o Improved error reporting

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@750906 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -162,7 +162,8 @@ public class DefaultArtifactResolver
             {
                 if ( !isOnline() )
                 {
-                    throw new ArtifactNotFoundException( "The repository system is offline.", artifact );
+                    throw new ArtifactResolutionException( "The repository system is offline and the artifact "
+                        + artifact + " is not available in the local repository.", artifact );
                 }
 
                 try

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

@@ -695,7 +695,17 @@ public class DefaultMavenProjectBuilder
 
         Artifact artifactParent = repositorySystem.createParentArtifact( domainModel.getParentGroupId(), domainModel.getParentArtifactId(), domainModel.getParentVersion() );
 
-        ArtifactResolutionResult result = repositorySystem.resolve( new ArtifactResolutionRequest( artifactParent, localRepository, remoteRepositories ) );
+        ArtifactResolutionRequest request = new ArtifactResolutionRequest( artifactParent, localRepository, remoteRepositories );
+        ArtifactResolutionResult result = repositorySystem.resolve( request );
+        try
+        {
+            resolutionErrorHandler.throwErrors( request, result );
+        }
+        catch ( ArtifactResolutionException e )
+        {
+            throw (IOException) new IOException( "The parent POM " + artifactParent
+                + " could not be retrieved from any repository" ).initCause( e );
+        }
 
         PomClassicDomainModel parentDomainModel = new PomClassicDomainModel( artifactParent.getFile() );