 
-    /**
-     * Gets the repository cache to use.
-     * 
-     * @return The repository cache to use or {@code null} if none.
-     */
-    RepositoryCache getCache();
-
-    /**
-     * Sets the repository cache to use.
-     * 
-     * @param cache The repository cache to use, may be {@code null}.
-     * @return This request, never {@code null}.
-     */
-    RepositoryRequest setCache( RepositoryCache cache );
-
-    /**
-     * Gets the listener to notify of transfer events.
-     * 
-     * @return The transfer listener or {@code null} if none.
-     */
-    ArtifactTransferListener getTransferListener();
-
-    /**
-     * Sets the listener to notify of transfer events.
-     * 
-     * @param transferListener The transfer listener to notify, may be {@code null}.
-     * @return This request, never {@code null}.
-     */
-    RepositoryRequest setTransferListener( ArtifactTransferListener transferListener );
-
 }

maven-core/src/main/java/org/apache/maven/artifact/resolver/ArtifactResolutionRequest.java

@@ -29,7 +29,6 @@ import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.repository.RepositoryCache;
 import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
-import org.apache.maven.repository.ArtifactTransferListener;
 import org.apache.maven.settings.Mirror;
 import org.apache.maven.settings.Proxy;
 import org.apache.maven.settings.Server;
@@ -55,8 +54,6 @@ public class ArtifactResolutionRequest
 
     private List<ArtifactRepository> remoteRepositories;
 
-    private RepositoryCache cache;
-
     private ArtifactFilter collectionFilter;
 
     private ArtifactFilter resolutionFilter;
@@ -67,8 +64,6 @@ public class ArtifactResolutionRequest
     // This is like a filter but overrides all transitive versions 
     private Map managedVersionMap;
     
-    private ArtifactTransferListener transferListener;
-    
     private boolean resolveRoot = true;
 
     private boolean resolveTransitively = false;
@@ -92,10 +87,8 @@ public class ArtifactResolutionRequest
     {
         setLocalRepository( request.getLocalRepository() );
         setRemoteRepositories( request.getRemoteRepositories() );
-        setCache( request.getCache() );
         setOffline( request.isOffline() );
         setForceUpdate( request.isForceUpdate() );
-        setTransferListener( request.getTransferListener() );
     }
 
     public Artifact getArtifact()
@@ -238,17 +231,6 @@ public class ArtifactResolutionRequest
         return resolveTransitively;
     }        
 
-    public ArtifactTransferListener getTransferListener()
-    {
-        return transferListener;
-    }
-
-    public ArtifactResolutionRequest setTransferListener( ArtifactTransferListener transferListener )
-    {
-        this.transferListener = transferListener;
-        return this;
-    }
-
     public String toString()
     {
         StringBuilder sb = new StringBuilder()
@@ -263,13 +245,11 @@ public class ArtifactResolutionRequest
 
     public RepositoryCache getCache()
     {
-        return cache;
+        return null;
     }
 
     public ArtifactResolutionRequest setCache( RepositoryCache cache )
     {
-        this.cache = cache;
-
         return this;
     }
 

maven-core/src/main/java/org/apache/maven/classrealm/ArtifactClassRealmConstituent.java

@@ -21,7 +21,7 @@ package org.apache.maven.classrealm;
 
 import java.io.File;
 
-import org.apache.maven.artifact.Artifact;
+import org.sonatype.aether.artifact.Artifact;
 
 /**
  * @author Benjamin Bentmann
@@ -49,12 +49,12 @@ class ArtifactClassRealmConstituent
 
     public String getType()
     {
-        return artifact.getType();
+        return artifact.getExtension();
     }
 
     public String getClassifier()
     {
-        return artifact.hasClassifier() ? artifact.getClassifier() : "";
+        return artifact.getClassifier();
     }
 
     public String getVersion()
@@ -70,7 +70,7 @@ class ArtifactClassRealmConstituent
     @Override
     public String toString()
     {
-        return artifact.getId();
+        return artifact.toString();
     }
 
 }

maven-core/src/main/java/org/apache/maven/classrealm/ClassRealmManager.java

@@ -21,10 +21,10 @@ package org.apache.maven.classrealm;
 
 import java.util.List;
 
-import org.apache.maven.artifact.Artifact;
 import org.apache.maven.model.Model;
 import org.apache.maven.model.Plugin;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.sonatype.aether.artifact.Artifact;
 
 /**
  * Manages the class realms used by Maven. <strong>Warning:</strong> This is an internal utility interface that is only

maven-core/src/main/java/org/apache/maven/classrealm/DefaultClassRealmManager.java

@@ -28,7 +28,6 @@ import java.util.List;
 import java.util.Random;
 import java.util.Set;
 
-import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.ArtifactUtils;
 import org.apache.maven.classrealm.ClassRealmRequest.RealmType;
 import org.apache.maven.model.Model;
@@ -43,11 +42,12 @@ import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
 import org.codehaus.plexus.logging.Logger;
 import org.codehaus.plexus.util.StringUtils;
+import org.sonatype.aether.artifact.Artifact;
 
 /**
  * Manages the class realms used by Maven. <strong>Warning:</strong> This is an internal utility class that is only
- * public for technical reasons, it is not part of the public API. In particular, this interface can be changed or
- * deleted without prior notice.
+ * public for technical reasons, it is not part of the public API. In particular, this class can be changed or deleted
+ * without prior notice.
  * 
  * @author Benjamin Bentmann
  */
@@ -133,7 +133,7 @@ public class DefaultClassRealmManager
         {
             for ( Artifact artifact : artifacts )
             {
-                artifactIds.add( artifact.getId() );
+                artifactIds.add( getId( artifact ) );
                 if ( artifact.getFile() != null )
                 {
                     constituents.add( new ArtifactClassRealmConstituent( artifact ) );
@@ -260,6 +260,9 @@ public class DefaultClassRealmManager
         // maven-*
         importingRealm.importFrom( coreRealm, "org.apache.maven" );
 
+        // aether
+        importingRealm.importFrom( coreRealm, "org.sonatype.aether" );
+
         // plexus-classworlds
         importingRealm.importFrom( coreRealm, "org.codehaus.plexus.classworlds" );
 
@@ -334,11 +337,21 @@ public class DefaultClassRealmManager
             + version;
     }
 
+    private static String getId( Artifact artifact )
+    {
+        return getId( artifact.getGroupId(), artifact.getArtifactId(), artifact.getExtension(), artifact.getClassifier(),
+                      artifact.getBaseVersion() );
+    }
+
     private static String getId( ClassRealmConstituent constituent )
     {
-        return constituent.getGroupId() + ':' + constituent.getArtifactId() + ':' + constituent.getType()
-            + ( StringUtils.isNotEmpty( constituent.getClassifier() ) ? ':' + constituent.getClassifier() : "" ) + ':'
-            + constituent.getVersion();
+        return getId( constituent.getGroupId(), constituent.getArtifactId(), constituent.getType(),
+                      constituent.getClassifier(), constituent.getVersion() );
+    }
+
+    private static String getId( String gid, String aid, String type, String cls, String ver )
+    {
+        return gid + ':' + aid + ':' + type + ( StringUtils.isNotEmpty( cls ) ? ':' + cls : "" ) + ':' + ver;
     }
 
     private List<ClassRealmManagerDelegate> getDelegates()

maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionRequest.java

@@ -26,14 +26,15 @@ import java.util.List;
 import java.util.Properties;
 
 import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.RepositoryCache;
 import org.apache.maven.model.Profile;
 import org.apache.maven.project.DefaultProjectBuildingRequest;
 import org.apache.maven.project.ProjectBuildingRequest;
-import org.apache.maven.repository.ArtifactTransferListener;
 import org.apache.maven.settings.Mirror;
 import org.apache.maven.settings.Proxy;
 import org.apache.maven.settings.Server;
+import org.sonatype.aether.RepositoryCache;
+import org.sonatype.aether.transfer.TransferListener;
+import org.sonatype.aether.util.DefaultRepositoryCache;
 
 /**
  * @author Jason van Zyl
@@ -42,7 +43,7 @@ public class DefaultMavenExecutionRequest
     implements MavenExecutionRequest
 {
 
-    private RepositoryCache repositoryCache = new SessionRepositoryCache();
+    private RepositoryCache repositoryCache = new DefaultRepositoryCache();
 
     private ArtifactRepository localRepository;
 
@@ -110,7 +111,7 @@ public class DefaultMavenExecutionRequest
 
     private List<String> inactiveProfiles;
 
-    private ArtifactTransferListener transferListener;
+    private TransferListener transferListener;
 
     private int loggingLevel = LOGGING_LEVEL_INFO;
 
@@ -350,7 +351,7 @@ public class DefaultMavenExecutionRequest
         return inactiveProfiles;
     }
 
-    public ArtifactTransferListener getTransferListener()
+    public TransferListener getTransferListener()
     {
         return transferListener;
     }
@@ -592,7 +593,7 @@ public class DefaultMavenExecutionRequest
         return this;
     }
 
-    public MavenExecutionRequest setTransferListener( ArtifactTransferListener transferListener )
+    public MavenExecutionRequest setTransferListener( TransferListener transferListener )
     {
         this.transferListener = transferListener;
 
@@ -953,7 +954,6 @@ public class DefaultMavenExecutionRequest
             projectBuildingRequest.setUserProperties( getUserProperties() );
             projectBuildingRequest.setRemoteRepositories( getRemoteRepositories() );
             projectBuildingRequest.setPluginArtifactRepositories( getPluginArtifactRepositories() );
-            projectBuildingRequest.setRepositoryCache( getRepositoryCache() );
             projectBuildingRequest.setOffline( isOffline() );
             projectBuildingRequest.setForceUpdate( isUpdateSnapshots() );
             projectBuildingRequest.setServers( getServers() );
@@ -964,7 +964,6 @@ public class DefaultMavenExecutionRequest
             projectBuildingRequest.setProfiles( getProfiles() );
             projectBuildingRequest.setProcessPlugins( true );
             projectBuildingRequest.setBuildStartTime( getStartTime() );
-            projectBuildingRequest.setTransferListener( getTransferListener() );
         }
 
         return projectBuildingRequest;

maven-core/src/main/java/org/apache/maven/execution/DefaultMavenExecutionResult.java

@@ -25,7 +25,7 @@ import java.util.IdentityHashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
+import org.apache.maven.project.DependencyResolutionResult;
 import org.apache.maven.project.MavenProject;
 
 /** @author Jason van Zyl */
@@ -36,7 +36,7 @@ public class DefaultMavenExecutionResult
 
     private List<MavenProject> topologicallySortedProjects;
 
-    private ArtifactResolutionResult artifactResolutionResult;
+    private DependencyResolutionResult dependencyResolutionResult;
 
     private List<Throwable> exceptions;
 
@@ -66,14 +66,14 @@ public class DefaultMavenExecutionResult
         return topologicallySortedProjects;
     }
 
-    public ArtifactResolutionResult getArtifactResolutionResult()
+    public DependencyResolutionResult getDependencyResolutionResult()
     {
-        return artifactResolutionResult;
+        return dependencyResolutionResult;
     }
 
-    public MavenExecutionResult setArtifactResolutionResult( ArtifactResolutionResult artifactResolutionResult )
+    public MavenExecutionResult setDependencyResolutionResult( DependencyResolutionResult dependencyResolutionResult )
     {
-        this.artifactResolutionResult = artifactResolutionResult;
+        this.dependencyResolutionResult = dependencyResolutionResult;
 
         return this;
     }

maven-core/src/main/java/org/apache/maven/execution/MavenExecutionRequest.java

@@ -26,14 +26,14 @@ import java.util.Properties;
 
 import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
-import org.apache.maven.artifact.repository.RepositoryCache;
 import org.apache.maven.model.Profile;
 import org.apache.maven.project.ProjectBuildingRequest;
-import org.apache.maven.repository.ArtifactTransferListener;
 import org.apache.maven.settings.Mirror;
 import org.apache.maven.settings.Proxy;
 import org.apache.maven.settings.Server;
 import org.codehaus.plexus.logging.Logger;
+import org.sonatype.aether.RepositoryCache;
+import org.sonatype.aether.transfer.TransferListener;
 
 /**
  * @author Jason van Zyl
@@ -170,8 +170,8 @@ public interface MavenExecutionRequest
     boolean isShowErrors();
 
     // Transfer listeners
-    MavenExecutionRequest setTransferListener( ArtifactTransferListener transferListener );
-    ArtifactTransferListener getTransferListener();
+    MavenExecutionRequest setTransferListener( TransferListener transferListener );
+    TransferListener getTransferListener();
 
     // Logging
     MavenExecutionRequest setLoggingLevel( int loggingLevel );

maven-core/src/main/java/org/apache/maven/execution/MavenExecutionResult.java

@@ -21,7 +21,7 @@ package org.apache.maven.execution;
 
 import java.util.List;
 
-import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
+import org.apache.maven.project.DependencyResolutionResult;
 import org.apache.maven.project.MavenProject;
 
 /**
@@ -35,8 +35,8 @@ public interface MavenExecutionResult
     MavenExecutionResult setTopologicallySortedProjects( List<MavenProject> projects );
     List<MavenProject> getTopologicallySortedProjects();
 
-    MavenExecutionResult setArtifactResolutionResult( ArtifactResolutionResult result );
-    ArtifactResolutionResult getArtifactResolutionResult();
+    MavenExecutionResult setDependencyResolutionResult( DependencyResolutionResult result );
+    DependencyResolutionResult getDependencyResolutionResult();
 
     // for each exception
     // - knowing what artifacts are missing

maven-core/src/main/java/org/apache/maven/execution/MavenSession.java

@@ -36,6 +36,7 @@ import org.apache.maven.project.ProjectBuildingRequest;
 import org.apache.maven.settings.Settings;
 import org.codehaus.plexus.PlexusContainer;
 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
+import org.sonatype.aether.RepositorySystemSession;
 
 /**
  * @author Jason van Zyl
@@ -50,6 +51,8 @@ public class MavenSession
 
     private MavenExecutionResult result;
 
+    private RepositorySystemSession repositorySession;
+
     private final Settings settings;
 
     private Properties executionProperties;
@@ -115,12 +118,14 @@ public class MavenSession
         setProjects( projects );
     }
 
-    public MavenSession( PlexusContainer container, MavenExecutionRequest request, MavenExecutionResult result )
+    public MavenSession( PlexusContainer container, RepositorySystemSession repositorySession, MavenExecutionRequest request,
+                         MavenExecutionResult result )
     {
         this.container = container;
         this.request = request;
         this.result = result;
         this.settings = new SettingsAdapter( request );
+        this.repositorySession = repositorySession;
     }
 
     public void setProjects( List<MavenProject> projects )
@@ -180,9 +185,10 @@ public class MavenSession
         return container.lookupMap( role );
     }
 
+    @Deprecated
     public RepositoryCache getRepositoryCache()
     {
-        return request.getRepositoryCache();
+        return null;
     }
 
     public ArtifactRepository getLocalRepository()
@@ -277,7 +283,7 @@ public class MavenSession
 
     public ProjectBuildingRequest getProjectBuildingRequest()
     {
-        return request.getProjectBuildingRequest();
+        return request.getProjectBuildingRequest().setRepositorySession( getRepositorySession() );
     }
 
     public List<String> getPluginGroups()
@@ -382,4 +388,10 @@ public class MavenSession
     {
         this.parallel = parallel;
     }
+
+    public RepositorySystemSession getRepositorySession()
+    {
+        return repositorySession;
+    }
+
 }

maven-core/src/main/java/org/apache/maven/lifecycle/DefaultSchedules.java

@@ -21,14 +21,7 @@ package org.apache.maven.lifecycle;
 
 import org.apache.maven.lifecycle.internal.BuilderCommon;
 import org.apache.maven.lifecycle.internal.ExecutionPlanItem;
-import org.apache.maven.plugin.InvalidPluginDescriptorException;
 import org.apache.maven.plugin.MojoExecution;
-import org.apache.maven.plugin.MojoNotFoundException;
-import org.apache.maven.plugin.PluginDescriptorParsingException;
-import org.apache.maven.plugin.PluginNotFoundException;
-import org.apache.maven.plugin.PluginResolutionException;
-import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
-import org.apache.maven.plugin.version.PluginVersionResolutionException;
 import org.apache.maven.project.MavenProject;
 
 import java.util.ArrayList;
@@ -55,9 +48,6 @@ public class DefaultSchedules
     }
 
     public List<ExecutionPlanItem> createExecutionPlanItem( MavenProject mavenProject, List<MojoExecution> executions )
-        throws PluginNotFoundException, PluginResolutionException, LifecyclePhaseNotFoundException,
-        PluginDescriptorParsingException, MojoNotFoundException, InvalidPluginDescriptorException,
-        NoPluginFoundForPrefixException, LifecycleNotFoundException, PluginVersionResolutionException
     {
         BuilderCommon.attachToThread( mavenProject );
 

maven-core/src/main/java/org/apache/maven/lifecycle/internal/DefaultLifecycleExecutionPlanCalculator.java

@@ -1,25 +1,19 @@
-package org.apache.maven.lifecycle.internal;
-
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
+package org.apache.maven.lifecycle.internal;
 
