[MNG-7754] Improvement and extension of plugin validation (#1079)

This is general rework of current Maven 3.9.x line how it handles plugin and mojo validations.

Changes:
* added plugin validations for dependencies
* introduced pluginValidationManager that gathers violations
* manager creates a report at build end, with dense and non repeating data
* this is in spirit to lessen already too verbose logging, as current solution would report violations as many times plugin is used in reactor, and that can be many (ie. a plugin from parent for each module)

Example report of Maven 3.9.x build: https://gist.github.com/cstamas/b62fdcd53eaf316123cf183f5a24e6a5

---

https://issues.apache.org/jira/browse/MNG-7754

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

@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+
+/**
+ * Component collecting plugin validation issues and reporting them.
+ *
+ * @since 3.9.2
+ */
+public interface PluginValidationManager {
+    /**
+     * Reports plugin issues applicable to the plugin as a whole.
+     * <p>
+     * This method should be used in "early" phase of plugin execution, possibly even when plugin or mojo descriptor
+     * does not exist yet. In turn, this method will not record extra information like plugin occurrence or declaration
+     * location as those are not yet available.
+     */
+    void reportPluginValidationIssue(RepositorySystemSession session, Artifact pluginArtifact, String issue);
+
+    /**
+     * Reports plugin issues applicable to the plugin as a whole.
+     * <p>
+     * This method will record extra information as well, like plugin occurrence or declaration location.
+     */
+    void reportPluginValidationIssue(MavenSession mavenSession, MojoDescriptor mojoDescriptor, String issue);
+
+    /**
+     * Reports plugin Mojo issues applicable to the Mojo itself.
+     * <p>
+     * This method will record extra information as well, like plugin occurrence or declaration location.
+     */
+    void reportPluginMojoValidationIssue(
+            MavenSession mavenSession, MojoDescriptor mojoDescriptor, Class<?> mojoClass, String issue);
+}

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

@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Service responsible for validating plugin dependencies.
+ *
+ * @since 3.9.2
+ */
+abstract class AbstractMavenPluginDependenciesValidator implements MavenPluginDependenciesValidator {
+
+    protected final List<String> expectedProvidedScopeExclusions = Arrays.asList(
+            "org.apache.maven:maven-archiver", "org.apache.maven:maven-jxr", "org.apache.maven:plexus-utils");
+
+    protected final PluginValidationManager pluginValidationManager;
+
+    protected AbstractMavenPluginDependenciesValidator(PluginValidationManager pluginValidationManager) {
+        this.pluginValidationManager = requireNonNull(pluginValidationManager);
+    }
+
+    @Override
+    public void validate(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        if (mojoDescriptor.getPluginDescriptor() != null
+                && mojoDescriptor.getPluginDescriptor().getDependencies() != null) {
+            doValidate(mavenSession, mojoDescriptor);
+        }
+    }
+
+    protected abstract void doValidate(MavenSession mavenSession, MojoDescriptor mojoDescriptor);
+}

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

@@ -21,6 +21,8 @@ package org.apache.maven.plugin.internal;
 import java.util.Arrays;
 import java.util.List;
 
+import org.apache.maven.plugin.PluginValidationManager;
+
 /**
  * Common implementations for plugin parameters configuration validation that relies on Mojo descriptor (leaves out
  * core parameters by default).
@@ -48,6 +50,10 @@ abstract class AbstractMavenPluginDescriptorSourcedParametersValidator extends A
     private static final List<String> IGNORED_PROPERTY_PREFIX =
             Arrays.asList("mojo.", "pom.", "plugin.", "project.", "session.", "settings.");
 
+    protected AbstractMavenPluginDescriptorSourcedParametersValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
     @Override
     protected boolean isIgnoredProperty(String strValue) {
         if (!strValue.startsWith("${")) {

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

@@ -18,15 +18,15 @@
  */
 package org.apache.maven.plugin.internal;
 
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
-import org.apache.maven.shared.utils.logging.MessageBuilder;
-import org.apache.maven.shared.utils.logging.MessageUtils;
 import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
 import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
 import org.codehaus.plexus.configuration.PlexusConfiguration;
-import org.slf4j.Logger;
+
-import org.slf4j.LoggerFactory;
+import static java.util.Objects.requireNonNull;
 
 /**
  * Common implementations for plugin parameters configuration validation.
@@ -35,7 +35,11 @@ import org.slf4j.LoggerFactory;
  */
 abstract class AbstractMavenPluginParametersValidator implements MavenPluginConfigurationValidator {
 
