*
     * @throws SecurityException if we don't have the appropriate privileges
     */
    @CheckForNull
    Class<?> loadFinalizer();
  }

  /**
   * Tries to load Finalizer from the system class loader. If Finalizer is in the system class path,
   * we needn't create a separate loader.
   */
  static class SystemLoader implements FinalizerLoader {

     *
     * @throws SecurityException if we don't have the appropriate privileges
     */
    @CheckForNull
    Class<?> loadFinalizer();
  }

  /**
   * Tries to load Finalizer from the system class loader. If Finalizer is in the system class path,
   * we needn't create a separate loader.
   */
  static class SystemLoader implements FinalizerLoader {

  /**
   * This is a less carefully-controlled version of {@link #testRemovalNotification_clear} - this is
   * a black-box test that tries to create lots of different thread-interleavings, and asserts that
   * each computation is affected by a call to {@code clear()} (and therefore gets passed to the