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.lifecycle.DefaultLifecycles;
 import org.apache.maven.lifecycle.DefaultSchedules;
@@ -147,9 +141,10 @@ public class DefaultLifecycleExecutionPlanCalculator
 
             if ( mojoDescriptor == null )
             {
-                mojoDescriptor = pluginManager.getMojoDescriptor( mojoExecution.getPlugin(), mojoExecution.getGoal(),
-                                                                  DefaultRepositoryRequest.getRepositoryRequest(
-                                                                      session, project ) );
+                mojoDescriptor =
+                    pluginManager.getMojoDescriptor( mojoExecution.getPlugin(), mojoExecution.getGoal(),
+                                                     project.getRemotePluginRepositories(),
+                                                     session.getRepositorySession() );
 
                 mojoExecution.setMojoDescriptor( mojoDescriptor );
             }
@@ -251,10 +246,11 @@ public class DefaultLifecycleExecutionPlanCalculator
 
         if ( lifecycle == null )
         {
-            throw new LifecyclePhaseNotFoundException( "Unknown lifecycle phase \"" + lifecyclePhase
-                + "\". You must specify a valid lifecycle phase" + " or a goal in the format <plugin-prefix>:<goal> or"
-                + " <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: "
-                + defaultLifeCycles.getLifecyclePhaseList() + ".", lifecyclePhase );
+            throw new LifecyclePhaseNotFoundException(
+                "Unknown lifecycle phase \"" + lifecyclePhase + "\". You must specify a valid lifecycle phase" +
+                    " or a goal in the format <plugin-prefix>:<goal> or" +
+                    " <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: " +
+                    defaultLifeCycles.getLifecyclePhaseList() + ".", lifecyclePhase );
         }
 
         /*
@@ -309,9 +305,8 @@ public class DefaultLifecycleExecutionPlanCalculator
                     for ( String goal : execution.getGoals() )
                     {
                         MojoDescriptor mojoDescriptor =
-                            pluginManager.getMojoDescriptor( plugin, goal,
-                                                             DefaultRepositoryRequest.getRepositoryRequest( session,
-                                                                                                            project ) );
+                            pluginManager.getMojoDescriptor( plugin, goal, project.getRemotePluginRepositories(),
+                                                             session.getRepositorySession() );
 
                         Map<Integer, List<MojoExecution>> phaseBindings = mappings.get( mojoDescriptor.getPhase() );
                         if ( phaseBindings != null )
@@ -464,8 +459,8 @@ public class DefaultLifecycleExecutionPlanCalculator
                 {
                     parameterConfiguration = new Xpp3Dom( parameterConfiguration, parameter.getName() );
 
-                    if ( StringUtils.isEmpty( parameterConfiguration.getAttribute( "implementation" ) )
-                        && StringUtils.isNotEmpty( parameter.getImplementation() ) )
+                    if ( StringUtils.isEmpty( parameterConfiguration.getAttribute( "implementation" ) ) &&
+                        StringUtils.isNotEmpty( parameter.getImplementation() ) )
                     {
                         parameterConfiguration.setAttribute( "implementation", parameter.getImplementation() );
                     }
@@ -489,6 +484,7 @@ public class DefaultLifecycleExecutionPlanCalculator
         LifecyclePhaseNotFoundException, LifecycleNotFoundException, PluginVersionResolutionException
     {
             calculateForkedExecutions( mojoExecution, session, session.getCurrentProject(), new HashSet<MojoDescriptor>() );
+
     }
 
 
@@ -556,8 +552,8 @@ public class DefaultLifecycleExecutionPlanCalculator
                 {
                     MojoDescriptor forkedMojoDescriptor =
                         pluginManager.getMojoDescriptor( forkedExecution.getPlugin(), forkedExecution.getGoal(),
-                                                         DefaultRepositoryRequest.getRepositoryRequest( session,
-                                                                                                        project ) );
+                                                         project.getRemotePluginRepositories(),
+                                                         session.getRepositorySession() );
 
                     forkedExecution.setMojoDescriptor( forkedMojoDescriptor );
                 }

maven-core/src/main/java/org/apache/maven/lifecycle/internal/LifecycleDependencyResolver.java

@@ -1,39 +1,41 @@
 package org.apache.maven.lifecycle.internal;
 
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under                    
+ * the License.
  */
 
-import org.apache.maven.ProjectDependenciesResolver;
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
 import org.apache.maven.artifact.ArtifactUtils;
 import org.apache.maven.artifact.factory.ArtifactFactory;
-import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
-import org.apache.maven.artifact.resolver.ArtifactResolutionException;
-import org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.lifecycle.LifecycleExecutionException;
 import org.apache.maven.lifecycle.MavenExecutionPlan;
+import org.apache.maven.project.DefaultDependencyResolutionRequest;
+import org.apache.maven.project.DependencyResolutionException;
+import org.apache.maven.project.DependencyResolutionResult;
 import org.apache.maven.project.MavenProject;
+import org.apache.maven.project.ProjectDependenciesResolver;
 import org.apache.maven.project.artifact.InvalidDependencyVersionException;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.Logger;
+import org.sonatype.aether.graph.Dependency;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.util.filter.AndDependencyFilter;
+import org.sonatype.aether.util.filter.ScopeDependencyFilter;
 
 import java.util.*;
 
@@ -50,8 +52,9 @@ import java.util.*;
 @Component(role = LifecycleDependencyResolver.class)
 public class LifecycleDependencyResolver
 {
+
     @Requirement
-    private ProjectDependenciesResolver projectDependenciesResolver;
+    private ProjectDependenciesResolver dependenciesResolver;
 
     @Requirement
     private Logger logger;
@@ -66,7 +69,7 @@ public class LifecycleDependencyResolver
 
     public LifecycleDependencyResolver( ProjectDependenciesResolver projectDependenciesResolver, Logger logger )
     {
-        this.projectDependenciesResolver = projectDependenciesResolver;
+        this.dependenciesResolver = projectDependenciesResolver;
         this.logger = logger;
     }
 
@@ -136,87 +139,112 @@ public class LifecycleDependencyResolver
         }
 
         Set<Artifact> artifacts =
-            getProjectDependencies( project, scopesToCollect, scopesToResolve, session, aggregating,
-                                    projectArtifacts );
+            getDependencies( project, scopesToCollect, scopesToResolve, session, aggregating, projectArtifacts );
 
         project.setResolvedArtifacts( artifacts );
+
+        Map<String, Artifact> map = new HashMap<String, Artifact>();
+        for ( Artifact artifact : artifacts )
+        {
+            map.put( artifact.getId(), artifact );
+        }
+        for ( Artifact artifact : project.getDependencyArtifacts() )
+        {
+            if ( artifact.getFile() == null )
+            {
+                Artifact resolved = map.get( artifact.getId() );
+                if ( resolved != null )
+                {
+                    artifact.setFile( resolved.getFile() );
+                    artifact.setDependencyTrail( resolved.getDependencyTrail() );
+                    artifact.setResolvedVersion( resolved.getVersion() );
+                    artifact.setResolved( true );
+                }
+            }
+        }
     }
 
-    private Set<Artifact> getProjectDependencies( MavenProject project, Collection<String> scopesToCollect,
+    private Set<Artifact> getDependencies( MavenProject project, Collection<String> scopesToCollect,
                                            Collection<String> scopesToResolve, MavenSession session,
                                            boolean aggregating, Set<Artifact> projectArtifacts )
         throws LifecycleExecutionException
     {
-        Set<Artifact> artifacts;
+        if ( scopesToCollect == null )
+        {
+            scopesToCollect = Collections.emptySet();
+        }
+        if ( scopesToResolve == null )
+        {
+            scopesToResolve = Collections.emptySet();
+        }
+
+        if ( scopesToCollect.isEmpty() && scopesToResolve.isEmpty() )
+        {
+            return new LinkedHashSet<Artifact>();
+        }
+
+        scopesToCollect = new HashSet<String>( scopesToCollect );
+        scopesToCollect.addAll( scopesToResolve );
+
+        DependencyFilter collectionFilter = new ScopeDependencyFilter( null, negate( scopesToCollect ) );
+        DependencyFilter resolutionFilter = new ScopeDependencyFilter( null, negate( scopesToResolve ) );
+        resolutionFilter = AndDependencyFilter.newInstance( collectionFilter, resolutionFilter );
+        resolutionFilter =
+            AndDependencyFilter.newInstance( resolutionFilter, new ReactorDependencyFilter( projectArtifacts ) );
+
+        DependencyResolutionResult result;
         try
         {
-            try
-            {
-                artifacts = projectDependenciesResolver.resolve( project , scopesToCollect,
-                                                                 scopesToResolve, session, projectArtifacts );
-            }
-            catch ( MultipleArtifactsNotFoundException e )
-            {
-                /*
-                * MNG-2277, the check below compensates for our bad plugin support where we ended up with aggregator
-                * plugins that require dependency resolution although they usually run in phases of the build where
-                * project artifacts haven't been assembled yet. The prime example of this is "mvn release:prepare".
-                */
-                artifacts = handleException( session, aggregating, e );
-            }
+            DefaultDependencyResolutionRequest request =
+                new DefaultDependencyResolutionRequest( project, session.getRepositorySession() );
+            request.setResolutionFilter( resolutionFilter );
 
-            return artifacts;
+            result = dependenciesResolver.resolve( request );
         }
-        catch ( ArtifactResolutionException e )
+        catch ( DependencyResolutionException e )
         {
-            throw new LifecycleExecutionException( null, project, e );
-        }
-        catch ( ArtifactNotFoundException e )
-        {
-            throw new LifecycleExecutionException( null, project, e );
-        }
+            result = e.getResult();
 
-    }
-
-
-    private Set<Artifact> handleException( MavenSession session, boolean aggregating,
-                                           MultipleArtifactsNotFoundException e )
-        throws MultipleArtifactsNotFoundException
-    {
-        Set<Artifact> artifacts;
             /*
              * MNG-2277, the check below compensates for our bad plugin support where we ended up with aggregator
              * plugins that require dependency resolution although they usually run in phases of the build where project
              * artifacts haven't been assembled yet. The prime example of this is "mvn release:prepare".
              */
-        if ( aggregating && areAllArtifactsInReactor( session.getProjects(), e.getMissingArtifacts() ) )
+            if ( aggregating && areAllDependenciesInReactor( session.getProjects(), result.getUnresolvedDependencies() ) )
             {
-            logger.warn( "The following artifacts could not be resolved at this point of the build"
+                logger.warn( "The following dependencies could not be resolved at this point of the build"
                     + " but seem to be part of the reactor:" );
 
-            for ( Artifact artifact : e.getMissingArtifacts() )
+                for ( Dependency dependency : result.getUnresolvedDependencies() )
                 {
-                logger.warn( "o " + artifact.getId() );
+                    logger.warn( "o " + dependency );
                 }
 
                 logger.warn( "Try running the build up to the lifecycle phase \"package\"" );
-
-            artifacts = new LinkedHashSet<Artifact>( e.getResolvedArtifacts() );
             }
             else
             {
-            throw e;
+                throw new LifecycleExecutionException( null, project, e );
+            }
+        }
+
+        Set<Artifact> artifacts = new LinkedHashSet<Artifact>();
+        if ( result.getDependencyGraph() != null && !result.getDependencyGraph().getChildren().isEmpty() )
+        {
+            RepositoryUtils.toArtifacts( artifacts, result.getDependencyGraph().getChildren(),
+                                         Collections.singletonList( project.getArtifact().getId() ), collectionFilter );
         }
         return artifacts;
     }
 
-    private boolean areAllArtifactsInReactor( Collection<MavenProject> projects, Collection<Artifact> artifacts )
+    private boolean areAllDependenciesInReactor( Collection<MavenProject> projects, Collection<Dependency> dependencies )
     {
         Set<String> projectKeys = getReactorProjectKeys( projects );
 
-        for ( Artifact artifact : artifacts )
+        for ( Dependency dependency : dependencies )
         {
-            String key = ArtifactUtils.key( artifact );
+            org.sonatype.aether.artifact.Artifact a = dependency.getArtifact();
+            String key = ArtifactUtils.key( a.getGroupId(), a.getArtifactId(), a.getVersion() );
             if ( !projectKeys.contains( key ) )
             {
                 return false;
@@ -237,4 +265,73 @@ public class LifecycleDependencyResolver
         return projectKeys;
     }
 
+    private Collection<String> negate( Collection<String> scopes )
+    {
+        Collection<String> result = new HashSet<String>();
+        Collections.addAll( result, "system", "compile", "provided", "runtime", "test" );
+
+        for ( String scope : scopes )
+        {
+            if ( "compile".equals( scope ) )
+            {
+                result.remove( "compile" );
+                result.remove( "system" );
+                result.remove( "provided" );
+            }
+            else if ( "runtime".equals( scope ) )
+            {
+                result.remove( "compile" );
+                result.remove( "runtime" );
+            }
+            else if ( "compile+runtime".equals( scope ) )
+            {
+                result.remove( "compile" );
+                result.remove( "system" );
+                result.remove( "provided" );
+                result.remove( "runtime" );
+            }
+            else if ( "runtime+system".equals( scope ) )
+            {
+                result.remove( "compile" );
+                result.remove( "system" );
+                result.remove( "runtime" );
+            }
+            else if ( "test".equals( scope ) )
+            {
+                result.clear();
+            }
+        }
+
+        return result;
+    }
+
+    private static class ReactorDependencyFilter
+        implements DependencyFilter
+    {
+
+        private Set<String> keys = new HashSet<String>();
+
+        public ReactorDependencyFilter( Collection<Artifact> artifacts )
+        {
+            for ( Artifact artifact : artifacts )
+            {
+                String key = ArtifactUtils.key( artifact );
+                keys.add( key );
+            }
+        }
+
+        public boolean accept( DependencyNode node, List<DependencyNode> parents )
+        {
+            Dependency dependency = node.getDependency();
+            if ( dependency != null )
+            {
+                org.sonatype.aether.artifact.Artifact a = dependency.getArtifact();
+                String key = ArtifactUtils.key( a.getGroupId(), a.getArtifactId(), a.getVersion() );
+                return !keys.contains( key );
+            }
+            return false;
+        }
+
+    }
+
 }

maven-core/src/main/java/org/apache/maven/lifecycle/internal/LifecyclePluginResolver.java

@@ -66,7 +66,9 @@ public class LifecyclePluginResolver
         {
             if ( plugin.getVersion() == null )
             {
-                PluginVersionRequest request = new DefaultPluginVersionRequest( plugin, session );
+                PluginVersionRequest request =
+                    new DefaultPluginVersionRequest( plugin, session.getRepositorySession(),
+                                                     project.getRemotePluginRepositories() );
                 plugin.setVersion( pluginVersionResolver.resolve( request ).getVersion() );
             }
             versions.put( plugin.getKey(), plugin.getVersion() );
@@ -82,7 +84,9 @@ public class LifecyclePluginResolver
                     plugin.setVersion( versions.get( plugin.getKey() ) );
                     if ( plugin.getVersion() == null )
                     {
-                        PluginVersionRequest request = new DefaultPluginVersionRequest( plugin, session );
+                        PluginVersionRequest request =
+                            new DefaultPluginVersionRequest( plugin, session.getRepositorySession(),
+                                                             project.getRemotePluginRepositories() );
                         plugin.setVersion( pluginVersionResolver.resolve( request ).getVersion() );
                     }
                 }

maven-core/src/main/java/org/apache/maven/lifecycle/internal/MojoDescriptorCreator.java

@@ -19,8 +19,6 @@ package org.apache.maven.lifecycle.internal;
  * under the License.
  */
 
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Dependency;
 import org.apache.maven.model.Plugin;
@@ -202,17 +200,16 @@ public class MojoDescriptorCreator
 
         injectPluginDeclarationFromProject( plugin, project );
 
-        RepositoryRequest repositoryRequest = DefaultRepositoryRequest.getRepositoryRequest( session, project );
-
         // If there is no version to be found then we need to look in the repository metadata for
         // this plugin and see what's specified as the latest release.
         //
         if ( plugin.getVersion() == null )
         {
-            resolvePluginVersion( plugin, repositoryRequest );
+            resolvePluginVersion( plugin, session, project );
         }
 
-        return pluginManager.getMojoDescriptor( plugin, goal, repositoryRequest );
+        return pluginManager.getMojoDescriptor( plugin, goal, project.getRemotePluginRepositories(),
+                                                session.getRepositorySession() );
     }
 
     // TODO: take repo mans into account as one may be aggregating prefixes of many
@@ -234,10 +231,12 @@ public class MojoDescriptorCreator
         return plugin;
     }
 
-    private void resolvePluginVersion( Plugin plugin, RepositoryRequest repositoryRequest )
+    private void resolvePluginVersion( Plugin plugin, MavenSession session, MavenProject project )
         throws PluginVersionResolutionException
     {
-        PluginVersionRequest versionRequest = new DefaultPluginVersionRequest( plugin, repositoryRequest );
+        PluginVersionRequest versionRequest =
+            new DefaultPluginVersionRequest( plugin, session.getRepositorySession(),
+                                             project.getRemotePluginRepositories() );
         plugin.setVersion( pluginVersionResolver.resolve( versionRequest ).getVersion() );
     }
 

maven-core/src/main/java/org/apache/maven/model/plugin/DefaultLifecycleBindingsInjector.java