-    protected final Logger logger = LoggerFactory.getLogger(getClass());
+    protected final PluginValidationManager pluginValidationManager;
+
+    protected AbstractMavenPluginParametersValidator(PluginValidationManager pluginValidationManager) {
+        this.pluginValidationManager = requireNonNull(pluginValidationManager);
+    }
 
     protected boolean isValueSet(PlexusConfiguration config, ExpressionEvaluator expressionEvaluator) {
         if (config == null) {
@@ -73,18 +77,18 @@ abstract class AbstractMavenPluginParametersValidator implements MavenPluginConf
 
     @Override
     public final void validate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator) {
-        if (!logger.isWarnEnabled()) {
+        doValidate(mavenSession, mojoDescriptor, mojoClass, pomConfiguration, expressionEvaluator);
-            return;
-        }
-
-        doValidate(mojoDescriptor, pomConfiguration, expressionEvaluator);
     }
 
     protected abstract void doValidate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator);
 
@@ -94,19 +98,19 @@ abstract class AbstractMavenPluginParametersValidator implements MavenPluginConf
 
     protected abstract String getParameterLogReason(Parameter parameter);
 
-    protected void logParameter(Parameter parameter) {
+    protected String formatParameter(Parameter parameter) {
-        MessageBuilder messageBuilder = MessageUtils.buffer()
+        StringBuilder stringBuilder = new StringBuilder()
-                .warning("Parameter '")
+                .append("Parameter '")
-                .warning(parameter.getName())
+                .append(parameter.getName())
-                .warning('\'');
+                .append('\'');
 
         if (parameter.getExpression() != null) {
             String userProperty = parameter.getExpression().replace("${", "'").replace('}', '\'');
-            messageBuilder.warning(" (user property ").warning(userProperty).warning(")");
+            stringBuilder.append(" (user property ").append(userProperty).append(")");
         }
 
-        messageBuilder.warning(" ").warning(getParameterLogReason(parameter));
+        stringBuilder.append(" ").append(getParameterLogReason(parameter));
 
-        logger.warn(messageBuilder.toString());
+        return stringBuilder.toString();
     }
 }

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

@@ -71,6 +71,7 @@ import org.apache.maven.plugin.PluginParameterExpressionEvaluator;
 import org.apache.maven.plugin.PluginParameterExpressionEvaluatorV4;
 import org.apache.maven.plugin.PluginRealmCache;
 import org.apache.maven.plugin.PluginResolutionException;
+import org.apache.maven.plugin.PluginValidationManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
@@ -99,6 +100,7 @@ import org.codehaus.plexus.component.repository.exception.ComponentLookupExcepti
 import org.codehaus.plexus.configuration.DefaultPlexusConfiguration;
 import org.codehaus.plexus.configuration.PlexusConfiguration;
 import org.codehaus.plexus.configuration.PlexusConfigurationException;
+import org.codehaus.plexus.personality.plexus.lifecycle.phase.Contextualizable;
 import org.codehaus.plexus.util.ReaderFactory;
 import org.codehaus.plexus.util.StringUtils;
 import org.eclipse.aether.RepositorySystemSession;
@@ -146,8 +148,9 @@ public class DefaultMavenPluginManager implements MavenPluginManager {
     private PluginArtifactsCache pluginArtifactsCache;
     private MavenPluginValidator pluginValidator;
     private List<MavenPluginConfigurationValidator> configurationValidators;
+    private List<MavenPluginDependenciesValidator> dependenciesValidators;
+    private PluginValidationManager pluginValidationManager;
     private List<MavenPluginPrerequisitesChecker> prerequisitesCheckers;
-
     private final ExtensionDescriptorBuilder extensionDescriptorBuilder = new ExtensionDescriptorBuilder();
     private final PluginDescriptorBuilder builder = new PluginDescriptorBuilder();
 
@@ -165,6 +168,8 @@ public class DefaultMavenPluginManager implements MavenPluginManager {
             PluginArtifactsCache pluginArtifactsCache,
             MavenPluginValidator pluginValidator,
             List<MavenPluginConfigurationValidator> configurationValidators,
+            List<MavenPluginDependenciesValidator> dependencyValidators,
+            PluginValidationManager pluginValidationManager,
             List<MavenPluginPrerequisitesChecker> prerequisitesCheckers) {
         this.container = container;
         this.classRealmManager = classRealmManager;
@@ -177,6 +182,8 @@ public class DefaultMavenPluginManager implements MavenPluginManager {
         this.pluginArtifactsCache = pluginArtifactsCache;
         this.pluginValidator = pluginValidator;
         this.configurationValidators = configurationValidators;
+        this.dependenciesValidators = dependencyValidators;
+        this.pluginValidationManager = pluginValidationManager;
         this.prerequisitesCheckers = prerequisitesCheckers;
     }
 
