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diff --git a/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuildingHelper.java b/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/project/DefaultProjectBuildingHelper.java
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@@ -0,0 +1,295 @@
+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.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.maven.RepositoryUtils;
+import org.apache.maven.artifact.Artifact;
+import org.apache.maven.artifact.InvalidRepositoryException;
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.classrealm.ClassRealmManager;
+import org.apache.maven.model.Build;
+import org.apache.maven.model.Extension;
+import org.apache.maven.model.Model;
+import org.apache.maven.model.Plugin;
+import org.apache.maven.model.Repository;
+import org.apache.maven.plugin.ExtensionRealmCache;
+import org.apache.maven.plugin.MavenPluginManager;
+import org.apache.maven.plugin.PluginManagerException;
+import org.apache.maven.plugin.PluginResolutionException;
+import org.apache.maven.plugin.version.PluginVersionResolutionException;
+import org.apache.maven.repository.RepositorySystem;
+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.codehaus.plexus.logging.Logger;
+import org.eclipse.aether.graph.DependencyFilter;
+import org.eclipse.aether.util.filter.ExclusionsDependencyFilter;
+
+/**
+ * Assists the project builder. <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
+ */
+@Component( role = ProjectBuildingHelper.class )
+public class DefaultProjectBuildingHelper
+ implements ProjectBuildingHelper
+{
+
+ @Requirement
+ private Logger logger;
+
+ @Requirement
+ private PlexusContainer container;
+
+ @Requirement
+ private ClassRealmManager classRealmManager;
+
+ @Requirement
+ private ProjectRealmCache projectRealmCache;
+
+ @Requirement
+ private RepositorySystem repositorySystem;
+
+ @Requirement
+ private MavenPluginManager pluginManager;
+
+ public List<ArtifactRepository> createArtifactRepositories( List<Repository> pomRepositories,
+ List<ArtifactRepository> externalRepositories,
+ ProjectBuildingRequest request )
+ throws InvalidRepositoryException
+ {
+ List<ArtifactRepository> internalRepositories = new ArrayList<ArtifactRepository>();
+
+ for ( Repository repository : pomRepositories )
+ {
+ internalRepositories.add( repositorySystem.buildArtifactRepository( repository ) );
+ }
+
+ repositorySystem.injectMirror( request.getRepositorySession(), internalRepositories );
+
+ repositorySystem.injectProxy( request.getRepositorySession(), internalRepositories );
+
+ repositorySystem.injectAuthentication( request.getRepositorySession(), internalRepositories );
+
+ List<ArtifactRepository> dominantRepositories;
+ List<ArtifactRepository> recessiveRepositories;
+
+ if ( ProjectBuildingRequest.RepositoryMerging.REQUEST_DOMINANT.equals( request.getRepositoryMerging() ) )
+ {
+ dominantRepositories = externalRepositories;
+ recessiveRepositories = internalRepositories;
+ }
+ else
+ {
+ dominantRepositories = internalRepositories;
+ recessiveRepositories = externalRepositories;
+ }
+
+ List<ArtifactRepository> artifactRepositories = new ArrayList<ArtifactRepository>();
+ Collection<String> repoIds = new HashSet<String>();
+
+ if ( dominantRepositories != null )
+ {
+ for ( ArtifactRepository repository : dominantRepositories )
+ {
+ repoIds.add( repository.getId() );
+ artifactRepositories.add( repository );
+ }
+ }
+
+ if ( recessiveRepositories != null )
+ {
+ for ( ArtifactRepository repository : recessiveRepositories )
+ {
+ if ( repoIds.add( repository.getId() ) )
+ {
+ artifactRepositories.add( repository );
+ }
+ }
+ }
+
+ artifactRepositories = repositorySystem.getEffectiveRepositories( artifactRepositories );
+
+ return artifactRepositories;
+ }
+
+ public synchronized ProjectRealmCache.CacheRecord createProjectRealm( MavenProject project, Model model,
+ ProjectBuildingRequest request )
+ throws PluginResolutionException, PluginVersionResolutionException, PluginManagerException
+ {
+ ClassRealm projectRealm;
+
+ List<Plugin> extensionPlugins = new ArrayList<Plugin>();
+
+ Build build = model.getBuild();
+
+ if ( build != null )
+ {