@@ -27,7 +27,7 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.apache.maven.lifecycle.LifecycleExecutor;
+import org.apache.maven.lifecycle.LifeCyclePluginAnalyzer;
 import org.apache.maven.model.Build;
 import org.apache.maven.model.Model;
 import org.apache.maven.model.Plugin;
@@ -54,7 +54,7 @@ public class DefaultLifecycleBindingsInjector
     private LifecycleBindingsMerger merger = new LifecycleBindingsMerger();
 
     @Requirement
-    private LifecycleExecutor lifecycle;
+    private LifeCyclePluginAnalyzer lifecycle;
 
     public void injectLifecycleBindings( Model model, ModelBuildingRequest request, ModelProblemCollector problems )
     {

maven-core/src/main/java/org/apache/maven/plugin/BuildPluginManager.java

@@ -1,30 +1,29 @@
 package org.apache.maven.plugin;
 
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  * 
  * http://www.apache.org/licenses/LICENSE-2.0
  * 
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
 
-import org.apache.maven.artifact.repository.RepositoryRequest;
+import java.util.List;
+
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * @author Jason van Zyl
@@ -32,12 +31,13 @@ import org.codehaus.plexus.classworlds.realm.ClassRealm;
 public interface BuildPluginManager
 {
     // igorf: Way too many declared exceptions!
-    PluginDescriptor loadPlugin( Plugin plugin, RepositoryRequest repositoryRequest )
+    PluginDescriptor loadPlugin( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         InvalidPluginDescriptorException;
 
     // igorf: Way too many declared exceptions!
-    MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, RepositoryRequest repositoryRequest )
+    MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
+                                      RepositorySystemSession session )
         throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         MojoNotFoundException, InvalidPluginDescriptorException;
 

maven-core/src/main/java/org/apache/maven/plugin/CacheUtils.java

@@ -0,0 +1,211 @@
+package org.apache.maven.plugin;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.maven.model.Dependency;
+import org.apache.maven.model.Exclusion;
+import org.apache.maven.model.Plugin;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.RepositoryPolicy;
+import org.sonatype.aether.repository.WorkspaceReader;
+import org.sonatype.aether.repository.WorkspaceRepository;
+
+/**
+ * @author Benjamin Bentmann
+ */
+class CacheUtils
+{
+
+    public static <T> boolean eq( T s1, T s2 )
+    {
+        return s1 != null ? s1.equals( s2 ) : s2 == null;
+    }
+
+    public static int hash( Object obj )
+    {
+        return obj != null ? obj.hashCode() : 0;
+    }
+
+    public static int repositoriesHashCode( List<RemoteRepository> repositories )
+    {
+        int result = 17;
+        for ( RemoteRepository repository : repositories )
+        {
+            result = 31 * result + repositoryHashCode( repository );
+        }
+        return result;
+    }
+
+    private static int repositoryHashCode( RemoteRepository repository )
+    {
+        int result = 17;
+        result = 31 * result + hash( repository.getUrl() );
+        return result;
+    }
+
+    private static boolean repositoryEquals( RemoteRepository r1, RemoteRepository r2 )
+    {
+        if ( r1 == r2 )
+        {
+            return true;
+        }
+
+        return eq( r1.getId(), r2.getId() ) && eq( r1.getUrl(), r2.getUrl() )
+            && policyEquals( r1.getPolicy( false ), r2.getPolicy( false ) )
+            && policyEquals( r1.getPolicy( true ), r2.getPolicy( true ) );
+    }
+
+    private static boolean policyEquals( RepositoryPolicy p1, RepositoryPolicy p2 )
+    {
+        if ( p1 == p2 )
+        {
+            return true;
+        }
+        // update policy doesn't affect contents
+        return p1.isEnabled() == p2.isEnabled() && eq( p1.getChecksumPolicy(), p2.getChecksumPolicy() );
+    }
+
+    public static boolean repositoriesEquals( List<RemoteRepository> r1, List<RemoteRepository> r2 )
+    {
+        if ( r1.size() != r2.size() )
+        {
+            return false;
+        }
+
+        for ( Iterator<RemoteRepository> it1 = r1.iterator(), it2 = r2.iterator(); it1.hasNext(); )
+        {
+            if ( !repositoryEquals( it1.next(), it2.next() ) )
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public static int pluginHashCode( Plugin plugin )
+    {
+        int hash = 17;
+
+        hash = hash * 31 + hash( plugin.getGroupId() );
+        hash = hash * 31 + hash( plugin.getArtifactId() );
+        hash = hash * 31 + hash( plugin.getVersion() );
+
+        hash = hash * 31 + ( plugin.isExtensions() ? 1 : 0 );
+
+        for ( Dependency dependency : plugin.getDependencies() )
+        {
+            hash = hash * 31 + hash( dependency.getGroupId() );
+            hash = hash * 31 + hash( dependency.getArtifactId() );
+            hash = hash * 31 + hash( dependency.getVersion() );
+            hash = hash * 31 + hash( dependency.getType() );
+            hash = hash * 31 + hash( dependency.getClassifier() );
+            hash = hash * 31 + hash( dependency.getScope() );
+
+            for ( Exclusion exclusion : dependency.getExclusions() )
+            {
+                hash = hash * 31 + hash( exclusion.getGroupId() );
+                hash = hash * 31 + hash( exclusion.getArtifactId() );
+            }
+        }
+
+        return hash;
+    }
+
+    public static boolean pluginEquals( Plugin a, Plugin b )
+    {
+        return eq( a.getArtifactId(), b.getArtifactId() ) //
+            && eq( a.getGroupId(), b.getGroupId() ) //
+            && eq( a.getVersion(), b.getVersion() ) // 
+            && a.isExtensions() == b.isExtensions() //
+            && dependenciesEquals( a.getDependencies(), b.getDependencies() );
+    }
+
+    private static boolean dependenciesEquals( List<Dependency> a, List<Dependency> b )
+    {
+        if ( a.size() != b.size() )
+        {
+            return false;
+        }
+
+        Iterator<Dependency> aI = a.iterator();
+        Iterator<Dependency> bI = b.iterator();
+
+        while ( aI.hasNext() )
+        {
+            Dependency aD = aI.next();
+            Dependency bD = bI.next();
+
+            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
+                && eq( aD.getArtifactId(), bD.getArtifactId() ) //
+                && eq( aD.getVersion(), bD.getVersion() ) // 
+                && eq( aD.getType(), bD.getType() ) //
+                && eq( aD.getClassifier(), bD.getClassifier() ) //
+                && eq( aD.getScope(), bD.getScope() );
+
+            r &= exclusionsEquals( aD.getExclusions(), bD.getExclusions() );
+
+            if ( !r )
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    private static boolean exclusionsEquals( List<Exclusion> a, List<Exclusion> b )
+    {
+        if ( a.size() != b.size() )
+        {
+            return false;
+        }
+
+        Iterator<Exclusion> aI = a.iterator();
+        Iterator<Exclusion> bI = b.iterator();
+
+        while ( aI.hasNext() )
+        {
+            Exclusion aD = aI.next();
+            Exclusion bD = bI.next();
+
+            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
+                && eq( aD.getArtifactId(), bD.getArtifactId() );
+
+            if ( !r )
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public static WorkspaceRepository getWorkspace( RepositorySystemSession session )
+    {
+        WorkspaceReader reader = session.getWorkspaceReader();
+        return ( reader != null ) ? reader.getRepository() : null;
+    }
+
+}

maven-core/src/main/java/org/apache/maven/plugin/DefaultBuildPluginManager.java

@@ -1,28 +1,24 @@
 package org.apache.maven.plugin;
 
 /*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at
  * 
  * http://www.apache.org/licenses/LICENSE-2.0
  * 
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
+import java.util.List;
 
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
@@ -32,6 +28,8 @@ import org.codehaus.plexus.PlexusContainer;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 // TODO: the antrun plugin has its own configurator, the only plugin that does. might need to think about how that works
 // TODO: remove the coreArtifactFilterManager
@@ -59,11 +57,10 @@ public class DefaultBuildPluginManager
      * @throws PluginResolutionException The plugin could be found but could not be resolved.
      * @throws InvalidPluginDescriptorException 
      */
-    public PluginDescriptor loadPlugin( Plugin plugin, RepositoryRequest repositoryRequest )
-        throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
-        InvalidPluginDescriptorException
+    public PluginDescriptor loadPlugin( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
+        throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException, InvalidPluginDescriptorException
     {
-        return mavenPluginManager.getPluginDescriptor( plugin, repositoryRequest );
+        return mavenPluginManager.getPluginDescriptor( plugin, repositories, session );
     }
 
     // ----------------------------------------------------------------------
@@ -192,11 +189,12 @@ public class DefaultBuildPluginManager
         return pluginDescriptor.getClassRealm();
     }
 
-    public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, RepositoryRequest repositoryRequest )
+    public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
+                                             RepositorySystemSession session )
         throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         MojoNotFoundException, InvalidPluginDescriptorException
     {
-        return mavenPluginManager.getMojoDescriptor( plugin, goal, repositoryRequest );
+        return mavenPluginManager.getMojoDescriptor( plugin, goal, repositories, session );
     }
 
 }

maven-core/src/main/java/org/apache/maven/plugin/DefaultExtensionRealmCache.java

@@ -25,11 +25,11 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.apache.maven.artifact.Artifact;
 import org.apache.maven.project.ExtensionDescriptor;
 import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.artifact.Artifact;
 
 /**
  * Default extension realm cache implementation. Assumes cached data does not change.

maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginArtifactsCache.java

@@ -22,19 +22,18 @@ package org.apache.maven.plugin;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
-import org.apache.maven.model.Dependency;
-import org.apache.maven.model.Exclusion;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.WorkspaceRepository;
 
 /**
  * @author Igor Fedorenko
@@ -46,36 +45,67 @@ public class DefaultPluginArtifactsCache
 {
 
     private static class CacheKey
+        implements Key
     {
 
         private final Plugin plugin;
 
-        private final List<ArtifactRepository> repositories = new ArrayList<ArtifactRepository>();
+        private final WorkspaceRepository workspace;
 
-        private final ArtifactFilter extensionArtifactFilter;
+        private final LocalRepository localRepo;
+
+        private final List<RemoteRepository> repositories;
+
+        private final DependencyFilter filter;
 
         private final int hashCode;
 
-        public CacheKey( Plugin plugin, RepositoryRequest repositoryRequest, ArtifactFilter extensionArtifactFilter )
+        public CacheKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
+                         RepositorySystemSession session )
         {
             this.plugin = plugin.clone();
-            this.repositories.add( repositoryRequest.getLocalRepository() );
-            this.repositories.addAll( repositoryRequest.getRemoteRepositories() );
-            this.extensionArtifactFilter = extensionArtifactFilter;
+            workspace = CacheUtils.getWorkspace( session );
+            this.localRepo = session.getLocalRepository();
+            this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
+            for ( RemoteRepository repository : repositories )
+            {
+                if ( repository.isRepositoryManager() )
+                {
+                    this.repositories.addAll( repository.getMirroredRepositories() );
+                }
+                else
+                {
+                    this.repositories.add( repository );
+                }
+            }
+            this.filter = extensionFilter;
 
             int hash = 17;
-            hash = hash * 31 + pluginHashCode( plugin );
-            hash = hash * 31 + repositories.hashCode();
-            hash = hash * 31 + ( extensionArtifactFilter != null ? extensionArtifactFilter.hashCode() : 0 );
+            hash = hash * 31 + CacheUtils.pluginHashCode( plugin );
+            hash = hash * 31 + hash( workspace );
+            hash = hash * 31 + hash( localRepo );
+            hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
+            hash = hash * 31 + hash( extensionFilter );
             this.hashCode = hash;
         }
 
+        @Override
+        public String toString()
+        {
+            return plugin.getId();
+        }
+
         @Override
         public int hashCode()
         {
             return hashCode;
         }
 
+        private static int hash( Object obj )
+        {
+            return obj != null ? obj.hashCode() : 0;
+        }
+
         @Override
         public boolean equals( Object o )
         {
@@ -89,34 +119,43 @@ public class DefaultPluginArtifactsCache
                 return false;
             }
 
-            CacheKey other = (CacheKey) o;
+            CacheKey that = (CacheKey) o;
 
-            return pluginEquals( plugin, other.plugin ) && eq( repositories, other.repositories )
-                && eq( extensionArtifactFilter, other.extensionArtifactFilter );
+            return CacheUtils.pluginEquals( plugin, that.plugin ) && eq( workspace, that.workspace )
+                && eq( localRepo, that.localRepo ) && CacheUtils.repositoriesEquals( repositories, that.repositories )
+                && eq( filter, that.filter );
         }
 
-    }
-
-    protected final Map<CacheKey, CacheRecord> cache = new HashMap<CacheKey, CacheRecord>();
-
-    public CacheRecord get( Plugin plugin, RepositoryRequest repositoryRequest, ArtifactFilter extensionArtifactFilter )
+        private static <T> boolean eq( T s1, T s2 )
         {
-        return cache.get( new CacheKey( plugin, repositoryRequest, extensionArtifactFilter ) );
+            return s1 != null ? s1.equals( s2 ) : s2 == null;
         }
 
-    public CacheRecord put( Plugin plugin, RepositoryRequest repositoryRequest, ArtifactFilter extensionArtifactFilter,
-                            List<Artifact> pluginArtifacts )
+    }
+
+    protected final Map<Key, CacheRecord> cache = new HashMap<Key, CacheRecord>();
+
+    public Key createKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
+                          RepositorySystemSession session )
+    {
+        return new CacheKey( plugin, extensionFilter, repositories, session );
+    }
+
+    public CacheRecord get( Key key )
+    {
+        return cache.get( key );
+    }
+
+    public CacheRecord put( Key key, List<Artifact> pluginArtifacts )
     {
         if ( pluginArtifacts == null )
         {
             throw new NullPointerException();
         }
 
-        CacheKey key = new CacheKey( plugin, repositoryRequest, extensionArtifactFilter );
-
         if ( cache.containsKey( key ) )
         {
-            throw new IllegalStateException( "Duplicate artifact resolution result for plugin " + plugin.getId() );
+            throw new IllegalStateException( "Duplicate artifact resolution result for plugin " + key );
         }
 
         CacheRecord record =
@@ -134,102 +173,12 @@ public class DefaultPluginArtifactsCache
 
     protected static int pluginHashCode( Plugin plugin )
     {
-        int hash = 17;
-
-        hash = hash * 31 + plugin.getGroupId().hashCode();
-        hash = hash * 31 + plugin.getArtifactId().hashCode();
-        hash = hash * 31 + plugin.getVersion().hashCode();
-
-        for ( Dependency dependency : plugin.getDependencies() )
-        {
-            hash = hash * 31 + dependency.getGroupId().hashCode();
-            hash = hash * 31 + dependency.getArtifactId().hashCode();
-            hash = hash * 31 + dependency.getVersion().hashCode();
-            hash = hash * 31 + dependency.getType().hashCode();
-            hash = hash * 31 + ( dependency.getClassifier() != null ? dependency.getClassifier().hashCode() : 0 );
-            hash = hash * 31 + ( dependency.getScope() != null ? dependency.getScope().hashCode() : 0 );
-
-            for ( Exclusion exclusion : dependency.getExclusions() )
-            {
-                hash = hash * 31 + exclusion.getGroupId().hashCode();
-                hash = hash * 31 + exclusion.getArtifactId().hashCode();
-            }
-        }
-
-        return hash;
+        return CacheUtils.pluginHashCode( plugin );
     }
 
     protected static boolean pluginEquals( Plugin a, Plugin b )
     {
-        return eq( a.getGroupId(), b.getGroupId() ) //
-            && eq( a.getArtifactId(), b.getArtifactId() ) //
-            && eq( a.getVersion(), b.getVersion() ) // 
-            && dependenciesEquals( a.getDependencies(), b.getDependencies() );
-    }
-
-    private static boolean dependenciesEquals( List<Dependency> a, List<Dependency> b )
-    {
-        if ( a.size() != b.size() )
-        {
-            return false;
-        }
-
-        Iterator<Dependency> aI = a.iterator();
-        Iterator<Dependency> bI = b.iterator();
-
-        while ( aI.hasNext() )
-        {
-            Dependency aD = aI.next();
-            Dependency bD = bI.next();
-
-            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
-                && eq( aD.getArtifactId(), bD.getArtifactId() ) //
-                && eq( aD.getVersion(), bD.getVersion() ) // 
-                && eq( aD.getType(), bD.getType() ) //
-                && eq( aD.getClassifier(), bD.getClassifier() ) //
-                && eq( aD.getScope(), bD.getScope() );
-
-            r &= exclusionsEquals( aD.getExclusions(), bD.getExclusions() );
-
-            if ( !r )
-            {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    private static boolean exclusionsEquals( List<Exclusion> a, List<Exclusion> b )
-    {
-        if ( a.size() != b.size() )
-        {
-            return false;
-        }
-
-        Iterator<Exclusion> aI = a.iterator();
-        Iterator<Exclusion> bI = b.iterator();
-
-        while ( aI.hasNext() )
-        {
-            Exclusion aD = aI.next();
-            Exclusion bD = bI.next();
-
-            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
-                && eq( aD.getArtifactId(), bD.getArtifactId() );
-
-            if ( !r )
-            {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    private static <T> boolean eq( T s1, T s2 )
-    {
-        return s1 != null ? s1.equals( s2 ) : s2 == null;
+        return CacheUtils.pluginEquals( a, b );
     }
 
     public void register( MavenProject project, CacheRecord record )

maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginDescriptorCache.java

@@ -21,19 +21,19 @@ package org.apache.maven.plugin;
 