@@ -559,6 +566,18 @@ public class DefaultMavenPluginManager implements MavenPluginManager {
                 ((Mojo) mojo).setLog(new MojoLogWrapper(mojoLogger));
             }
 
+            if (mojo instanceof Contextualizable) {
+                pluginValidationManager.reportPluginMojoValidationIssue(
+                        session,
+                        mojoDescriptor,
+                        mojo.getClass(),
+                        "Implements `Contextualizable` interface from Plexus Container, which is EOL.");
+            }
+
+            for (MavenPluginDependenciesValidator validator : dependenciesValidators) {
+                validator.validate(session, mojoDescriptor);
+            }
+
             XmlNode dom = mojoExecution.getConfiguration() != null
                     ? mojoExecution.getConfiguration().getDom()
                     : null;
@@ -582,7 +601,7 @@ public class DefaultMavenPluginManager implements MavenPluginManager {
             }
 
             for (MavenPluginConfigurationValidator validator : configurationValidators) {
-                validator.validate(mojoDescriptor, pomConfiguration, expressionEvaluator);
+                validator.validate(session, mojoDescriptor, mojo.getClass(), pomConfiguration, expressionEvaluator);
             }
 
             populateMojoExecutionFields(

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

@@ -32,6 +32,7 @@ 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.plugin.PluginValidationManager;
 import org.codehaus.plexus.util.StringUtils;
 import org.eclipse.aether.DefaultRepositorySystemSession;
 import org.eclipse.aether.RepositorySystem;
@@ -77,9 +78,13 @@ public class DefaultPluginDependenciesResolver implements PluginDependenciesReso
 
     private final RepositorySystem repoSystem;
 
+    private final PluginValidationManager pluginValidationManager;
+
     @Inject
-    public DefaultPluginDependenciesResolver(RepositorySystem repoSystem) {
+    public DefaultPluginDependenciesResolver(
+            RepositorySystem repoSystem, PluginValidationManager pluginValidationManager) {
         this.repoSystem = repoSystem;
+        this.pluginValidationManager = pluginValidationManager;
     }
 
     private Artifact toArtifact(Plugin plugin, RepositorySystemSession session) {
@@ -107,6 +112,19 @@ public class DefaultPluginDependenciesResolver implements PluginDependenciesReso
             request.setTrace(trace);
             ArtifactDescriptorResult result = repoSystem.readArtifactDescriptor(pluginSession, request);
 
+            if (result.getDependencies() != null) {
+                for (org.eclipse.aether.graph.Dependency dependency : result.getDependencies()) {
+                    if ("org.apache.maven".equals(dependency.getArtifact().getGroupId())
+                            && "maven-compat".equals(dependency.getArtifact().getArtifactId())
+                            && !JavaScopes.TEST.equals(dependency.getScope())) {
+                        pluginValidationManager.reportPluginValidationIssue(
+                                session,
+                                pluginArtifact,
+                                "Plugin depends on the deprecated Maven 2.x compatibility layer, which may not be supported in Maven 4.x");
+                    }
+                }
+            }
+
             pluginArtifact = result.getArtifact();
 
