@VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override
    Set<E> delegate() {

  @VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override
    Set<E> delegate() {

    private Map<String, Object> context;

    private ClassRealm classRealm;

    private DependencyFilter extensionDependencyFilter;

    private final Set<String> lifecyclePhases = Collections.synchronizedSet(new LinkedHashSet<>());

    public MavenProject() {
        Model model = new Model();

        model.setGroupId(EMPTY_PROJECT_GROUP_ID);
        model.setArtifactId(EMPTY_PROJECT_ARTIFACT_ID);