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
 import org.apache.maven.artifact.ArtifactUtils;
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.repository.ComponentDescriptor;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.WorkspaceRepository;
 
 /**
  * Caches raw plugin descriptors. A raw plugin descriptor is a descriptor that has just been extracted from the plugin
@@ -57,14 +57,9 @@ public class DefaultPluginDescriptorCache
         descriptors.clear();
     }
 
-    public Key createKey( Plugin plugin, RepositoryRequest repositoryRequest )
+    public Key createKey( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
     {
-        return new CacheKey( plugin, repositoryRequest );
-    }
-
-    public void put( Key cacheKey, PluginDescriptor pluginDescriptor )
-    {
-        descriptors.put( cacheKey, clone( pluginDescriptor ) );
+        return new CacheKey( plugin, repositories, session );
     }
 
     public PluginDescriptor get( Key cacheKey )
@@ -72,6 +67,11 @@ public class DefaultPluginDescriptorCache
         return clone( descriptors.get( cacheKey ) );
     }
 
+    public void put( Key cacheKey, PluginDescriptor pluginDescriptor )
+    {
+        descriptors.put( cacheKey, clone( pluginDescriptor ) );
+    }
+
     private static PluginDescriptor clone( PluginDescriptor original )
     {
         PluginDescriptor clone = null;
@@ -129,25 +129,42 @@ public class DefaultPluginDescriptorCache
 
         private final String version;
 
-        private final List<ArtifactRepository> repositories;
+        private final WorkspaceRepository workspace;
+
+        private final LocalRepository localRepo;
+
+        private final List<RemoteRepository> repositories;
 
         private final int hashCode;
 
-        public CacheKey( Plugin plugin, RepositoryRequest repositoryRequest )
+        public CacheKey( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         {
             groupId = plugin.getGroupId();
             artifactId = plugin.getArtifactId();
             version = plugin.getVersion();
 
-            repositories = new ArrayList<ArtifactRepository>( repositoryRequest.getRemoteRepositories().size() + 1 );
-            repositories.add( repositoryRequest.getLocalRepository() );
-            repositories.addAll( repositoryRequest.getRemoteRepositories() );
+            workspace = CacheUtils.getWorkspace( session );
+            localRepo = session.getLocalRepository();
+            this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
+            for ( RemoteRepository repository : repositories )
+            {
+                if ( repository.isRepositoryManager() )
+                {
+                    this.repositories.addAll( repository.getMirroredRepositories() );
+                }
+                else
+                {
+                    this.repositories.add( repository );
+                }
+            }
 
             int hash = 17;
             hash = hash * 31 + groupId.hashCode();
             hash = hash * 31 + artifactId.hashCode();
             hash = hash * 31 + version.hashCode();
-            hash = hash * 31 + repositoriesHashCode( repositories );
+            hash = hash * 31 + hash( workspace );
+            hash = hash * 31 + localRepo.hashCode();
+            hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
             this.hashCode = hash;
         }
 
@@ -172,8 +189,10 @@ public class DefaultPluginDescriptorCache
 
             CacheKey that = (CacheKey) obj;
 
-            return this.artifactId.equals( that.artifactId ) && this.groupId.equals( that.groupId )
-                && this.version.equals( that.version ) && repositoriesEquals( this.repositories, that.repositories );
+            return eq( this.artifactId, that.artifactId ) && eq( this.groupId, that.groupId )
+                && eq( this.version, that.version ) && eq( this.localRepo, that.localRepo )
+                && eq( this.workspace, that.workspace )
+                && CacheUtils.repositoriesEquals( this.repositories, that.repositories );
         }
 
         @Override
@@ -182,61 +201,9 @@ public class DefaultPluginDescriptorCache
             return groupId + ':' + artifactId + ':' + version;
         }
 
-        private static int repositoryHashCode( ArtifactRepository repository )
+        private static int hash( Object obj )
         {
-            int result = 17;
-            result = 31 * result + ( repository.getId() != null ? repository.getId().hashCode() : 0 );
-            return result;
-        }
-
-        private static int repositoriesHashCode( List<ArtifactRepository> repositories )
-        {
-            int result = 17;
-            for ( ArtifactRepository repository : repositories )
-            {
-                result = 31 * result + repositoryHashCode( repository );
-            }
-            return result;
-        }
-
-        private static boolean repositoryEquals( ArtifactRepository r1, ArtifactRepository r2 )
-        {
-            if ( r1 == r2 )
-            {
-                return true;
-            }
-
-            return eq( r1.getId(), r2.getId() ) && eq( r1.getUrl(), r2.getUrl() )
-                && repositoryPolicyEquals( r1.getReleases(), r2.getReleases() )
-                && repositoryPolicyEquals( r1.getSnapshots(), r2.getSnapshots() );
-        }
-
-        private static boolean repositoryPolicyEquals( ArtifactRepositoryPolicy p1, ArtifactRepositoryPolicy p2 )
-        {
-            if ( p1 == p2 )
-            {
-                return true;
-            }
-
-            return p1.isEnabled() == p2.isEnabled() && eq( p1.getUpdatePolicy(), p2.getUpdatePolicy() );
-        }
-
-        private static boolean repositoriesEquals( List<ArtifactRepository> r1, List<ArtifactRepository> r2 )
-        {
-            if ( r1.size() != r2.size() )
-            {
-                return false;
-            }
-
-            for ( Iterator<ArtifactRepository> it1 = r1.iterator(), it2 = r2.iterator(); it1.hasNext(); )
-            {
-                if ( !repositoryEquals( it1.next(), it2.next() ) )
-                {
-                    return false;
-                }
-            }
-
-            return true;
+            return obj != null ? obj.hashCode() : 0;
         }
 
         private static <T> boolean eq( T s1, T s2 )

maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginRealmCache.java

@@ -21,20 +21,20 @@ package org.apache.maven.plugin;
 
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
-import org.apache.maven.model.Dependency;
-import org.apache.maven.model.Exclusion;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
 import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.WorkspaceRepository;
 
 /**
  * Default PluginCache implementation. Assumes cached data does not change.
@@ -45,45 +45,76 @@ public class DefaultPluginRealmCache
 {
 
     protected static class CacheKey
+        implements Key
     {
+
         private final Plugin plugin;
 
-        private final List<ArtifactRepository> repositories = new ArrayList<ArtifactRepository>();
+        private final WorkspaceRepository workspace;
+
+        private final LocalRepository localRepo;
+
+        private final List<RemoteRepository> repositories;
 
         private final ClassLoader parentRealm;
 
         private final List<String> parentImports;
 
-        private final ArtifactFilter filter;
+        private final DependencyFilter filter;
 
         private final int hashCode;
 
         public CacheKey( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
-                         ArtifactFilter dependencyFilter, ArtifactRepository localRepository,
-                         List<ArtifactRepository> remoteRepositories )
+                         DependencyFilter dependencyFilter, List<RemoteRepository> repositories,
+                         RepositorySystemSession session )
         {
             this.plugin = plugin.clone();
-            this.repositories.add( localRepository );
-            this.repositories.addAll( remoteRepositories );
+            this.workspace = CacheUtils.getWorkspace( session );
+            this.localRepo = session.getLocalRepository();
+            this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
+            for ( RemoteRepository repository : repositories )
+            {
+                if ( repository.isRepositoryManager() )
+                {
+                    this.repositories.addAll( repository.getMirroredRepositories() );
+                }
+                else
+                {
+                    this.repositories.add( repository );
+                }
+            }
             this.parentRealm = parentRealm;
             this.parentImports = ( parentImports != null ) ? parentImports : Collections.<String> emptyList();
             this.filter = dependencyFilter;
 
             int hash = 17;
-            hash = hash * 31 + pluginHashCode( plugin );
-            hash = hash * 31 + repositories.hashCode();
-            hash = hash * 31 + ( parentRealm != null ? parentRealm.hashCode() : 0 );
+            hash = hash * 31 + CacheUtils.pluginHashCode( plugin );
+            hash = hash * 31 + hash( workspace );
+            hash = hash * 31 + hash( localRepo );
+            hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
+            hash = hash * 31 + hash( parentRealm );
             hash = hash * 31 + this.parentImports.hashCode();
-            hash = hash * 31 + ( dependencyFilter != null ? dependencyFilter.hashCode() : 0 );
+            hash = hash * 31 + hash( dependencyFilter );
             this.hashCode = hash;
         }
 
+        @Override
+        public String toString()
+        {
+            return plugin.getId();
+        }
+
         @Override
         public int hashCode()
         {
             return hashCode;
         }
 
+        private static int hash( Object obj )
+        {
+            return obj != null ? obj.hashCode() : 0;
+        }
+
         @Override
         public boolean equals( Object o )
         {
@@ -97,40 +128,45 @@ public class DefaultPluginRealmCache
                 return false;
             }
 
-            CacheKey other = (CacheKey) o;
+            CacheKey that = (CacheKey) o;
 
-            return parentRealm == other.parentRealm && pluginEquals( plugin, other.plugin )
-                && eq( repositories, other.repositories ) && eq( filter, other.filter )
-                && eq( parentImports, other.parentImports );
-        }
+            return parentRealm == that.parentRealm && CacheUtils.pluginEquals( plugin, that.plugin )
+                && eq( workspace, that.workspace ) && eq( localRepo, that.localRepo )
+                && CacheUtils.repositoriesEquals( this.repositories, that.repositories ) && eq( filter, that.filter )
+                && eq( parentImports, that.parentImports );
         }
 
-    protected final Map<CacheKey, CacheRecord> cache = new ConcurrentHashMap<CacheKey, CacheRecord>();
-
-    public CacheRecord get( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
-                            ArtifactFilter dependencyFilter, ArtifactRepository localRepository,
-                            List<ArtifactRepository> remoteRepositories )
+        private static <T> boolean eq( T s1, T s2 )
         {
-        return cache.get( new CacheKey( plugin, parentRealm, parentImports, dependencyFilter, localRepository,
-                                        remoteRepositories ) );
+            return s1 != null ? s1.equals( s2 ) : s2 == null;
         }
 
-    public CacheRecord put( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
-                            ArtifactFilter dependencyFilter, ArtifactRepository localRepository,
-                            List<ArtifactRepository> remoteRepositories, ClassRealm pluginRealm,
-                            List<Artifact> pluginArtifacts )
+    }
+
+    protected final Map<Key, CacheRecord> cache = new ConcurrentHashMap<Key, CacheRecord>();
+
+    public Key createKey( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
+                          DependencyFilter dependencyFilter, List<RemoteRepository> repositories,
+                          RepositorySystemSession session )
+    {
+        return new CacheKey( plugin, parentRealm, parentImports, dependencyFilter, repositories, session );
+    }
+
+    public CacheRecord get( Key key )
+    {
+        return cache.get( key );
+    }
+
+    public CacheRecord put( Key key, ClassRealm pluginRealm, List<Artifact> pluginArtifacts )
     {
         if ( pluginRealm == null || pluginArtifacts == null )
         {
-            throw new NullPointerException();
+            throw new IllegalArgumentException();
         }
 
-        CacheKey key =
-            new CacheKey( plugin, parentRealm, parentImports, dependencyFilter, localRepository, remoteRepositories );
-
         if ( cache.containsKey( key ) )
         {
-            throw new IllegalStateException( "Duplicate plugin realm for plugin " + plugin.getId() );
+            throw new IllegalStateException( "Duplicate plugin realm for plugin " + key );
         }
 
         CacheRecord record = new CacheRecord( pluginRealm, pluginArtifacts );
@@ -147,105 +183,12 @@ public class DefaultPluginRealmCache
 
     protected static int pluginHashCode( Plugin plugin )
     {
-        int hash = 17;
-
-        hash = hash * 31 + plugin.getGroupId().hashCode();
-        hash = hash * 31 + plugin.getArtifactId().hashCode();
-        hash = hash * 31 + plugin.getVersion().hashCode();
-
-        hash = hash * 31 + ( plugin.isExtensions() ? 1 : 0 );
-
-        for ( Dependency dependency : plugin.getDependencies() )
-        {
-            hash = hash * 31 + dependency.getGroupId().hashCode();
-            hash = hash * 31 + dependency.getArtifactId().hashCode();
-            hash = hash * 31 + dependency.getVersion().hashCode();
-            hash = hash * 31 + dependency.getType().hashCode();
-            hash = hash * 31 + ( dependency.getClassifier() != null ? dependency.getClassifier().hashCode() : 0 );
-            hash = hash * 31 + ( dependency.getScope() != null ? dependency.getScope().hashCode() : 0 );
-
-            for ( Exclusion exclusion : dependency.getExclusions() )
-            {
-                hash = hash * 31 + exclusion.getGroupId().hashCode();
-                hash = hash * 31 + exclusion.getArtifactId().hashCode();
-            }
-        }
-
-        return hash;
+        return CacheUtils.pluginHashCode( plugin );
     }
 
     protected static boolean pluginEquals( Plugin a, Plugin b )
     {
-        return eq( a.getGroupId(), b.getGroupId() ) //
-            && eq( a.getArtifactId(), b.getArtifactId() ) //
-            && eq( a.getVersion(), b.getVersion() ) //
-            && a.isExtensions() == b.isExtensions() //
-            && dependenciesEquals( a.getDependencies(), b.getDependencies() );
-    }
-
-    private static boolean dependenciesEquals( List<Dependency> a, List<Dependency> b )
-    {
-        if ( a.size() != b.size() )
-        {
-            return false;
-        }
-
-        Iterator<Dependency> aI = a.iterator();
-        Iterator<Dependency> bI = b.iterator();
-
-        while ( aI.hasNext() )
-        {
-            Dependency aD = aI.next();
-            Dependency bD = bI.next();
-
-            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
-                && eq( aD.getArtifactId(), bD.getArtifactId() ) //
-                && eq( aD.getVersion(), bD.getVersion() ) //
-                && eq( aD.getType(), bD.getType() ) //
-                && eq( aD.getClassifier(), bD.getClassifier() ) //
-                && eq( aD.getScope(), bD.getScope() );
-
-            r &= exclusionsEquals( aD.getExclusions(), bD.getExclusions() );
-
-            if ( !r )
-            {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    private static boolean exclusionsEquals( List<Exclusion> a, List<Exclusion> b )
-    {
-        if ( a.size() != b.size() )
-        {
-            return false;
-        }
-
-        Iterator<Exclusion> aI = a.iterator();
-        Iterator<Exclusion> bI = b.iterator();
-
-        while ( aI.hasNext() )
-        {
-            Exclusion aD = aI.next();
-            Exclusion bD = bI.next();
-
-            boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
-                && eq( aD.getArtifactId(), bD.getArtifactId() );
-
-            if ( !r )
-            {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    private static <T> boolean eq( T s1, T s2 )
-    {
-        return s1 != null ? s1.equals( s2 ) : s2 == null;
+        return CacheUtils.pluginEquals( a, b );
     }
 
     public void register( MavenProject project, CacheRecord record )

maven-core/src/main/java/org/apache/maven/plugin/ExtensionRealmCache.java

@@ -21,10 +21,10 @@ package org.apache.maven.plugin;
 
 import java.util.List;
 
-import org.apache.maven.artifact.Artifact;
 import org.apache.maven.project.ExtensionDescriptor;
 import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.sonatype.aether.artifact.Artifact;
 
 /**
  * Caches extension class realms. <strong>Warning:</strong> This is an internal utility interface that is only public

maven-core/src/main/java/org/apache/maven/plugin/InvalidPluginDescriptorException.java

@@ -24,12 +24,10 @@ import java.util.List;
 public class InvalidPluginDescriptorException
     extends Exception
 {
-    private List<String> errors;
     
     public InvalidPluginDescriptorException( String message, List<String> errors )
     {
         super( toMessage( message, errors ) );
-        this.errors = errors;
     }
 
     private static String toMessage( String message, List<String> errors )

maven-core/src/main/java/org/apache/maven/plugin/LegacySupport.java

@@ -20,6 +20,7 @@ package org.apache.maven.plugin;
  */
 
 import org.apache.maven.execution.MavenSession;
+import org.sonatype.aether.RepositorySystemSession;
 
 /**
  * Helps to provide backward-compatibility with plugins that use legacy components. <strong>Warning:</strong> This is an
@@ -48,4 +49,11 @@ public interface LegacySupport
      */
     MavenSession getSession();
 
+    /**
+     * Gets the currently active repository session.
+     * 
+     * @return The currently active repository session or {@code null} if none.
+     */
+    RepositorySystemSession getRepositorySession();
+
 }

maven-core/src/main/java/org/apache/maven/plugin/MavenPluginManager.java

@@ -21,12 +21,13 @@ package org.apache.maven.plugin;
 
 import java.util.List;
 
-import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Provides basic services to manage Maven plugins and their mojos. This component is kept general in its design such
@@ -43,11 +44,12 @@ public interface MavenPluginManager
      * Retrieves the descriptor for the specified plugin from its main artifact.
      * 
      * @param plugin The plugin whose descriptor should be retrieved, must not be {@code null}.
-     * @param repositoryRequest The repository request to use for resolving the plugin's main artifact, must not be
-     *            {@code null}.
+     * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
+     *            null}.
+     * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
      * @return The plugin descriptor, never {@code null}.
      */
-    PluginDescriptor getPluginDescriptor( Plugin plugin, RepositoryRequest repositoryRequest )
+    PluginDescriptor getPluginDescriptor( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException, PluginDescriptorParsingException, InvalidPluginDescriptorException;
 