             if (logger.isWarnEnabled()) {

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

@@ -0,0 +1,270 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.maven.AbstractMavenLifecycleParticipant;
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.model.InputLocation;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.apache.maven.plugin.descriptor.PluginDescriptor;
+import org.apache.maven.project.MavenProject;
+import org.eclipse.aether.RepositorySystemSession;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.util.ConfigUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Singleton
+@Named
+public final class DefaultPluginValidationManager extends AbstractMavenLifecycleParticipant
+        implements PluginValidationManager {
+
+    private static final String ISSUES_KEY = DefaultPluginValidationManager.class.getName() + ".issues";
+
+    private static final String MAVEN_PLUGIN_VALIDATION_KEY = "maven.plugin.validation";
+
+    private enum ValidationLevel {
+        DISABLED,
+        ENABLED,
+        VERBOSE
+    }
+
+    private final Logger logger = LoggerFactory.getLogger(getClass());
+
+    @Override
+    public void afterSessionEnd(MavenSession session) {
+        reportSessionCollectedValidationIssues(session);
+    }
+
+    private ValidationLevel validationLevel(RepositorySystemSession session) {
+        String level = ConfigUtils.getString(session, null, MAVEN_PLUGIN_VALIDATION_KEY);
+        if (level == null || level.isEmpty()) {
+            return ValidationLevel.ENABLED;
+        }
+        try {
+            return ValidationLevel.valueOf(level.toUpperCase(Locale.ENGLISH));
+        } catch (IllegalArgumentException e) {
+            logger.warn(
+                    "Invalid value specified for property {}: '{}'. Supported values are (case insensitive): {}",
+                    MAVEN_PLUGIN_VALIDATION_KEY,
+                    level,
+                    Arrays.toString(ValidationLevel.values()));
+            return ValidationLevel.ENABLED;
+        }
+    }
+
+    private String pluginKey(String groupId, String artifactId, String version) {
+        return groupId + ":" + artifactId + ":" + version;
+    }
+
+    private String pluginKey(MojoDescriptor mojoDescriptor) {
+        PluginDescriptor pd = mojoDescriptor.getPluginDescriptor();
+        return pluginKey(pd.getGroupId(), pd.getArtifactId(), pd.getVersion());
+    }
+
+    private String pluginKey(Artifact pluginArtifact) {
+        return pluginKey(pluginArtifact.getGroupId(), pluginArtifact.getArtifactId(), pluginArtifact.getVersion());
+    }
+
+    @Override
+    public void reportPluginValidationIssue(RepositorySystemSession session, Artifact pluginArtifact, String issue) {
+        String pluginKey = pluginKey(pluginArtifact);
+        PluginValidationIssues pluginIssues =
+                pluginIssues(session).computeIfAbsent(pluginKey, k -> new PluginValidationIssues());
+        pluginIssues.reportPluginIssue(null, null, issue);
+    }
+
+    @Override
+    public void reportPluginValidationIssue(MavenSession mavenSession, MojoDescriptor mojoDescriptor, String issue) {
+        String pluginKey = pluginKey(mojoDescriptor);
+        PluginValidationIssues pluginIssues = pluginIssues(mavenSession.getRepositorySession())
+                .computeIfAbsent(pluginKey, k -> new PluginValidationIssues());
+        pluginIssues.reportPluginIssue(
+                pluginDeclaration(mavenSession, mojoDescriptor), pluginOccurrence(mavenSession), issue);
+    }
+
+    @Override
+    public void reportPluginMojoValidationIssue(
+            MavenSession mavenSession, MojoDescriptor mojoDescriptor, Class<?> mojoClass, String issue) {
+        String pluginKey = pluginKey(mojoDescriptor);
+        PluginValidationIssues pluginIssues = pluginIssues(mavenSession.getRepositorySession())
+                .computeIfAbsent(pluginKey, k -> new PluginValidationIssues());
+        pluginIssues.reportPluginMojoIssue(
+                pluginDeclaration(mavenSession, mojoDescriptor),
+                pluginOccurrence(mavenSession),
+                mojoInfo(mojoDescriptor, mojoClass),
+                issue);
+    }
+
+    private void reportSessionCollectedValidationIssues(MavenSession mavenSession) {
+        ValidationLevel validationLevel = validationLevel(mavenSession.getRepositorySession());
+        ConcurrentHashMap<String, PluginValidationIssues> issuesMap = pluginIssues(mavenSession.getRepositorySession());
+        if (!issuesMap.isEmpty()) {
+
+            logger.warn("");
+            logger.warn("Plugin validation issues were detected in {} plugin(s)", issuesMap.size());
+            logger.warn("");
+            if (validationLevel == ValidationLevel.DISABLED || !logger.isWarnEnabled()) {
+                return;
+            }
+
+            for (Map.Entry<String, PluginValidationIssues> entry : issuesMap.entrySet()) {
+                logger.warn("Plugin {}", entry.getKey());
+                PluginValidationIssues issues = entry.getValue();
+                if (validationLevel == ValidationLevel.VERBOSE && !issues.pluginDeclarations.isEmpty()) {
+                    logger.warn("  Declared at location(s):");
+                    for (String pluginDeclaration : issues.pluginDeclarations) {
+                        logger.warn("   * {}", pluginDeclaration);
+                    }
+                }
+                if (validationLevel == ValidationLevel.VERBOSE && !issues.pluginOccurrences.isEmpty()) {
+                    logger.warn("  Used in module(s):");
