The spliterator underlying a stream constructed from Arrays.asList() should have the IMMUTABLE characteristic, since it cannot be structurally modified after creation.

From: Paul Sandoz:

The Arrays.ArrayList spliterator should be:

  @Override
  public Spliterator<E> spliterator() {
      return Spliterators.spliterator(a, Spliterator.ORDERED | Spliterator.IMMUTABLE);
  }