     /**
@@ -55,11 +57,13 @@ public interface MavenPluginManager
      * 
      * @param plugin The plugin whose mojo descriptor should be retrieved, must not be {@code null}.
      * @param goal The simple name of the mojo whose descriptor should be retrieved, must not be {@code null}.
-     * @param repositoryRequest The repository request to use for resolving the plugin's main artifact, must not be
-     *            {@code null}.
+     * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
+     *            null}.
+     * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
      * @return The mojo descriptor, never {@code null}.
      */
-    MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, RepositoryRequest repositoryRequest )
+    MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
+                                      RepositorySystemSession session )
         throws MojoNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         InvalidPluginDescriptorException;
 
@@ -76,7 +80,7 @@ public interface MavenPluginManager
      * @param filter The filter used to exclude certain plugin dependencies, may be {@code null}.
      */
     void setupPluginRealm( PluginDescriptor pluginDescriptor, MavenSession session, ClassLoader parent,
-                           List<String> imports, ArtifactFilter filter )
+                           List<String> imports, DependencyFilter filter )
         throws PluginResolutionException, PluginContainerException;
 
     /**

maven-core/src/main/java/org/apache/maven/plugin/PluginArtifactsCache.java

@@ -21,11 +21,12 @@ package org.apache.maven.plugin;
 
 import java.util.List;
 
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.project.MavenProject;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Caches plugin artifacts. <strong>Warning:</strong> This is an internal utility interface that is only public for
@@ -38,6 +39,14 @@ import org.apache.maven.project.MavenProject;
 public interface PluginArtifactsCache
 {
 
+    /**
+     * A cache key.
+     */
+    interface Key
+    {
+        // marker interface for cache keys
+    }
+
     public static class CacheRecord
     {
 
@@ -50,10 +59,12 @@ public interface PluginArtifactsCache
 
     }
 
-    CacheRecord get( Plugin plugin, RepositoryRequest repositoryRequest, ArtifactFilter extensionArtifactFilter );
+    Key createKey( Plugin plugin, DependencyFilter extensionFilter, List<RemoteRepository> repositories,
+                   RepositorySystemSession session );
 
-    CacheRecord put( Plugin plugin, RepositoryRequest repositoryRequest, ArtifactFilter extensionArtifactFilter,
-                     List<Artifact> pluginArtifacts );
+    CacheRecord get( Key key );
+
+    CacheRecord put( Key key, List<Artifact> pluginArtifacts );
 
     void flush();
 

maven-core/src/main/java/org/apache/maven/plugin/PluginDescriptorCache.java

@@ -19,9 +19,12 @@ package org.apache.maven.plugin;
  * under the License.
  */
 
-import org.apache.maven.artifact.repository.RepositoryRequest;
+import java.util.List;
+
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Caches raw plugin descriptors. A raw plugin descriptor is a descriptor that has just been extracted from the plugin
@@ -44,11 +47,11 @@ public interface PluginDescriptorCache
         // marker interface for cache keys
     }
 
-    Key createKey( Plugin plugin, RepositoryRequest repositoryRequest );
+    Key createKey( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session );
 
-    void put( Key cacheKey, PluginDescriptor pluginDescriptor );
+    void put( Key key, PluginDescriptor pluginDescriptor );
 
-    PluginDescriptor get( Key cacheKey );
+    PluginDescriptor get( Key key );
 
     void flush();
 

maven-core/src/main/java/org/apache/maven/plugin/PluginDescriptorParsingException.java

@@ -28,12 +28,9 @@ public class PluginDescriptorParsingException
     extends Exception
 {
 
-    private Plugin plugin;
-
     public PluginDescriptorParsingException( Plugin plugin, String descriptorLocation, Throwable e )
     {
         super( createMessage( plugin, descriptorLocation, e ), e );
-        this.plugin = plugin;
     }
 
     private static String createMessage( Plugin plugin, String descriptorLocation, Throwable e )

maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java

@@ -229,6 +229,10 @@ public class PluginParameterExpressionEvaluator
                                                          e );
             }
         }
+        else if ( expression.equals( "repositorySystemSession" ) )
+        {
+            value = session.getRepositorySession();
+        }
         else if ( expression.equals( "mojo" ) )
         {
             value = mojoExecution;

maven-core/src/main/java/org/apache/maven/plugin/PluginRealmCache.java

@@ -22,11 +22,12 @@ package org.apache.maven.plugin;
 import java.util.List;
 
 import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.project.MavenProject;
 import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Caches plugin class realms. <strong>Warning:</strong> This is an internal utility interface that is only public for
@@ -42,6 +43,7 @@ public interface PluginRealmCache
     public static class CacheRecord
     {
         public final ClassRealm realm;
+
         public final List<Artifact> artifacts;
 
         public CacheRecord( ClassRealm realm, List<Artifact> artifacts )
@@ -51,14 +53,20 @@ public interface PluginRealmCache
         }
     }
 
-    CacheRecord get( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
-                     ArtifactFilter dependencyFilter, ArtifactRepository localRepository,
-                     List<ArtifactRepository> remoteRepositories );
+    /**
+     * A cache key.
+     */
+    interface Key
+    {
+        // marker interface for cache keys
+    }
 
-    CacheRecord put( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
-                     ArtifactFilter dependencyFilter, ArtifactRepository localRepository,
-                     List<ArtifactRepository> remoteRepositories, ClassRealm pluginRealm,
-                     List<Artifact> pluginArtifacts );
+    Key createKey( Plugin plugin, ClassLoader parentRealm, List<String> parentImports,
+                   DependencyFilter dependencyFilter, List<RemoteRepository> repositories, RepositorySystemSession session );
+
+    CacheRecord get( Key key );
+
+    CacheRecord put( Key key, ClassRealm pluginRealm, List<Artifact> pluginArtifacts );
 
     void flush();
 

maven-core/src/main/java/org/apache/maven/plugin/PluginResolutionException.java

@@ -19,8 +19,6 @@ package org.apache.maven.plugin;
  * under the License.
  */
 
-import org.apache.maven.artifact.resolver.AbstractArtifactResolutionException;
-import org.apache.maven.artifact.resolver.ArtifactResolutionException;
 import org.apache.maven.model.Plugin;
 
 /**
@@ -30,15 +28,15 @@ import org.apache.maven.model.Plugin;
  * @version $Id$
  */
 public class PluginResolutionException
-    extends AbstractArtifactResolutionException
+    extends Exception
 {
+
     private final Plugin plugin;
 
-    public PluginResolutionException( Plugin plugin, ArtifactResolutionException e )
+    public PluginResolutionException( Plugin plugin, Throwable cause )
     {
-        super( "Plugin " + plugin.getId() + " or one of its dependencies could not be resolved: " + e.getMessage(),
-               e.getGroupId(), e.getArtifactId(), e.getVersion(), e.getType(), null, e.getRemoteRepositories(), null,
-               e );
+        super( "Plugin " + plugin.getId() + " or one of its dependencies could not be resolved: " + cause.getMessage(),
+               cause );
         this.plugin = plugin;
     }
 
@@ -46,4 +44,5 @@ public class PluginResolutionException
     {
         return plugin;
     }
+
 }

maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultLegacySupport.java

@@ -22,6 +22,7 @@ package org.apache.maven.plugin.internal;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.plugin.LegacySupport;
 import org.codehaus.plexus.component.annotations.Component;
+import org.sonatype.aether.RepositorySystemSession;
 
 /**
  * Helps to provide backward-compatibility with plugins that use legacy components. <strong>Warning:</strong> This is an
@@ -55,4 +56,10 @@ public class DefaultLegacySupport
         return session.get();
     }
 
+    public RepositorySystemSession getRepositorySession()
+    {
+        MavenSession session = getSession();
+        return ( session != null ) ? session.getRepositorySession() : null;
+    }
+
 }

maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultMavenPluginManager.java

@@ -28,18 +28,16 @@ import java.io.InputStream;
 import java.io.PrintStream;
 import java.io.Reader;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.jar.JarFile;
 import java.util.zip.ZipEntry;
 
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
-import org.apache.maven.artifact.resolver.filter.AndArtifactFilter;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.classrealm.ClassRealmManager;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Plugin;
@@ -86,6 +84,12 @@ import org.codehaus.plexus.util.IOUtil;
 import org.codehaus.plexus.util.ReaderFactory;
 import org.codehaus.plexus.util.StringUtils;
 import org.codehaus.plexus.util.xml.Xpp3Dom;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.util.filter.AndDependencyFilter;
+import org.sonatype.aether.util.graph.PreorderNodeListGenerator;
 
 /**
  * Provides basic services to manage Maven plugins and their mojos. This component is kept general in its design such
@@ -120,17 +124,17 @@ public class DefaultMavenPluginManager
 
     private PluginDescriptorBuilder builder = new PluginDescriptorBuilder();
 
-    public synchronized PluginDescriptor getPluginDescriptor( Plugin plugin, RepositoryRequest repositoryRequest )
+    public synchronized PluginDescriptor getPluginDescriptor( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException, PluginDescriptorParsingException, InvalidPluginDescriptorException
     {
-        PluginDescriptorCache.Key cacheKey = pluginDescriptorCache.createKey( plugin, repositoryRequest );
+        PluginDescriptorCache.Key cacheKey = pluginDescriptorCache.createKey( plugin, repositories, session );
 
         PluginDescriptor pluginDescriptor = pluginDescriptorCache.get( cacheKey );
 
         if ( pluginDescriptor == null )
         {
             Artifact pluginArtifact =
-                pluginDependenciesResolver.resolve( plugin, new ArtifactResolutionRequest( repositoryRequest ) );
+                RepositoryUtils.toArtifact( pluginDependenciesResolver.resolve( plugin, repositories, session ) );
 
             pluginDescriptor = extractPluginDescriptor( pluginArtifact, plugin );
 
@@ -239,11 +243,12 @@ public class DefaultMavenPluginManager
         }
     }
 
-    public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, RepositoryRequest repositoryRequest )
+    public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
+                                             RepositorySystemSession session )
         throws MojoNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
         InvalidPluginDescriptorException
     {
-        PluginDescriptor pluginDescriptor = getPluginDescriptor( plugin, repositoryRequest );
+        PluginDescriptor pluginDescriptor = getPluginDescriptor( plugin, repositories, session );
 
         MojoDescriptor mojoDescriptor = pluginDescriptor.getMojo( goal );
 
@@ -256,16 +261,18 @@ public class DefaultMavenPluginManager
     }
 
     public synchronized void setupPluginRealm( PluginDescriptor pluginDescriptor, MavenSession session,
-                                               ClassLoader parent, List<String> imports, ArtifactFilter filter )
+                                               ClassLoader parent, List<String> imports, DependencyFilter filter )
         throws PluginResolutionException, PluginContainerException
     {
         Plugin plugin = pluginDescriptor.getPlugin();
 
         MavenProject project = session.getCurrentProject();
 
-        PluginRealmCache.CacheRecord cacheRecord =
-            pluginRealmCache.get( plugin, parent, imports, filter, session.getLocalRepository(),
-                                  project.getPluginArtifactRepositories() );
+        PluginRealmCache.Key cacheKey =
+            pluginRealmCache.createKey( plugin, parent, imports, filter, project.getRemotePluginRepositories(),
+                                        session.getRepositorySession() );
+
+        PluginRealmCache.CacheRecord cacheRecord = pluginRealmCache.get( cacheKey );
 
         if ( cacheRecord != null )
         {
@@ -277,16 +284,14 @@ public class DefaultMavenPluginManager
             createPluginRealm( pluginDescriptor, session, parent, imports, filter );
 
             cacheRecord =
-                pluginRealmCache.put( plugin, parent, imports, filter, session.getLocalRepository(),
-                                      project.getPluginArtifactRepositories(), pluginDescriptor.getClassRealm(),
-                                      pluginDescriptor.getArtifacts() );
+                pluginRealmCache.put( cacheKey, pluginDescriptor.getClassRealm(), pluginDescriptor.getArtifacts() );
         }
 
         pluginRealmCache.register( project, cacheRecord );
     }
 
     private void createPluginRealm( PluginDescriptor pluginDescriptor, MavenSession session, ClassLoader parent,
-                                    List<String> imports, ArtifactFilter filter )
+                                    List<String> imports, DependencyFilter filter )
         throws PluginResolutionException, PluginContainerException
     {
         Plugin plugin = pluginDescriptor.getPlugin();
@@ -305,42 +310,32 @@ public class DefaultMavenPluginManager
 
         MavenProject project = session.getCurrentProject();
 
-        ArtifactResolutionRequest request = new ArtifactResolutionRequest();
-        request.setLocalRepository( session.getLocalRepository() );
-        request.setRemoteRepositories( project.getPluginArtifactRepositories() );
-        request.setCache( session.getRepositoryCache() );
-        request.setOffline( session.isOffline() );
-        request.setForceUpdate( session.getRequest().isUpdateSnapshots() );
-        request.setServers( session.getRequest().getServers() );
-        request.setMirrors( session.getRequest().getMirrors() );
-        request.setProxies( session.getRequest().getProxies() );
-        request.setTransferListener( session.getRequest().getTransferListener() );
+        DependencyFilter dependencyFilter = project.getExtensionDependencyFilter();
+        dependencyFilter = AndDependencyFilter.newInstance( dependencyFilter, filter );
 
-        ArtifactFilter dependencyFilter = project.getExtensionArtifactFilter();
-        if ( dependencyFilter == null )
+        DependencyNode root =
+            pluginDependenciesResolver.resolve( plugin, RepositoryUtils.toArtifact( pluginArtifact ), dependencyFilter,
+                                                project.getRemotePluginRepositories(), session.getRepositorySession() );
+
+        PreorderNodeListGenerator nlg = new PreorderNodeListGenerator();
+        root.accept( nlg );
+
+        List<Artifact> exposedPluginArtifacts = new ArrayList<Artifact>( nlg.getNodes().size() );
+        RepositoryUtils.toArtifacts( exposedPluginArtifacts, Collections.singleton( root ),
+                                     Collections.<String> emptyList(), null );
+        for ( Iterator<Artifact> it = exposedPluginArtifacts.iterator(); it.hasNext(); )
         {
-            dependencyFilter = filter;
+            Artifact artifact = it.next();
+            if ( artifact.getFile() == null )
+            {
+                it.remove();
             }
-        else if ( filter != null )
-        {
-            dependencyFilter = new AndArtifactFilter( Arrays.asList( dependencyFilter, filter ) );
         }
 
-        List<Artifact> pluginArtifacts =
-            pluginDependenciesResolver.resolve( plugin, pluginArtifact, request, dependencyFilter );
+        List<org.sonatype.aether.artifact.Artifact> pluginArtifacts = nlg.getArtifacts( true );
 
         ClassRealm pluginRealm = classRealmManager.createPluginRealm( plugin, parent, imports, pluginArtifacts );
 
-        List<Artifact> exposedPluginArtifacts = new ArrayList<Artifact>();
-
-        for ( Artifact artifact : pluginArtifacts )
-        {
-            if ( artifact.getFile() != null )
-            {
-                exposedPluginArtifacts.add( artifact );
-            }
-        }
-
         pluginDescriptor.setClassRealm( pluginRealm );
         pluginDescriptor.setArtifacts( exposedPluginArtifacts );
 

maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultPluginDependenciesResolver.java

@@ -19,28 +19,37 @@ package org.apache.maven.plugin.internal;
  * under the License.
  */
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Set;
 
 import org.apache.maven.ArtifactFilterManager;
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.repository.RepositoryRequest;
-import org.apache.maven.artifact.resolver.ArtifactResolutionException;
-import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
-import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
-import org.apache.maven.artifact.resolver.ResolutionErrorHandler;
-import org.apache.maven.artifact.resolver.filter.AndArtifactFilter;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
-import org.apache.maven.artifact.resolver.filter.ScopeArtifactFilter;
+import org.apache.maven.RepositoryUtils;
 import org.apache.maven.model.Dependency;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.PluginResolutionException;
-import org.apache.maven.repository.RepositorySystem;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
+import org.codehaus.plexus.logging.Logger;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.collection.CollectRequest;
+import org.sonatype.aether.collection.DependencyCollectionException;
+import org.sonatype.aether.collection.DependencyGraphTransformer;
+import org.sonatype.aether.collection.DependencySelector;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.graph.DependencyVisitor;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.resolution.ArtifactRequest;
+import org.sonatype.aether.resolution.ArtifactResolutionException;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.artifact.DefaultArtifact;
+import org.sonatype.aether.util.artifact.JavaScopes;
+import org.sonatype.aether.util.filter.AndDependencyFilter;
+import org.sonatype.aether.util.filter.ExclusionsDependencyFilter;
+import org.sonatype.aether.util.filter.ScopeDependencyFilter;
+import org.sonatype.aether.util.graph.selector.AndDependencySelector;
+import org.sonatype.aether.util.graph.transformer.ChainedDependencyGraphTransformer;
 
 /**
  * Assists in resolving the dependencies of a plugin. <strong>Warning:</strong> This is an internal utility class that
@@ -55,29 +64,32 @@ public class DefaultPluginDependenciesResolver
     implements PluginDependenciesResolver
 {
 