+                    for (String pluginOccurrence : issues.pluginOccurrences) {
+                        logger.warn("   * {}", pluginOccurrence);
+                    }
+                }
+                if (!issues.pluginIssues.isEmpty()) {
+                    logger.warn("  Plugin issue(s):");
+                    for (String pluginIssue : issues.pluginIssues) {
+                        logger.warn("   * {}", pluginIssue);
+                    }
+                }
+                if (!issues.mojoIssues.isEmpty()) {
+                    logger.warn("  Mojo issue(s):");
+                    for (String mojoInfo : issues.mojoIssues.keySet()) {
+                        logger.warn("   * Mojo {}", mojoInfo);
+                        for (String mojoIssue : issues.mojoIssues.get(mojoInfo)) {
+                            logger.warn("     - {}", mojoIssue);
+                        }
+                    }
+                }
+                logger.warn("");
+            }
+            logger.warn("");
+            logger.warn(
+                    "To fix these issues, please upgrade above listed plugins, or, notify their maintainers about reported issues.");
+            logger.warn("");
+            logger.warn(
+                    "For more or less details, use 'maven.plugin.validation' property with one of the values (case insensitive): {}",
+                    Arrays.toString(ValidationLevel.values()));
+            logger.warn("");
+        }
+    }
+
+    private String pluginDeclaration(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        InputLocation inputLocation =
+                mojoDescriptor.getPluginDescriptor().getPlugin().getLocation("");
+        if (inputLocation != null && inputLocation.getSource() != null) {
+            StringBuilder stringBuilder = new StringBuilder();
+            stringBuilder.append(inputLocation.getSource().getModelId());
+            String location = inputLocation.getSource().getLocation();
+            if (location != null) {
+                if (location.contains("://")) {
+                    stringBuilder.append(" (").append(location).append(")");
+                } else {
+                    File rootBasedir = mavenSession.getTopLevelProject().getBasedir();
+                    File locationFile = new File(location);
+                    if (location.startsWith(rootBasedir.getPath())) {
+                        stringBuilder
+                                .append(" (")
+                                .append(rootBasedir.toPath().relativize(locationFile.toPath()))
+                                .append(")");
+                    } else {
+                        stringBuilder.append(" (").append(location).append(")");
+                    }
+                }
+            }
+            stringBuilder.append(" @ line ").append(inputLocation.getLineNumber());
+            return stringBuilder.toString();
+        } else {
+            return "unknown";
+        }
+    }
+
+    private String pluginOccurrence(MavenSession mavenSession) {
+        MavenProject prj = mavenSession.getCurrentProject();
+        String result = prj.getGroupId() + ":" + prj.getArtifactId() + ":" + prj.getVersion();
+        File currentPom = prj.getFile();
+        if (currentPom != null) {
+            File rootBasedir = mavenSession.getTopLevelProject().getBasedir();
+            result += " (" + rootBasedir.toPath().relativize(currentPom.toPath()) + ")";
+        }
+        return result;
+    }
+
+    private String mojoInfo(MojoDescriptor mojoDescriptor, Class<?> mojoClass) {
+        return mojoDescriptor.getFullGoalName() + " (" + mojoClass.getName() + ")";
+    }
+
+    @SuppressWarnings("unchecked")
+    private ConcurrentHashMap<String, PluginValidationIssues> pluginIssues(RepositorySystemSession session) {
+        return (ConcurrentHashMap<String, PluginValidationIssues>)
+                session.getData().computeIfAbsent(ISSUES_KEY, ConcurrentHashMap::new);
+    }
+
+    private static class PluginValidationIssues {
+        private final LinkedHashSet<String> pluginDeclarations;
+
+        private final LinkedHashSet<String> pluginOccurrences;
+
+        private final LinkedHashSet<String> pluginIssues;
+
+        private final LinkedHashMap<String, LinkedHashSet<String>> mojoIssues;
+
+        private PluginValidationIssues() {
+            this.pluginDeclarations = new LinkedHashSet<>();
+            this.pluginOccurrences = new LinkedHashSet<>();
+            this.pluginIssues = new LinkedHashSet<>();
+            this.mojoIssues = new LinkedHashMap<>();
+        }
+
+        private synchronized void reportPluginIssue(String pluginDeclaration, String pluginOccurrence, String issue) {
+            if (pluginDeclaration != null) {
+                pluginDeclarations.add(pluginDeclaration);
+            }
+            if (pluginOccurrence != null) {
+                pluginOccurrences.add(pluginOccurrence);
+            }
+            pluginIssues.add(issue);
+        }
+
+        private synchronized void reportPluginMojoIssue(
+                String pluginDeclaration, String pluginOccurrence, String mojoInfo, String issue) {
+            if (pluginDeclaration != null) {
+                pluginDeclarations.add(pluginDeclaration);
+            }
+            if (pluginOccurrence != null) {
+                pluginOccurrences.add(pluginOccurrence);
+            }
+            mojoIssues.computeIfAbsent(mojoInfo, k -> new LinkedHashSet<>()).add(issue);
+        }
+    }
+}

