}

    @Override
    public void buildExtensionsAssembled(ModelBuildingEvent event) {
        Model model = new Model(event.model());

        try {
            pluginRepositories = projectBuildingHelper.createArtifactRepositories(
                    model.getPluginRepositories(), pluginRepositories, projectBuildingRequest);
        } catch (Exception e) {
            event.problems()
                    .add(

/**
 * A stub implementation to bypass artifact resolution from repositories.
 *
 */
public class EmptyProjectBuildingHelper implements ProjectBuildingHelper {

    public List<ArtifactRepository> createArtifactRepositories(
            List<Repository> pomRepositories,
            List<ArtifactRepository> externalRepositories,
            ProjectBuildingRequest request) {
        if (externalRepositories != null) {

     *            {@code null}.
     * @return The effective artifact repositories, never {@code null}.
     * @throws InvalidRepositoryException
     */
    List<ArtifactRepository> createArtifactRepositories(
            List<Repository> pomRepositories,
            List<ArtifactRepository> externalRepositories,
            ProjectBuildingRequest request)
            throws InvalidRepositoryException;

    /**

        this.projectRealmCache = projectRealmCache;
        this.repositorySystem = repositorySystem;
        this.pluginManager = pluginManager;
    }

    public List<ArtifactRepository> createArtifactRepositories(
            List<Repository> pomRepositories,
            List<ArtifactRepository> externalRepositories,
            ProjectBuildingRequest request)
            throws InvalidRepositoryException {