-    @Requirement
-    protected RepositorySystem repositorySystem;
+    private static final String REPOSITORY_CONTEXT = "plugin";
 
     @Requirement
-    private ResolutionErrorHandler resolutionErrorHandler;
+    private Logger logger;
 
     @Requirement
     private ArtifactFilterManager artifactFilterManager;
 
-    public Artifact resolve( Plugin plugin, ArtifactResolutionRequest request )
+    @Requirement
+    private RepositorySystem repoSystem;
+
+    private Artifact toArtifact( Plugin plugin, RepositorySystemSession session )
+    {
+        return new DefaultArtifact( plugin.getGroupId(), plugin.getArtifactId(), null, "jar", plugin.getVersion(),
+                                    session.getArtifactTypeRegistry().get( "maven-plugin" ) );
+    }
+
+    public Artifact resolve( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException
     {
-        Artifact pluginArtifact = repositorySystem.createPluginArtifact( plugin );
-
-        request.setArtifact( pluginArtifact );
-        request.setResolveRoot( true );
-        request.setResolveTransitively( false );
-
-        ArtifactResolutionResult result = repositorySystem.resolve( request );
+        Artifact pluginArtifact = toArtifact( plugin, session );
 
         try
         {
-            resolutionErrorHandler.throwErrors( request, result );
+            ArtifactRequest request = new ArtifactRequest( pluginArtifact, repositories, REPOSITORY_CONTEXT );
+            pluginArtifact = repoSystem.resolveArtifact( session, request ).getArtifact();
         }
         catch ( ArtifactResolutionException e )
         {
@@ -87,96 +99,113 @@ public class DefaultPluginDependenciesResolver
         return pluginArtifact;
     }
 
-    public List<Artifact> resolve( Plugin plugin, Artifact pluginArtifact, ArtifactResolutionRequest request,
-                                   ArtifactFilter dependencyFilter )
+    public DependencyNode resolve( Plugin plugin, Artifact pluginArtifact, DependencyFilter dependencyFilter,
+                                   List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException
     {
         if ( pluginArtifact == null )
         {
-            pluginArtifact = repositorySystem.createPluginArtifact( plugin );
+            pluginArtifact = toArtifact( plugin, session );
         }
 
-        Set<Artifact> overrideArtifacts = new LinkedHashSet<Artifact>();
+        DependencyFilter collectionFilter = new ScopeDependencyFilter( "provided", "test" );
+
+        DependencyFilter resolutionFilter =
+            new ExclusionsDependencyFilter( artifactFilterManager.getCoreArtifactExcludes() );
+        resolutionFilter = AndDependencyFilter.newInstance( resolutionFilter, dependencyFilter );
+        resolutionFilter = new AndDependencyFilter( collectionFilter, resolutionFilter );
+
+        DependencyNode node;
+
+        try
+        {
+            DependencySelector selector =
+                AndDependencySelector.newInstance( session.getDependencySelector(), new WagonExcluder() );
+
+            DependencyGraphTransformer transformer =
+                ChainedDependencyGraphTransformer.newInstance( session.getDependencyGraphTransformer(),
+                                                               new PlexusUtilsInjector() );
+
+            DefaultRepositorySystemSession pluginSession = new DefaultRepositorySystemSession( session );
+            pluginSession.setDependencySelector( selector );
+            pluginSession.setDependencyGraphTransformer( transformer );
+
+            CollectRequest request = new CollectRequest();
+            request.setRequestContext( REPOSITORY_CONTEXT );
+            request.setRepositories( repositories );
+            request.setRoot( new org.sonatype.aether.graph.Dependency( pluginArtifact, null ) );
             for ( Dependency dependency : plugin.getDependencies() )
             {
-	          if ( !Artifact.SCOPE_SYSTEM.equals( dependency.getScope() ) )
+                org.sonatype.aether.graph.Dependency pluginDep =
+                    RepositoryUtils.toDependency( dependency, session.getArtifactTypeRegistry() );
+                if ( !JavaScopes.SYSTEM.equals( pluginDep.getScope() ) )
                 {
-	              dependency.setScope( Artifact.SCOPE_RUNTIME );
+                    pluginDep = pluginDep.setScope( JavaScopes.RUNTIME );
                 }
-            overrideArtifacts.add( repositorySystem.createDependencyArtifact( dependency ) );
+                request.addDependency( pluginDep );
             }
 
-        ArtifactFilter collectionFilter = new ScopeArtifactFilter( Artifact.SCOPE_RUNTIME_PLUS_SYSTEM );
+            node = repoSystem.collectDependencies( pluginSession, request ).getRoot();
 
-        ArtifactFilter resolutionFilter = artifactFilterManager.getCoreArtifactFilter();
-
-        PluginDependencyResolutionListener listener = new PluginDependencyResolutionListener( resolutionFilter );
-
-        if ( dependencyFilter != null )
+            if ( logger.isDebugEnabled() )
             {
-            resolutionFilter = new AndArtifactFilter( Arrays.asList( resolutionFilter, dependencyFilter ) );
+                node.accept( new GraphLogger() );
             }
 
-        request.setArtifact( pluginArtifact );
-        request.setArtifactDependencies( overrideArtifacts );
-        request.setCollectionFilter( collectionFilter );
-        request.setResolutionFilter( resolutionFilter );
-        request.setResolveRoot( true );
-        request.setResolveTransitively( true );
-        request.addListener( listener );
-
-        ArtifactResolutionResult result = repositorySystem.resolve( request );
-
-        try
+            repoSystem.resolveDependencies( session, node, resolutionFilter );
+        }
+        catch ( DependencyCollectionException e )
         {
-            resolutionErrorHandler.throwErrors( request, result );
+            throw new PluginResolutionException( plugin, e );
         }
         catch ( ArtifactResolutionException e )
         {
             throw new PluginResolutionException( plugin, e );
         }
 
-        List<Artifact> pluginArtifacts = new ArrayList<Artifact>( result.getArtifacts() );
-
-        listener.removeBannedDependencies( pluginArtifacts );
-
-        addPlexusUtils( pluginArtifacts, plugin, request );
-
-        return pluginArtifacts;
+        return node;
     }
 
-    // backward-compatibility with Maven 2.x
-    private void addPlexusUtils( List<Artifact> pluginArtifacts, Plugin plugin, RepositoryRequest repositoryRequest )
-        throws PluginResolutionException
+    class GraphLogger
+        implements DependencyVisitor
     {
-        for ( Artifact artifact : pluginArtifacts )
+
+        private String indent = "";
+
+        public boolean visitEnter( DependencyNode node )
         {
-            if ( "org.codehaus.plexus:plexus-utils:jar".equals( artifact.getDependencyConflictId() ) )
+            StringBuilder buffer = new StringBuilder( 128 );
+            buffer.append( indent );
+            org.sonatype.aether.graph.Dependency dep = node.getDependency();
+            if ( dep != null )
             {
-                return;
-            }
-        }
+                org.sonatype.aether.artifact.Artifact art = dep.getArtifact();
 
-        Artifact plexusUtils =
-            repositorySystem.createArtifact( "org.codehaus.plexus", "plexus-utils", "1.1", Artifact.SCOPE_RUNTIME,
-                                             "jar" );
+                buffer.append( art );
+                buffer.append( ':' ).append( dep.getScope() );
 
-        ArtifactResolutionRequest request = new ArtifactResolutionRequest( repositoryRequest );
-        request.setArtifact( plexusUtils );
-        request.setResolveRoot( true );
-        request.setResolveTransitively( false );
-
-        ArtifactResolutionResult result = repositorySystem.resolve( request );
-        try
+                if ( node.getPremanagedScope() != null && !node.getPremanagedScope().equals( dep.getScope() ) )
                 {
-            resolutionErrorHandler.throwErrors( request, result );
+                    buffer.append( " (scope managed from " ).append( node.getPremanagedScope() ).append( ")" );
                 }
-        catch ( ArtifactResolutionException e )
+
+                if ( node.getPremanagedVersion() != null && !node.getPremanagedVersion().equals( art.getVersion() ) )
                 {
-            throw new PluginResolutionException( plugin, e );
+                    buffer.append( " (version managed from " ).append( node.getPremanagedVersion() ).append( ")" );
+                }
+            }
+
+            logger.debug( buffer.toString() );
+            indent += "   ";
+            return true;
+        }
+
+        public boolean visitLeave( DependencyNode node )
+        {
+            indent = indent.substring( 0, indent.length() - 3 );
+            return true;
         }
 
-        pluginArtifacts.add( plexusUtils );
     }
 
 }

maven-core/src/main/java/org/apache/maven/plugin/internal/DefaultPluginManager.java

@@ -22,8 +22,6 @@ package org.apache.maven.plugin.internal;
 import java.util.Map;
 
 import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
 import org.apache.maven.artifact.resolver.ArtifactResolutionException;
 import org.apache.maven.artifact.versioning.InvalidVersionSpecificationException;
@@ -100,10 +98,9 @@ public class DefaultPluginManager
         PluginDescriptor pluginDescriptor;
         try
         {
-            RepositoryRequest repositoryRequest =
-                DefaultRepositoryRequest.getRepositoryRequest( session, session.getCurrentProject() );
-
-            pluginDescriptor = pluginManager.getPluginDescriptor( plugin, repositoryRequest );
+            pluginDescriptor =
+                pluginManager.getPluginDescriptor( plugin, session.getCurrentProject().getRemotePluginRepositories(),
+                                                   session.getRepositorySession() );
 
             pluginManager.setupPluginRealm( pluginDescriptor, session, null, null, null );
         }
@@ -133,10 +130,9 @@ public class DefaultPluginManager
         PluginDescriptor pluginDescriptor;
         try
         {
-            RepositoryRequest repositoryRequest =
-                DefaultRepositoryRequest.getRepositoryRequest( session, session.getCurrentProject() );
-
-            pluginDescriptor = pluginManager.getPluginDescriptor( plugin, repositoryRequest );
+            pluginDescriptor =
+                pluginManager.getPluginDescriptor( plugin, session.getCurrentProject().getRemotePluginRepositories(),
+                                                   session.getRepositorySession() );
 
             pluginManager.setupPluginRealm( pluginDescriptor, session, null, null, null );
         }
@@ -234,24 +230,24 @@ public class DefaultPluginManager
         InvalidVersionSpecificationException, InvalidPluginException, PluginManagerException, PluginNotFoundException,
         PluginVersionNotFoundException
     {
-        RepositoryRequest repositoryRequest = new DefaultRepositoryRequest();
-        repositoryRequest.setLocalRepository( localRepository );
-        repositoryRequest.setRemoteRepositories( project.getPluginArtifactRepositories() );
-        repositoryRequest.setOffline( settings.isOffline() );
+        MavenSession session = legacySupport.getSession();
 
         if ( plugin.getVersion() == null )
         {
-            PluginVersionRequest versionRequest = new DefaultPluginVersionRequest( plugin, repositoryRequest );
+            PluginVersionRequest versionRequest =
+                new DefaultPluginVersionRequest( plugin, session.getRepositorySession(),
+                                                 project.getRemotePluginRepositories() );
             plugin.setVersion( pluginVersionResolver.resolve( versionRequest ).getVersion() );
         }
 
         try
         {
-            return pluginManager.getPluginDescriptor( plugin, repositoryRequest );
+            return pluginManager.getPluginDescriptor( plugin, project.getRemotePluginRepositories(),
+                                                      session.getRepositorySession() );
         }
         catch ( PluginResolutionException e )
         {
-            throw new PluginNotFoundException( plugin, repositoryRequest.getRemoteRepositories() );
+            throw new PluginNotFoundException( plugin, project.getPluginArtifactRepositories() );
         }
         catch ( PluginDescriptorParsingException e )
         {

maven-core/src/main/java/org/apache/maven/plugin/internal/PlexusUtilsInjector.java

@@ -0,0 +1,87 @@
+package org.apache.maven.plugin.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.sonatype.aether.RepositoryException;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.collection.DependencyGraphTransformationContext;
+import org.sonatype.aether.collection.DependencyGraphTransformer;
+import org.sonatype.aether.graph.Dependency;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.util.artifact.DefaultArtifact;
+import org.sonatype.aether.util.artifact.JavaScopes;
+import org.sonatype.aether.util.graph.DefaultDependencyNode;
+
+/**
+ * Injects plexus-utils:1.1 into a plugin's class path if it doesn't already declare a dependency on plexus-utils. This
+ * is another legacy bit to provide backward-compat with Maven 2.x.
+ * 
+ * @author Benjamin Bentmann
+ */
+class PlexusUtilsInjector
+    implements DependencyGraphTransformer
+{
+
+    private static final String GID = "org.codehaus.plexus";
+
+    private static final String AID = "plexus-utils";
+
+    private static final String VER = "1.1";
+
+    private static final String EXT = "jar";
+
+    public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context )
+        throws RepositoryException
+    {
+        if ( findPlexusUtils( node ) == null )
+        {
+            Artifact pu = new DefaultArtifact( GID, AID, null, EXT, VER );
+            DefaultDependencyNode child = new DefaultDependencyNode( new Dependency( pu, JavaScopes.RUNTIME ) );
+            child.setRepositories( node.getRepositories() );
+            child.setRequestContext( node.getRequestContext() );
+            node.getChildren().add( child );
+        }
+
+        return node;
+    }
+
+    private DependencyNode findPlexusUtils( DependencyNode node )
+    {
+        Artifact artifact = node.getDependency().getArtifact();
+
+        if ( AID.equals( artifact.getArtifactId() ) && GID.equals( artifact.getGroupId() )
+            && EXT.equals( artifact.getExtension() ) && "".equals( artifact.getClassifier() ) )
+        {
+            return node;
+        }
+
+        for ( DependencyNode child : node.getChildren() )
+        {
+            DependencyNode result = findPlexusUtils( child );
+            if ( result != null )
+            {
+                return result;
+            }
+        }
+
+        return null;
+    }
+
+}

maven-core/src/main/java/org/apache/maven/plugin/internal/PluginDependenciesResolver.java

@@ -21,11 +21,13 @@ package org.apache.maven.plugin.internal;
 
 import java.util.List;
 
-import org.apache.maven.artifact.Artifact;
-import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
-import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.PluginResolutionException;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.graph.DependencyFilter;
+import org.sonatype.aether.graph.DependencyNode;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Assists in resolving the dependencies of a plugin. <strong>Warning:</strong> This is an internal utility interface
@@ -42,12 +44,13 @@ public interface PluginDependenciesResolver
      * Resolves the main artifact of the specified plugin.
      * 
      * @param plugin The plugin for which to resolve the main artifact, must not be {@code null}.
-     * @param request A prepopulated resolution request that will be completed and used for the resolution, must not be
-     *            {@code null}.
+     * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
+     *            null}.
+     * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
      * @return The resolved plugin artifact, never {@code null}.
      * @throws PluginResolutionException If the plugin artifact could not be resolved.
      */
-    Artifact resolve( Plugin plugin, ArtifactResolutionRequest request )
+    public Artifact resolve( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException;
 
     /**
@@ -55,14 +58,14 @@ public interface PluginDependenciesResolver
      * 
      * @param plugin The plugin for which to resolve the dependencies, must not be {@code null}.
      * @param pluginArtifact The plugin's main artifact, may be {@code null}.
-     * @param request A prepopulated resolution request that will be completed and used for the resolution, must not be
-     *            {@code null}.
-     * @param dependencyFilter A filter to exclude artifacts from resolution, may be {@code null}.
-     * @return The list of artifacts denoting the resolved plugin class path, never {@code null}.
+     * @param dependencyFilter A filter to exclude artifacts from resolution (but not collection), may be {@code null}.
+     * @param repositories The plugin repositories to use for resolving the plugin artifacts, must not be {@code null}.
+     * @param session The repository session to use for resolving the plugin artifacts, must not be {@code null}.
+     * @return The dependency tree denoting the resolved plugin class path, never {@code null}.
      * @throws PluginResolutionException If any dependency could not be resolved.
      */
-    List<Artifact> resolve( Plugin plugin, Artifact pluginArtifact, ArtifactResolutionRequest request,
-                            ArtifactFilter dependencyFilter )
+    DependencyNode resolve( Plugin plugin, Artifact pluginArtifact, DependencyFilter dependencyFilter,
+                            List<RemoteRepository> repositories, RepositorySystemSession session )
         throws PluginResolutionException;
 