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

@@ -18,12 +18,15 @@
  */
 package org.apache.maven.plugin.internal;
 
+import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Singleton;
 
 import java.util.HashMap;
 import java.util.Objects;
 
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
 import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
@@ -40,7 +43,7 @@ class DeprecatedCoreExpressionValidator extends AbstractMavenPluginParametersVal
     private static final HashMap<String, String> DEPRECATED_CORE_PARAMETERS;
 
     private static final String ARTIFACT_REPOSITORY_REASON =
-            "Avoid use of ArtifactRepository type. If you need access to local repository, switch to '${repositorySystemSession}' expression and get LRM from it instead.";
+            "ArtifactRepository type is deprecated and its use in Mojos should be avoided.";
 
     static {
         HashMap<String, String> deprecatedCoreParameters = new HashMap<>();
@@ -49,21 +52,33 @@ class DeprecatedCoreExpressionValidator extends AbstractMavenPluginParametersVal
         DEPRECATED_CORE_PARAMETERS = deprecatedCoreParameters;
     }
 
+    @Inject
+    DeprecatedCoreExpressionValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
     @Override
     protected String getParameterLogReason(Parameter parameter) {
-        return "is deprecated core expression; " + DEPRECATED_CORE_PARAMETERS.get(parameter.getDefaultValue());
+        return "uses deprecated parameter expression '" + parameter.getDefaultValue() + "': "
+                + DEPRECATED_CORE_PARAMETERS.get(parameter.getDefaultValue());
     }
 
     @Override
     protected void doValidate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator) {
         if (mojoDescriptor.getParameters() == null) {
             return;
         }
 
-        mojoDescriptor.getParameters().stream().filter(this::isDeprecated).forEach(this::logParameter);
+        mojoDescriptor.getParameters().stream()
+                .filter(this::isDeprecated)
+                .map(this::formatParameter)
+                .forEach(m -> pluginValidationManager.reportPluginMojoValidationIssue(
+                        mavenSession, mojoDescriptor, mojoClass, m));
     }
 
     private boolean isDeprecated(Parameter parameter) {

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

@@ -18,9 +18,12 @@
  */
 package org.apache.maven.plugin.internal;
 
+import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Singleton;
 
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
 import org.apache.maven.shared.utils.logging.MessageUtils;
@@ -35,6 +38,12 @@ import org.codehaus.plexus.configuration.PlexusConfiguration;
 @Singleton
 @Named
 class DeprecatedPluginValidator extends AbstractMavenPluginDescriptorSourcedParametersValidator {
+
+    @Inject
+    DeprecatedPluginValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
     @Override
     protected String getParameterLogReason(Parameter parameter) {
         return "is deprecated: " + parameter.getDeprecated();
@@ -42,36 +51,46 @@ class DeprecatedPluginValidator extends AbstractMavenPluginDescriptorSourcedPara
 
     @Override
     protected void doValidate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator) {
         if (mojoDescriptor.getDeprecated() != null) {
-            logDeprecatedMojo(mojoDescriptor);
+            pluginValidationManager.reportPluginMojoValidationIssue(
+                    mavenSession, mojoDescriptor, mojoClass, logDeprecatedMojo(mojoDescriptor));
         }
 
+        if (mojoDescriptor.getParameters() != null) {
             mojoDescriptor.getParameters().stream()
                     .filter(parameter -> parameter.getDeprecated() != null)
                     .filter(Parameter::isEditable)
-                .forEach(parameter -> checkParameter(parameter, pomConfiguration, expressionEvaluator));
+                    .forEach(parameter -> checkParameter(
+                            mavenSession, mojoDescriptor, mojoClass, parameter, pomConfiguration, expressionEvaluator));
+        }
     }
 
     private void checkParameter(
-            Parameter parameter, PlexusConfiguration pomConfiguration, ExpressionEvaluator expressionEvaluator) {
+            MavenSession mavenSession,
+            MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
+            Parameter parameter,
+            PlexusConfiguration pomConfiguration,
+            ExpressionEvaluator expressionEvaluator) {
         PlexusConfiguration config = pomConfiguration.getChild(parameter.getName(), false);
 
         if (isValueSet(config, expressionEvaluator)) {
-            logParameter(parameter);
+            pluginValidationManager.reportPluginMojoValidationIssue(
+                    mavenSession, mojoDescriptor, mojoClass, formatParameter(parameter));
         }
     }
 
