plugin artifact and its dependency artifacts will be loaded in an isolated ClassRealm which is simply an extension of the standard URLClassLoader. Mercury would be responsible for resolving and retrieving the dependencies which would then be used to populate a ClassRealm where there would be a connection to the host applications ClassRealm as the parent but the search order would be child first, and the parent ClassRealm can optionally choose to limit the searching to particular classes. The application...

 * under the License.
 */
package org.apache.maven.configuration.internal;

import javax.inject.Named;
import javax.inject.Singleton;

import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.component.configurator.BasicComponentConfigurator;
import org.codehaus.plexus.component.configurator.ComponentConfigurationException;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.model.Plugin;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.classworlds.realm.NoSuchRealmException;
import org.codehaus.plexus.personality.plexus.lifecycle.phase.Disposable;
import org.eclipse.aether.RepositorySystemSession;

import org.apache.maven.api.services.DependencyResolverResult;
import org.apache.maven.api.services.PathScopeRegistry;
import org.apache.maven.api.xml.XmlNode;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.classrealm.ClassRealmManager;
import org.apache.maven.di.Injector;
import org.apache.maven.di.Key;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.execution.scope.internal.MojoExecutionScope;

import org.codehaus.plexus.DefaultPlexusContainer;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.classworlds.ClassWorld;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.RepositorySystemSession.CloseableSession;
import org.eclipse.aether.artifact.Artifact;

import org.codehaus.plexus.DefaultPlexusContainer;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.classworlds.ClassWorld;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.RepositorySystemSession.CloseableSession;
import org.eclipse.aether.artifact.Artifact;

~~ under the License.

 -----
 Maven plugins
 -----
 The Maven Team
 -----

Maven plugin execution isolation

 Maven2 takes advantage of Plexus' ability to execute a component using a
 ClassWorlds ClassRealm that is populated with the JAR containing the
 component in question and all of its dependencies. Using ClassWorlds
 notation for realms we have the following:

+-----+
      [plexus.core]
            ^

 * {{{/guides/mini/guide-maven-classloading.html}classloader hierarchy}} done by <<<ClassRealmManager>>> component
 ({{{./apidocs/org/apache/maven/classrealm/ClassRealmManager.html}javadoc}}),
 with its <<<DefaultClassRealmManager>>> implementation
 ({{{./xref/org/apache/maven/classrealm/DefaultClassRealmManager.html}source}}), using
 {{{https://codehaus-plexus.github.io/plexus-classworlds/}Plexus Classworlds}},

* Useful entry points

import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.component.repository.ComponentDescriptor;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.classrealm;

import java.io.File;

import org.eclipse.aether.artifact.Artifact;

/**
 */
class ArtifactClassRealmConstituent implements ClassRealmConstituent {

    private final Artifact artifact;