 }

maven-core/src/main/java/org/apache/maven/plugin/internal/WagonExcluder.java

@@ -0,0 +1,109 @@
+package org.apache.maven.plugin.internal;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.sonatype.aether.artifact.Artifact;
+import org.sonatype.aether.collection.DependencyCollectionContext;
+import org.sonatype.aether.collection.DependencySelector;
+import org.sonatype.aether.graph.Dependency;
+
+/**
+ * Assists in detecting wagon providers brought into the plugin class path via legacy Maven core artifacts (e.g.
+ * maven-core:2.0.6) and excluding them. A plugin should be able to explicitly declare dependencies on specific wagons
+ * for its use. However, the (old) wagons pulled in transitively via legacy Maven core artifacts are usually not
+ * intended as dependencies and more importantly screw up artifact resolution because they would get preferred over the
+ * core wagon versions. This is a hack to provide backward-compat with Maven 2 (MNG-4528, MNG-4561).
+ * 
+ * @author Benjamin Bentmann
+ */
+class WagonExcluder
+    implements DependencySelector
+{
+
+    private final boolean coreArtifact;
+
+    public WagonExcluder()
+    {
+        this( false );
+    }
+
+    private WagonExcluder( boolean coreArtifact )
+    {
+        this.coreArtifact = coreArtifact;
+    }
+
+    public boolean selectDependency( Dependency dependency )
+    {
+        return !coreArtifact || !isWagonProvider( dependency.getArtifact() );
+    }
+
+    public DependencySelector deriveChildSelector( DependencyCollectionContext context )
+    {
+        if ( coreArtifact || !isLegacyCoreArtifact( context.getDependency().getArtifact() ) )
+        {
+            return this;
+        }
+        else
+        {
+            return new WagonExcluder( true );
+        }
+    }
+
+    private boolean isLegacyCoreArtifact( Artifact artifact )
+    {
+        String version = artifact.getVersion();
+        return version != null && version.startsWith( "2." ) && artifact.getArtifactId().startsWith( "maven-" )
+            && artifact.getGroupId().equals( "org.apache.maven" );
+    }
+
+    private boolean isWagonProvider( Artifact artifact )
+    {
+        if ( "org.apache.maven.wagon".equals( artifact.getGroupId() ) )
+        {
+            return artifact.getArtifactId().startsWith( "wagon-" );
+        }
+        return false;
+    }
+
+    @Override
+    public boolean equals( Object obj )
+    {
+        if ( obj == this )
+        {
+            return true;
+        }
+        else if ( obj == null || !getClass().equals( obj.getClass() ) )
+        {
+            return false;
+        }
+
+        WagonExcluder that = (WagonExcluder) obj;
+        return coreArtifact == that.coreArtifact;
+    }
+
+    @Override
+    public int hashCode()
+    {
+        int hash = getClass().hashCode();
+        hash = hash * 31 + ( coreArtifact ? 1 : 0 );
+        return hash;
+    }
+
+}

maven-core/src/main/java/org/apache/maven/plugin/prefix/DefaultPluginPrefixRequest.java

@@ -19,17 +19,14 @@ package org.apache.maven.plugin.prefix;
  * under the License.
  */
 
-import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
-import org.apache.maven.artifact.repository.RepositoryCache;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Model;
 import org.apache.maven.project.MavenProject;
-import org.apache.maven.repository.ArtifactTransferListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Collects settings required to resolve a plugin prefix.
@@ -43,34 +40,25 @@ public class DefaultPluginPrefixRequest
 
     private String prefix;
 
-    private List<String> pluginGroups;
+    private List<String> pluginGroups = Collections.emptyList();
 
     private Model pom;
 
-    private RepositoryRequest repositoryRequest;
+    private List<RemoteRepository> repositories = Collections.emptyList();
+
+    private RepositorySystemSession session;
 
     /**
      * Creates an empty request.
      */
     public DefaultPluginPrefixRequest()
     {
-        repositoryRequest = new DefaultRepositoryRequest();
-    }
-
-    /**
-     * Creates a request by copying settings from the specified repository request.
-     * 
-     * @param repositoryRequest The repository request to copy from, must not be {@code null}.
-     */
-    public DefaultPluginPrefixRequest( RepositoryRequest repositoryRequest )
-    {
-        this.repositoryRequest = new DefaultRepositoryRequest( repositoryRequest );
     }
 
     /**
      * Creates a request for the specified plugin prefix and build session. The provided build session will be used to
-     * configure repository settings. If the session has a current project, its plugin artifact repositories and model
-     * will be used as well.
+     * configure repository settings. If the session has a current project, its plugin repositories and model will be
+     * used as well.
      * 
      * @param prefix The plugin prefix to resolve, must not be {@code null}.
      * @param session The build session from which to derive further settings, must not be {@code null}.
@@ -79,18 +67,12 @@ public class DefaultPluginPrefixRequest
     {
         setPrefix( prefix );
 
-        this.repositoryRequest = new DefaultRepositoryRequest();
-
-        setCache( session.getRepositoryCache() );
-        setLocalRepository( session.getLocalRepository() );
-        setOffline( session.isOffline() );
-        setForceUpdate( session.getRequest().isUpdateSnapshots() );
-        setTransferListener( session.getRequest().getTransferListener() );
+        setRepositorySession( session.getRepositorySession() );
 
         MavenProject project = session.getCurrentProject();
         if ( project != null )
         {
-            setRemoteRepositories( project.getPluginArtifactRepositories() );
+            setRepositories( project.getRemotePluginRepositories() );
             setPom( project.getModel() );
         }
 
@@ -111,17 +93,19 @@ public class DefaultPluginPrefixRequest
 
     public List<String> getPluginGroups()
     {
-        if ( pluginGroups == null )
-        {
-            pluginGroups = new ArrayList<String>();
-        }
-
         return pluginGroups;
     }
 
     public DefaultPluginPrefixRequest setPluginGroups( List<String> pluginGroups )
+    {
+        if ( pluginGroups != null )
         {
             this.pluginGroups = pluginGroups;
+        }
+        else
+        {
+            this.pluginGroups = Collections.emptyList();
+        }
 
         return this;
     }
@@ -138,74 +122,33 @@ public class DefaultPluginPrefixRequest
         return this;
     }
 
-    public RepositoryCache getCache()
+    public List<RemoteRepository> getRepositories()
     {
-        return repositoryRequest.getCache();
+        return repositories;
     }
 
-    public DefaultPluginPrefixRequest setCache( RepositoryCache cache )
+    public DefaultPluginPrefixRequest setRepositories( List<RemoteRepository> repositories )
     {
-        repositoryRequest.setCache( cache );
+        if ( repositories != null )
+        {
+            this.repositories = repositories;
+        }
+        else
+        {
+            this.repositories = Collections.emptyList();
+        }
 
         return this;
     }
 
-    public ArtifactRepository getLocalRepository()
+    public RepositorySystemSession getRepositorySession()
     {
-        return repositoryRequest.getLocalRepository();
+        return session;
     }
 
-    public DefaultPluginPrefixRequest setLocalRepository( ArtifactRepository localRepository )
+    public DefaultPluginPrefixRequest setRepositorySession( RepositorySystemSession session )
     {
-        repositoryRequest.setLocalRepository( localRepository );
-
-        return this;
-    }
-
-    public List<ArtifactRepository> getRemoteRepositories()
-    {
-        return repositoryRequest.getRemoteRepositories();
-    }
-
-    public DefaultPluginPrefixRequest setRemoteRepositories( List<ArtifactRepository> remoteRepositories )
-    {
-        repositoryRequest.setRemoteRepositories( remoteRepositories );
-
-        return this;
-    }
-
-    public boolean isOffline()
-    {
-        return repositoryRequest.isOffline();
-    }
-
-    public DefaultPluginPrefixRequest setOffline( boolean offline )
-    {
-        repositoryRequest.setOffline( offline );
-
-        return this;
-    }
-
-    public boolean isForceUpdate()
-    {
-        return repositoryRequest.isForceUpdate();
-    }
-
-    public DefaultPluginPrefixRequest setForceUpdate( boolean forceUpdate )
-    {
-        repositoryRequest.setForceUpdate( forceUpdate );
-
-        return this;
-    }
-
-    public ArtifactTransferListener getTransferListener()
-    {
-        return repositoryRequest.getTransferListener();
-    }
-
-    public DefaultPluginPrefixRequest setTransferListener( ArtifactTransferListener transferListener )
-    {
-        repositoryRequest.setTransferListener( transferListener );
+        this.session = session;
 
         return this;
     }

maven-core/src/main/java/org/apache/maven/plugin/prefix/NoPluginFoundForPrefixException.java

@@ -21,29 +21,21 @@ package org.apache.maven.plugin.prefix;
 
 import java.util.List;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.sonatype.aether.repository.LocalRepository;
+import org.sonatype.aether.repository.RemoteRepository;
 
 public class NoPluginFoundForPrefixException
     extends Exception
 {
-    private String prefix;
 
-    private ArtifactRepository localRepository;
-    
-    private List<ArtifactRepository> remoteRepositories;
-    
-    public NoPluginFoundForPrefixException( String prefix, List<String> pluginGroups,
-                                            ArtifactRepository localRepository,
-                                            List<ArtifactRepository> remoteRepositories )
+    public NoPluginFoundForPrefixException( String prefix, List<String> pluginGroups, LocalRepository localRepository,
+                                            List<RemoteRepository> remoteRepositories )
     {
         super( "No plugin found for prefix '" + prefix + "' in the current project and in the plugin groups "
             + pluginGroups + " available from the repositories " + format( localRepository, remoteRepositories ) );
-        this.prefix = prefix;
-        this.localRepository = localRepository;
-        this.remoteRepositories = remoteRepositories;
     }
 
-    private static String format( ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories )
+    private static String format( LocalRepository localRepository, List<RemoteRepository> remoteRepositories )
     {
         String repos = "[";
 
@@ -54,7 +46,7 @@ public class NoPluginFoundForPrefixException
 
         if ( remoteRepositories != null && !remoteRepositories.isEmpty() )
         {
-            for ( ArtifactRepository repository : remoteRepositories )
+            for ( RemoteRepository repository : remoteRepositories )
             {
                 repos += ", ";
 

maven-core/src/main/java/org/apache/maven/plugin/prefix/PluginPrefixRequest.java

@@ -21,11 +21,9 @@ package org.apache.maven.plugin.prefix;
 
 import java.util.List;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.RepositoryCache;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.model.Model;
-import org.apache.maven.repository.ArtifactTransferListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Collects settings required to resolve a plugin prefix.
@@ -34,7 +32,6 @@ import org.apache.maven.repository.ArtifactTransferListener;
  * @author Benjamin Bentmann
  */
 public interface PluginPrefixRequest
-    extends RepositoryRequest
 {
 
     /**
@@ -84,80 +81,35 @@ public interface PluginPrefixRequest
      */
     PluginPrefixRequest setPom( Model pom );
 
-    /**
-     * Indicates whether network access to remote repositories has been disabled.
-     * 
-     * @return {@code true} if remote access has been disabled, {@code false} otherwise.
-     */
-    boolean isOffline();
-
-    /**
-     * Enables/disables network access to remote repositories.
-     * 
-     * @param offline {@code true} to disable remote access, {@code false} to allow network access.
-     * @return This request, never {@code null}.
-     */
-    PluginPrefixRequest setOffline( boolean offline );
-
-    /**
-     * Gets the local repository to use.
-     * 
-     * @return The local repository to use or {@code null} if not set.
-     */
-    ArtifactRepository getLocalRepository();
-
-    /**
-     * Sets the local repository to use.
-     * 
-     * @param localRepository The local repository to use.
-     * @return This request, never {@code null}.
-     */
-    PluginPrefixRequest setLocalRepository( ArtifactRepository localRepository );
-
     /**
      * Gets the remote repositories to use.
      * 
      * @return The remote repositories to use, never {@code null}.
      */
-    List<ArtifactRepository> getRemoteRepositories();
+    List<RemoteRepository> getRepositories();
 
     /**
      * Sets the remote repositories to use. <em>Note:</em> When creating a request from a project, be sure to use the
-     * plugin artifact repositories and not the regular artifact repositories.
+     * plugin repositories and not the regular project repositories.
      * 
-     * @param remoteRepositories The remote repositories to use.
+     * @param repositories The remote repositories to use.
      * @return This request, never {@code null}.
      */
-    PluginPrefixRequest setRemoteRepositories( List<ArtifactRepository> remoteRepositories );
+    PluginPrefixRequest setRepositories( List<RemoteRepository> repositories );
 
     /**
-     * Gets the repository cache to use.
+     * Gets the session to use for repository access.
      * 
-     * @return The repository cache to use or {@code null} if none.
+     * @return The repository session or {@code null} if not set.
      */
-    RepositoryCache getCache();
+    RepositorySystemSession getRepositorySession();
 
     /**
-     * Sets the repository cache to use.
+     * Sets the session to use for repository access.
      * 
-     * @param cache The repository cache to use, may be {@code null}.
+     * @param repositorySession The repository session to use.
      * @return This request, never {@code null}.
      */
-    PluginPrefixRequest setCache( RepositoryCache cache );
-
-    /**
-     * Gets the listener to notify of transfer events.
-     * 
-     * @return The transfer listener or {@code null} if none.
-     */
-    ArtifactTransferListener getTransferListener();
-
-    /**
-     * Sets the listener to notify of transfer events.
-     * 
-     * @param transferListener The transfer listener to notify, may be {@code null}.
-     * @return This request, never {@code null}.
-     */
-    PluginPrefixRequest setTransferListener( ArtifactTransferListener transferListener );
+    PluginPrefixRequest setRepositorySession( RepositorySystemSession repositorySession );
 
 }

maven-core/src/main/java/org/apache/maven/plugin/prefix/PluginPrefixResult.java

@@ -1,5 +1,7 @@
 package org.apache.maven.plugin.prefix;
 
+import org.sonatype.aether.repository.ArtifactRepository;
+
 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
@@ -19,8 +21,6 @@ package org.apache.maven.plugin.prefix;
  * under the License.
  */
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
-
 /**
  * Describes the result of a plugin prefix resolution request.
  * 

maven-core/src/main/java/org/apache/maven/plugin/prefix/internal/DefaultPluginPrefixResolver.java

@@ -23,11 +23,9 @@ import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.artifact.repository.metadata.Metadata;
 import org.apache.maven.artifact.repository.metadata.io.MetadataReader;
 import org.apache.maven.model.Build;
@@ -38,12 +36,18 @@ import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
 import org.apache.maven.plugin.prefix.PluginPrefixRequest;
 import org.apache.maven.plugin.prefix.PluginPrefixResolver;
 import org.apache.maven.plugin.prefix.PluginPrefixResult;
-import org.apache.maven.repository.RepositorySystem;
-import org.apache.maven.repository.ArtifactDoesNotExistException;
-import org.apache.maven.repository.ArtifactTransferFailedException;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
 import org.codehaus.plexus.logging.Logger;
+import org.sonatype.aether.RepositorySystem;
+import org.sonatype.aether.repository.ArtifactRepository;
+import org.sonatype.aether.repository.RemoteRepository;
+import org.sonatype.aether.repository.RepositoryPolicy;
+import org.sonatype.aether.resolution.MetadataRequest;
+import org.sonatype.aether.resolution.MetadataResult;
+import org.sonatype.aether.transfer.MetadataNotFoundException;
+import org.sonatype.aether.util.DefaultRepositorySystemSession;
+import org.sonatype.aether.util.metadata.DefaultMetadata;
 
 /**
  * Resolves a plugin prefix.
@@ -56,6 +60,8 @@ public class DefaultPluginPrefixResolver
     implements PluginPrefixResolver
 {
 
+    private static final String REPOSITORY_CONTEXT = "plugin";
+
     @Requirement
     private Logger logger;
 
@@ -82,8 +88,8 @@ public class DefaultPluginPrefixResolver
             if ( result == null )
             {
                 throw new NoPluginFoundForPrefixException( request.getPrefix(), request.getPluginGroups(),
-                                                           request.getLocalRepository(),
-                                                           request.getRemoteRepositories() );
+                                                           request.getRepositorySession().getLocalRepository(),
+                                                           request.getRepositories() );
             }
             else if ( logger.isDebugEnabled() )
             {
@@ -126,7 +132,8 @@ public class DefaultPluginPrefixResolver
         {
             try
             {
-                PluginDescriptor pluginDescriptor = pluginManager.loadPlugin( plugin, request );
+                PluginDescriptor pluginDescriptor =
+                    pluginManager.loadPlugin( plugin, request.getRepositories(), request.getRepositorySession() );
 
                 if ( request.getPrefix().equals( pluginDescriptor.getGoalPrefix() ) )
                 {
@@ -152,19 +159,85 @@ public class DefaultPluginPrefixResolver
 
     private PluginPrefixResult resolveFromRepository( PluginPrefixRequest request )
     {
-        ArtifactRepository localRepository = request.getLocalRepository();
+        List<MetadataRequest> requests = new ArrayList<MetadataRequest>();
 
-        // Process all plugin groups in the local repository first to see if we get a hit. A developer may have been
-        // developing a plugin locally and installing.
-        //
         for ( String pluginGroup : request.getPluginGroups() )
         {
-            String localPath = getLocalMetadataPath( pluginGroup, localRepository );
+            org.sonatype.aether.metadata.Metadata metadata =
+                new DefaultMetadata( pluginGroup, "maven-metadata.xml", DefaultMetadata.Nature.RELEASE_OR_SNAPSHOT );
 