-    private void logDeprecatedMojo(MojoDescriptor mojoDescriptor) {
+    private String logDeprecatedMojo(MojoDescriptor mojoDescriptor) {
-        String message = MessageUtils.buffer()
+        return MessageUtils.buffer()
                 .warning("Goal '")
                 .warning(mojoDescriptor.getGoal())
                 .warning("' is deprecated: ")
                 .warning(mojoDescriptor.getDeprecated())
                 .toString();
-
-        logger.warn(message);
     }
 }

maven-core/src/main/java/org/apache/maven/plugin/internal/Maven2DependenciesValidator.java

@@ -0,0 +1,63 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.codehaus.plexus.component.repository.ComponentDependency;
+
+/**
+ * Detects Maven2 plugins.
+ *
+ * @since 3.9.2
+ */
+@Singleton
+@Named
+class Maven2DependenciesValidator extends AbstractMavenPluginDependenciesValidator {
+
+    @Inject
+    Maven2DependenciesValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
+    @Override
+    protected void doValidate(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        Set<String> maven2Versions = mojoDescriptor.getPluginDescriptor().getDependencies().stream()
+                .filter(d -> "org.apache.maven".equals(d.getGroupId()))
+                .filter(d -> !expectedProvidedScopeExclusions.contains(d.getGroupId() + ":" + d.getArtifactId()))
+                .map(ComponentDependency::getVersion)
+                .filter(v -> v.startsWith("2."))
+                .collect(Collectors.toSet());
+
+        if (!maven2Versions.isEmpty()) {
+            pluginValidationManager.reportPluginValidationIssue(
+                    mavenSession,
+                    mojoDescriptor,
+                    "Plugin is a Maven 2.x plugin, which will be not supported in Maven 4.x");
+        }
+    }
+}

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

@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+import org.codehaus.plexus.component.repository.ComponentDependency;
+
+/**
+ * Detects mixed Maven versions in plugins.
+ *
+ * @since 3.9.2
+ */
+@Singleton
+@Named
+class MavenMixedDependenciesValidator extends AbstractMavenPluginDependenciesValidator {
+
+    @Inject
+    MavenMixedDependenciesValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
+    @Override
+    protected void doValidate(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        Set<String> mavenVersions = mojoDescriptor.getPluginDescriptor().getDependencies().stream()
+                .filter(d -> "org.apache.maven".equals(d.getGroupId()))
+                .filter(d -> !expectedProvidedScopeExclusions.contains(d.getGroupId() + ":" + d.getArtifactId()))
+                .map(ComponentDependency::getVersion)
+                .collect(Collectors.toSet());
+
+        if (mavenVersions.size() > 1) {
+            pluginValidationManager.reportPluginValidationIssue(
+                    mavenSession, mojoDescriptor, "Plugin mixes multiple Maven versions: " + mavenVersions);
+        }
+    }
+}

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

@@ -18,6 +18,7 @@
  */
 package org.apache.maven.plugin.internal;
 
+import org.apache.maven.execution.MavenSession;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
 import org.codehaus.plexus.configuration.PlexusConfiguration;
@@ -29,10 +30,12 @@ import org.codehaus.plexus.configuration.PlexusConfiguration;
  */
 interface MavenPluginConfigurationValidator {
     /**
-     * Check mojo configuration.
+     * Checks mojo configuration issues.
      */
     void validate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator);
 }

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

@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+
+/**
+ * Service responsible for validating plugin dependencies.
+ *
+ * @since 3.9.2
+ */
+interface MavenPluginDependenciesValidator {
+    /**
+     * Checks mojo dependency issues.
+     */
+    void validate(MavenSession mavenSession, MojoDescriptor mojoDescriptor);
+}

