</plugin>
      <plugin>
        <artifactId>maven-source-plugin</artifactId>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>animal-sniffer-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <extensions>true</extensions>
        <groupId>org.apache.felix</groupId>
        <artifactId>maven-bundle-plugin</artifactId>
        <version>6.0.0</version>

        assertInstanceOf(Collection.class, value);

        @SuppressWarnings("unchecked")
        Collection<Artifact> artifacts = (Collection<Artifact>) value;

        assertEquals(1, artifacts.size());

        Artifact result = artifacts.iterator().next();

        assertEquals("org.myco.plugins", result.getGroupId());
    }

    @Test

 the Maven Repository Metadata file contains 3 different sets of metadata:

 [[1]] in a "groupId" directory: a "groupId" directory may contain Maven plugins artifacts, which are described in metadata's <<<plugins>>> element,

 [[2]] in a "groupId/artifactId" directory: metadata describes <<<groupId>>>, <<<artifactId>>> and <<<versioning>>> element that

        pluginManager.getPluginRealm(session, pluginDescriptor);
        List<Artifact> artifacts = pluginDescriptor.getArtifacts();

        for (Artifact a : artifacts) {
            if (a.getGroupId().equals("org.apache.maven.its.mng3586")
                    && a.getArtifactId().equals("tools")) {

        }
        log.debug("Populating class realm {}", realm.getId());
        for (Artifact artifact : artifacts) {
            String id = artifact.getGroupId() + ":" + artifact.getArtifactId();
            if (providedArtifacts.contains(id)) {
                log.debug("  Excluded {}", id);
            } else {
                File file = artifact.getFile();
                log.debug("  Included {} located at {}", id, file);

        MavenProject project = createProject("group", "artifact", "1.0");

        Build build = project.getModel().getBuild();

        Plugin plugin = createPlugin("other.group", "other-artifact", "1.0");

        Dependency dep = createDependency("group", "artifact", "1.0");

        plugin.addDependency(dep);

        build.addPlugin(plugin);

import java.io.File;
import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.InvalidRepositoryException;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;

        }
        log.debug("Populating class realm {}", realm.getId());
        for (Artifact artifact : artifacts) {
            String id = artifact.getGroupId() + ":" + artifact.getArtifactId();
            if (providedArtifacts.contains(id)) {
                log.debug("  Excluded {}", id);
            } else {
                Path file = artifact.getPath();
                log.debug("  Included {} located at {}", id, file);

        Key(RepositorySystemSession session, VersionRequest request) {
            Artifact artifact = request.getArtifact();
            groupId = artifact.getGroupId();
            artifactId = artifact.getArtifactId();
            classifier = artifact.getClassifier();
            extension = artifact.getExtension();
            version = artifact.getVersion();
            localRepo = session.getLocalRepository().getBasePath();

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example.group</groupId>
  <artifactId>testinvalidpom</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>the.groupId.Of.This.Plugin</groupId>
          <artifactId/>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>