-            File groupMetadataFile = new File( localRepository.getBasedir(), localPath );
+            requests.add( new MetadataRequest( metadata, null, REPOSITORY_CONTEXT ) );
+
+            for ( RemoteRepository repository : request.getRepositories() )
+            {
+                requests.add( new MetadataRequest( metadata, repository, REPOSITORY_CONTEXT ) );
+            }
+        }
+
+        // initial try, use locally cached metadata
+
+        List<MetadataResult> results = repositorySystem.resolveMetadata( request.getRepositorySession(), requests );
+        requests.clear();
+
+        PluginPrefixResult result = processResults( request, results, requests );
+
+        if ( result != null )
+        {
+            return result;
+        }
+
+        // second try, refetch all (possibly outdated) metadata that wasn't updated in the first attempt
+
+        if ( !request.getRepositorySession().isOffline() && !requests.isEmpty() )
+        {
+            DefaultRepositorySystemSession session =
+                new DefaultRepositorySystemSession( request.getRepositorySession() );
+            session.setUpdatePolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
+
+            results = repositorySystem.resolveMetadata( session, requests );
+
+            return processResults( request, results, null );
+        }
+
+        return null;
+    }
+
+    private PluginPrefixResult processResults( PluginPrefixRequest request, List<MetadataResult> results,
+                                               List<MetadataRequest> requests )
+    {
+        for ( MetadataResult res : results )
+        {
+            if ( res.getException() != null )
+            {
+                if ( res.getException() instanceof MetadataNotFoundException )
+                {
+                    logger.debug( "Could not find " + res.getRequest().getMetadata() + " in "
+                        + res.getRequest().getRepository() );
+                }
+                else if ( logger.isDebugEnabled() )
+                {
+                    logger.warn( "Could not retrieve " + res.getRequest().getMetadata() + " from "
+                        + res.getRequest().getRepository() + ": " + res.getException().getMessage(), res.getException() );
+                }
+                else
+                {
+                    logger.warn( "Could not retrieve " + res.getRequest().getMetadata() + " from "
+                        + res.getRequest().getRepository() + ": " + res.getException().getMessage() );
+                }
+            }
+
+            org.sonatype.aether.metadata.Metadata metadata = res.getMetadata();
+
+            if ( metadata != null )
+            {
+                ArtifactRepository repository = res.getRequest().getRepository();
+                if ( repository == null )
+                {
+                    repository = request.getRepositorySession().getLocalRepository();
+                }
 
                 PluginPrefixResult result =
-                resolveFromRepository( request, pluginGroup, groupMetadataFile, localRepository );
+                    resolveFromRepository( request, metadata.getGroupId(), metadata.getFile(), repository );
 
                 if ( result != null )
                 {
@@ -172,135 +245,19 @@ public class DefaultPluginPrefixResolver
                 }
             }
 
-        Map<String, List<ArtifactRepository>> recheck = new HashMap<String, List<ArtifactRepository>>();
-
-        // Process all the remote repositories.
-        //
-        for ( String pluginGroup : request.getPluginGroups() )
+            if ( requests != null && !res.isUpdated() )
             {
-            for ( ArtifactRepository repository : request.getRemoteRepositories() )
-            {
-                if ( !isEnabled( repository ) )
-                {
-                    logger.debug( "Skipped plugin prefix lookup from disabled repository " + repository.getId() );
-                    continue;
-                }
-
-                String localPath = getLocalMetadataPath( pluginGroup, repository );
-
-                File groupMetadataFile = new File( localRepository.getBasedir(), localPath );
-
-                if ( !request.isOffline() && ( !groupMetadataFile.exists() || request.isForceUpdate() ) )
-                {
-                    String remotePath = getRemoteMetadataPath( pluginGroup, repository );
-
-                    try
-                    {
-                        repositorySystem.retrieve( repository, groupMetadataFile, remotePath,
-                                                   request.getTransferListener() );
-                    }
-                    catch ( ArtifactTransferFailedException e )
-                    {
-                        if ( logger.isDebugEnabled() )
-                        {
-                            logger.warn( "Failed to retrieve " + remotePath + " from " + repository.getId() + ": "
-                                + e.getMessage(), e );
-                        }
-                        else
-                        {
-                            logger.warn( "Failed to retrieve " + remotePath + " from " + repository.getId() + ": "
-                                + e.getMessage() );
-                        }
-                    }
-                    catch ( ArtifactDoesNotExistException e )
-                    {
-                        continue;
-                    }
-                }
-                else if ( !request.isOffline() && !request.isForceUpdate() )
-                {
-                    List<ArtifactRepository> repos = recheck.get( pluginGroup );
-                    if ( repos == null )
-                    {
-                        repos = new ArrayList<ArtifactRepository>();
-                        recheck.put( pluginGroup, repos );
-                    }
-                    repos.add( repository );
-                }
-
-                PluginPrefixResult result = resolveFromRepository( request, pluginGroup, groupMetadataFile,
-                                                                   repository );
-
-                if ( result != null )
-                {
-                    return result;
-                }
-            }
-        }
-
-        // Retry the remote repositories for which we previously only consulted the possibly outdated local cache.
-        //
-        for ( String pluginGroup : request.getPluginGroups() )
-        {
-            List<ArtifactRepository> repos = recheck.get( pluginGroup );
-            if ( repos == null )
-            {
-                continue;
-            }
-
-            for ( ArtifactRepository repository : repos )
-            {
-                String localPath = getLocalMetadataPath( pluginGroup, repository );
-
-                File groupMetadataFile = new File( localRepository.getBasedir(), localPath );
-
-                String remotePath = getRemoteMetadataPath( pluginGroup, repository );
-
-                try
-                {
-                    repositorySystem.retrieve( repository, groupMetadataFile, remotePath,
-                                               request.getTransferListener() );
-                }
-                catch ( ArtifactTransferFailedException e )
-                {
-                    if ( logger.isDebugEnabled() )
-                    {
-                        logger.warn( "Failed to retrieve " + remotePath + " from " + repository.getId() + ": "
-                            + e.getMessage(), e );
-                    }
-                    else
-                    {
-                        logger.warn( "Failed to retrieve " + remotePath + " from " + repository.getId() + ": "
-                            + e.getMessage() );
-                    }
-                }
-                catch ( ArtifactDoesNotExistException e )
-                {
-                    continue;
-                }
-
-                PluginPrefixResult result = resolveFromRepository( request, pluginGroup, groupMetadataFile,
-                                                                   repository );
-
-                if ( result != null )
-                {
-                    return result;
-                }
+                requests.add( res.getRequest() );
             }
         }
 
         return null;
     }
 
-    private boolean isEnabled( ArtifactRepository repository )
-    {
-        return repository.getReleases().isEnabled() || repository.getSnapshots().isEnabled();
-    }
-
     private PluginPrefixResult resolveFromRepository( PluginPrefixRequest request, String pluginGroup,
                                                       File metadataFile, ArtifactRepository repository )
     {
-        if ( metadataFile.isFile() )
+        if ( metadataFile != null && metadataFile.isFile() )
         {
             try
             {
@@ -337,14 +294,4 @@ public class DefaultPluginPrefixResolver
         return null;
     }
 
-    private String getLocalMetadataPath( String groupId, ArtifactRepository repository )
-    {
-        return groupId.replace( '.', '/' ) + "/" + "maven-metadata-" + repository.getId() + ".xml";
-    }
-
-    private String getRemoteMetadataPath( String groupId, ArtifactRepository repository )
-    {
-        return groupId.replace( '.', '/' ) + "/" + "maven-metadata.xml";
-    }
-
 }

maven-core/src/main/java/org/apache/maven/plugin/prefix/internal/DefaultPluginPrefixResult.java

@@ -19,9 +19,9 @@ package org.apache.maven.plugin.prefix.internal;
  * under the License.
  */
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.prefix.PluginPrefixResult;
+import org.sonatype.aether.repository.ArtifactRepository;
 
 /**
  * Describes the result of a plugin prefix resolution request.

maven-core/src/main/java/org/apache/maven/plugin/version/DefaultPluginVersionRequest.java

@@ -19,17 +19,15 @@ package org.apache.maven.plugin.version;
  * under the License.
  */
 
+import java.util.Collections;
 import java.util.List;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
-import org.apache.maven.artifact.repository.RepositoryCache;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.execution.MavenSession;
 import org.apache.maven.model.Model;
 import org.apache.maven.model.Plugin;
 import org.apache.maven.project.MavenProject;
-import org.apache.maven.repository.ArtifactTransferListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Collects settings required to resolve the version for a plugin.
@@ -47,65 +45,55 @@ public class DefaultPluginVersionRequest
 
     private Model pom;
 
-    private RepositoryRequest repositoryRequest;
+    private List<RemoteRepository> repositories = Collections.emptyList();
+
+    private RepositorySystemSession session;
 
     /**
      * Creates an empty request.
      */
     public DefaultPluginVersionRequest()
     {
-        repositoryRequest = new DefaultRepositoryRequest();
-    }
-
-    /**
-     * Creates a request by copying settings from the specified repository request.
-     * 
-     * @param repositoryRequest The repository request to copy from, must not be {@code null}.
-     */
-    public DefaultPluginVersionRequest( RepositoryRequest repositoryRequest )
-    {
-        this.repositoryRequest = new DefaultRepositoryRequest( repositoryRequest );
-    }
-
-    /**
-     * Creates a request for the specified plugin by copying settings from the specified repository request.
-     * 
-     * @param The plugin for which to resolve a version, must not be {@code null}.
-     * @param repositoryRequest The repository request to copy from, must not be {@code null}.
-     */
-    public DefaultPluginVersionRequest( Plugin plugin, RepositoryRequest repositoryRequest )
-    {
-        this.groupId = plugin.getGroupId();
-        this.artifactId = plugin.getArtifactId();
-        this.repositoryRequest = new DefaultRepositoryRequest( repositoryRequest );
     }
 
     /**
      * Creates a request for the specified plugin by copying settings from the specified build session. If the session
-     * has a current project, its plugin artifact repositories will be used as well.
+     * has a current project, its plugin repositories will be used as well.
      * 
-     * @param The plugin for which to resolve a version, must not be {@code null}.
+     * @param plugin The plugin for which to resolve a version, must not be {@code null}.
      * @param repositoryRequest The repository request to copy from, must not be {@code null}.
      */
     public DefaultPluginVersionRequest( Plugin plugin, MavenSession session )
     {
-        this.groupId = plugin.getGroupId();
-        this.artifactId = plugin.getArtifactId();
-        this.repositoryRequest = new DefaultRepositoryRequest();
+        setGroupId( plugin.getGroupId() );
+        setArtifactId( plugin.getArtifactId() );
 
-        setCache( session.getRepositoryCache() );
-        setLocalRepository( session.getLocalRepository() );
-        setOffline( session.isOffline() );
-        setForceUpdate( session.getRequest().isUpdateSnapshots() );
-        setTransferListener( session.getRequest().getTransferListener() );
+        setRepositorySession( session.getRepositorySession() );
 
         MavenProject project = session.getCurrentProject();
         if ( project != null )
         {
-            setRemoteRepositories( project.getPluginArtifactRepositories() );
+            setRepositories( project.getRemotePluginRepositories() );
         }
     }
 
+    /**
+     * Creates a request for the specified plugin using the given repository session and plugin repositories.
+     * 
+     * @param plugin The plugin for which to resolve a version, must not be {@code null}.
+     * @param session The repository session to use, must not be {@code null}.
+     * @param repositories The plugin repositories to query, may be {@code null}.
+     */
+    public DefaultPluginVersionRequest( Plugin plugin, RepositorySystemSession session, List<RemoteRepository> repositories )
+    {
+        setGroupId( plugin.getGroupId() );
+        setArtifactId( plugin.getArtifactId() );
+
+        setRepositorySession( session );
+
+        setRepositories( repositories );
+    }
+
     public String getGroupId()
     {
         return groupId;
@@ -142,74 +130,33 @@ public class DefaultPluginVersionRequest
         return this;
     }
 
-    public RepositoryCache getCache()
+    public List<RemoteRepository> getRepositories()
     {
-        return repositoryRequest.getCache();
+        return repositories;
     }
 
-    public DefaultPluginVersionRequest setCache( RepositoryCache cache )
+    public DefaultPluginVersionRequest setRepositories( List<RemoteRepository> repositories )
     {
-        repositoryRequest.setCache( cache );
+        if ( repositories != null )
+        {
+            this.repositories = repositories;
+        }
+        else
+        {
+            this.repositories = Collections.emptyList();
+        }
 
         return this;
     }
 
-    public ArtifactRepository getLocalRepository()
+    public RepositorySystemSession getRepositorySession()
     {
-        return repositoryRequest.getLocalRepository();
+        return session;
     }
 
-    public DefaultPluginVersionRequest setLocalRepository( ArtifactRepository localRepository )
+    public DefaultPluginVersionRequest setRepositorySession( RepositorySystemSession session )
     {
-        repositoryRequest.setLocalRepository( localRepository );
-
-        return this;
-    }
-
-    public List<ArtifactRepository> getRemoteRepositories()
-    {
-        return repositoryRequest.getRemoteRepositories();
-    }
-
-    public DefaultPluginVersionRequest setRemoteRepositories( List<ArtifactRepository> remoteRepositories )
-    {
-        repositoryRequest.setRemoteRepositories( remoteRepositories );
-
-        return this;
-    }
-
-    public boolean isOffline()
-    {
-        return repositoryRequest.isOffline();
-    }
-
-    public DefaultPluginVersionRequest setOffline( boolean offline )
-    {
-        repositoryRequest.setOffline( offline );
-
-        return this;
-    }
-
-    public boolean isForceUpdate()
-    {
-        return repositoryRequest.isForceUpdate();
-    }
-
-    public DefaultPluginVersionRequest setForceUpdate( boolean forceUpdate )
-    {
-        repositoryRequest.setForceUpdate( forceUpdate );
-
-        return this;
-    }
-
-    public ArtifactTransferListener getTransferListener()
-    {
-        return repositoryRequest.getTransferListener();
-    }
-
-    public DefaultPluginVersionRequest setTransferListener( ArtifactTransferListener transferListener )
-    {
-        repositoryRequest.setTransferListener( transferListener );
+        this.session = session;
 
         return this;
     }

maven-core/src/main/java/org/apache/maven/plugin/version/PluginVersionRequest.java

@@ -21,11 +21,9 @@ package org.apache.maven.plugin.version;
 
 import java.util.List;
 
-import org.apache.maven.artifact.repository.ArtifactRepository;
-import org.apache.maven.artifact.repository.RepositoryCache;
-import org.apache.maven.artifact.repository.RepositoryRequest;
 import org.apache.maven.model.Model;
-import org.apache.maven.repository.ArtifactTransferListener;
+import org.sonatype.aether.RepositorySystemSession;
+import org.sonatype.aether.repository.RemoteRepository;
 
 /**
  * Collects settings required to resolve the version for a plugin.
@@ -34,7 +32,6 @@ import org.apache.maven.repository.ArtifactTransferListener;
  * @author Benjamin Bentmann
  */
 public interface PluginVersionRequest
-    extends RepositoryRequest
 {
 
     /**
@@ -84,80 +81,35 @@ public interface PluginVersionRequest
      */
     PluginVersionRequest setPom( Model pom );
 
-    /**
-     * Indicates whether network access to remote repositories has been disabled.
-     * 
-     * @return {@code true} if remote access has been disabled, {@code false} otherwise.
-     */
-    boolean isOffline();
-
-    /**
-     * Enables/disables network access to remote repositories.
-     * 
-     * @param offline {@code true} to disable remote access, {@code false} to allow network access.
-     * @return This request, never {@code null}.
-     */
-    PluginVersionRequest setOffline( boolean offline );
-
-    /**
-     * Gets the local repository to use.
-     * 
-     * @return The local repository to use or {@code null} if not set.
-     */
-    ArtifactRepository getLocalRepository();
-
-    /**
-     * Sets the local repository to use.
-     * 
-     * @param localRepository The local repository to use.
-     * @return This request, never {@code null}.
-     */
-    PluginVersionRequest setLocalRepository( ArtifactRepository localRepository );
-
     /**
      * Gets the remote repositories to use.
      * 
      * @return The remote repositories to use, never {@code null}.
      */
-    List<ArtifactRepository> getRemoteRepositories();
+    List<RemoteRepository> getRepositories();
 
     /**
      * Sets the remote repositories to use. <em>Note:</em> When creating a request from a project, be sure to use the
-     * plugin artifact repositories and not the regular artifact repositories.
+     * plugin repositories and not the regular project repositories.
      * 
-     * @param remoteRepositories The remote repositories to use.
+     * @param repositories The remote repositories to use.
      * @return This request, never {@code null}.
      */
-    PluginVersionRequest setRemoteRepositories( List<ArtifactRepository> remoteRepositories );
+    PluginVersionRequest setRepositories( List<RemoteRepository> repositories );
 
     /**
-     * Gets the repository cache to use.
+     * Gets the session to use for repository access.
      * 
-     * @return The repository cache to use or {@code null} if none.
+     * @return The repository session or {@code null} if not set.
      */
-    RepositoryCache getCache();
+    RepositorySystemSession getRepositorySession();
 
     /**
-     * Sets the repository cache to use.
+     * Sets the session to use for repository access.
      * 
-     * @param cache The repository cache to use, may be {@code null}.
+     * @param repositorySession The repository session to use.
      * @return This request, never {@code null}.
      */
-    PluginVersionRequest setCache( RepositoryCache cache );
-
-    /**
-     * Gets the listener to notify of transfer events.
-     * 
-     * @return The transfer listener or {@code null} if none.
-     */
-    ArtifactTransferListener getTransferListener();
-
-    /**
-     * Sets the listener to notify of transfer events.
-     * 
-     * @param transferListener The transfer listener to notify, may be {@code null}.
-     * @return This request, never {@code null}.
-     */
-    PluginVersionRequest setTransferListener( ArtifactTransferListener transferListener );
+    PluginVersionRequest setRepositorySession( RepositorySystemSession repositorySession );
 
 }