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

@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+
+/**
+ * Detects Maven3 artifacts in bad scope in plugins.
+ *
+ * @since 3.9.2
+ */
+@Singleton
+@Named
+class MavenScopeDependenciesValidator extends AbstractMavenPluginDependenciesValidator {
+
+    @Inject
+    MavenScopeDependenciesValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
+    @Override
+    protected void doValidate(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        Set<String> mavenArtifacts = mojoDescriptor.getPluginDescriptor().getDependencies().stream()
+                .filter(d -> "org.apache.maven".equals(d.getGroupId()))
+                .filter(d -> !expectedProvidedScopeExclusions.contains(d.getGroupId() + ":" + d.getArtifactId()))
+                .filter(d -> d.getVersion().startsWith("3."))
+                .map(d -> d.getGroupId() + ":" + d.getArtifactId() + ":" + d.getVersion())
+                .collect(Collectors.toSet());
+
+        if (!mavenArtifacts.isEmpty()) {
+            pluginValidationManager.reportPluginValidationIssue(
+                    mavenSession,
+                    mojoDescriptor,
+                    "Plugin should declare these Maven artifacts in `provided` scope: " + mavenArtifacts);
+        }
+    }
+}

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

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+package org.apache.maven.plugin.internal;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
+import org.apache.maven.plugin.descriptor.MojoDescriptor;
+
+/**
+ * Detects Plexus Container Default in plugins.
+ *
+ * @since 3.9.2
+ */
+@Singleton
+@Named
+class PlexusContainerDefaultDependenciesValidator extends AbstractMavenPluginDependenciesValidator {
+
+    @Inject
+    PlexusContainerDefaultDependenciesValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
+    protected void doValidate(MavenSession mavenSession, MojoDescriptor mojoDescriptor) {
+        boolean pcdPresent = mojoDescriptor.getPluginDescriptor().getDependencies().stream()
+                .filter(d -> "org.codehaus.plexus".equals(d.getGroupId()))
+                .anyMatch(d -> "plexus-container-default".equals(d.getArtifactId()));
+
+        if (pcdPresent) {
+            pluginValidationManager.reportPluginValidationIssue(
+                    mavenSession, mojoDescriptor, "Plugin depends on plexus-container-default, which is EOL");
+        }
+    }
+}

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

@@ -18,9 +18,12 @@
  */
 package org.apache.maven.plugin.internal;
 
+import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Singleton;
 
+import org.apache.maven.execution.MavenSession;
+import org.apache.maven.plugin.PluginValidationManager;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.Parameter;
 import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
@@ -34,6 +37,12 @@ import org.codehaus.plexus.configuration.PlexusConfiguration;
 @Named
 @Singleton
 class ReadOnlyPluginParametersValidator extends AbstractMavenPluginDescriptorSourcedParametersValidator {
+
+    @Inject
+    ReadOnlyPluginParametersValidator(PluginValidationManager pluginValidationManager) {
+        super(pluginValidationManager);
+    }
+
     @Override
     protected String getParameterLogReason(Parameter parameter) {
         return "is read-only, must not be used in configuration";
@@ -41,7 +50,9 @@ class ReadOnlyPluginParametersValidator extends AbstractMavenPluginDescriptorSou
 
     @Override
     protected void doValidate(
+            MavenSession mavenSession,
             MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
             PlexusConfiguration pomConfiguration,
             ExpressionEvaluator expressionEvaluator) {
         if (mojoDescriptor.getParameters() == null) {
@@ -50,15 +61,22 @@ class ReadOnlyPluginParametersValidator extends AbstractMavenPluginDescriptorSou
 
         mojoDescriptor.getParameters().stream()
                 .filter(parameter -> !parameter.isEditable())
-                .forEach(parameter -> checkParameter(parameter, pomConfiguration, expressionEvaluator));
+                .forEach(parameter -> checkParameter(
+                        mavenSession, mojoDescriptor, mojoClass, parameter, pomConfiguration, expressionEvaluator));
     }
 
     private void checkParameter(
-            Parameter parameter, PlexusConfiguration pomConfiguration, ExpressionEvaluator expressionEvaluator) {
+            MavenSession mavenSession,
+            MojoDescriptor mojoDescriptor,
+            Class<?> mojoClass,
+            Parameter parameter,
+            PlexusConfiguration pomConfiguration,
+            ExpressionEvaluator expressionEvaluator) {
         PlexusConfiguration config = pomConfiguration.getChild(parameter.getName(), false);
 
         if (isValueSet(config, expressionEvaluator)) {
-            logParameter(parameter);
+            pluginValidationManager.reportPluginMojoValidationIssue(
+                    mavenSession, mojoDescriptor, mojoClass, formatParameter(parameter));
         }
     }
 }