+ for ( Extension extension : build.getExtensions() )
+ {
+ Plugin plugin = new Plugin();
+ plugin.setGroupId( extension.getGroupId() );
+ plugin.setArtifactId( extension.getArtifactId() );
+ plugin.setVersion( extension.getVersion() );
+ extensionPlugins.add( plugin );
+ }
+
+ for ( Plugin plugin : build.getPlugins() )
+ {
+ if ( plugin.isExtensions() )
+ {
+ extensionPlugins.add( plugin );
+ }
+ }
+ }
+
+ if ( extensionPlugins.isEmpty() )
+ {
+ if ( logger.isDebugEnabled() )
+ {
+ logger.debug( "Extension realms for project " + model.getId() + ": (none)" );
+ }
+
+ return new ProjectRealmCache.CacheRecord( null, null );
+ }
+
+ List<ClassRealm> extensionRealms = new ArrayList<ClassRealm>();
+
+ Map<ClassRealm, List<String>> exportedPackages = new HashMap<ClassRealm, List<String>>();
+
+ Map<ClassRealm, List<String>> exportedArtifacts = new HashMap<ClassRealm, List<String>>();
+
+ List<Artifact> publicArtifacts = new ArrayList<Artifact>();
+
+ for ( Plugin plugin : extensionPlugins )
+ {
+ ExtensionRealmCache.CacheRecord recordRealm =
+ pluginManager.setupExtensionsRealm( project, plugin, request.getRepositorySession() );
+
+ final ClassRealm extensionRealm = recordRealm.realm;
+ final ExtensionDescriptor extensionDescriptor = recordRealm.desciptor;
+ final List<Artifact> artifacts = recordRealm.artifacts;
+
+ extensionRealms.add( extensionRealm );
+ if ( extensionDescriptor != null )
+ {
+ exportedPackages.put( extensionRealm, extensionDescriptor.getExportedPackages() );
+ exportedArtifacts.put( extensionRealm, extensionDescriptor.getExportedArtifacts() );
+ }
+
+ if ( !plugin.isExtensions() && artifacts.size() == 2 && artifacts.get( 0 ).getFile() != null
+ && "plexus-utils".equals( artifacts.get( 1 ).getArtifactId() ) )
+ {
+ /*
+ * This is purely for backward-compat with 2.x where <extensions> consisting of a single artifact where
+ * loaded into the core and hence available to plugins, in contrast to bigger extensions that were
+ * loaded into a dedicated realm which is invisible to plugins (MNG-2749).
+ */
+ publicArtifacts.add( artifacts.get( 0 ) );
+ }
+ }
+
+ if ( logger.isDebugEnabled() )
+ {
+ logger.debug( "Extension realms for project " + model.getId() + ": " + extensionRealms );
+ }
+
+ ProjectRealmCache.Key projectRealmKey = projectRealmCache.createKey( extensionRealms );
+
+ ProjectRealmCache.CacheRecord record = projectRealmCache.get( projectRealmKey );
+
+ if ( record == null )
+ {
+ projectRealm = classRealmManager.createProjectRealm( model, toAetherArtifacts( publicArtifacts ) );
+
+ Set<String> exclusions = new LinkedHashSet<String>();
+
+ for ( ClassRealm extensionRealm : extensionRealms )
+ {
+ List<String> excludes = exportedArtifacts.get( extensionRealm );
+
+ if ( excludes != null )
+ {
+ exclusions.addAll( excludes );
+ }
+
+ List<String> exports = exportedPackages.get( extensionRealm );
+
+ if ( exports == null || exports.isEmpty() )
+ {
+ /*
+ * Most existing extensions don't define exported packages, i.e. no classes are to be exposed to
+ * plugins, yet the components provided by the extension (e.g. artifact handlers) must be
+ * accessible, i.e. we still must import the extension realm into the project realm.
+ */
+ exports = Arrays.asList( extensionRealm.getId() );
+ }
+
+ for ( String export : exports )
+ {
+ projectRealm.importFrom( extensionRealm, export );
+ }
+ }
+
+ DependencyFilter extensionArtifactFilter = null;
+ if ( !exclusions.isEmpty() )
+ {
+ extensionArtifactFilter = new ExclusionsDependencyFilter( exclusions );
+ }
+
+ record = projectRealmCache.put( projectRealmKey, projectRealm, extensionArtifactFilter );
+ }
+
+ projectRealmCache.register( project, projectRealmKey, record );
+
+ return record;
+ }
+
+ public void selectProjectRealm( MavenProject project )
+ {
+ ClassLoader projectRealm = project.getClassRealm();
+
+ if ( projectRealm == null )
+ {
+ projectRealm = classRealmManager.getCoreRealm();
+ }
+
+ Thread.currentThread().setContextClassLoader( projectRealm );
+ }
+
+ private List<org.eclipse.aether.artifact.Artifact> toAetherArtifacts( final List<Artifact> pluginArtifacts )
+ {
+ return new ArrayList<org.eclipse.aether.artifact.Artifact>( RepositoryUtils.toArtifacts( pluginArtifacts ) );
+ }
+
+}