// Keep a second pointer that slowly walks the causal chain. If the fast pointer ever catches
    // the slower pointer, then there's a loop.
    Throwable slowPointer = throwable;
    boolean advanceSlowPointer = false;

    Throwable cause;
    while ((cause = throwable.getCause()) != null) {
      throwable = cause;

      if (throwable == slowPointer) {

   */
  @CanIgnoreReturnValue
  @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
  public boolean cancel(boolean mayInterruptIfRunning) {
    logger.get().log(FINER, "cancelling {0}", this);
    boolean cancelled = future.cancel(mayInterruptIfRunning);
    if (cancelled) {
      close();
    }
    return cancelled;
  }

  private void close() {

            }
        }

        private static class RequestHandlerImpl extends AbstractHandler {
            public static final String MULTIPART_FORMDATA_TYPE = "multipart/form-data";

            public static boolean isMultipartRequest(HttpServletRequest request) {
                return request.getContentType() != null && request.getContentType().startsWith(MULTIPART_FORMDATA_TYPE);
            }

            @Override

    protected Client client;

    protected String address;

    protected List<OnConnectListener> onConnectListenerList = new ArrayList<>();

    private volatile boolean connected;

    protected Scroll scrollForDelete = new Scroll(TimeValue.timeValueMinutes(1));

    protected int sizeForDelete = 10;

    protected long retryInterval = 3 * 1000L;

      Object instance = instantiate(cls);
      if (instance != null) {
        nullPointerTester.testInstanceMethods(instance, visibility);
      }
    }
  }

  private boolean hasInstanceMethodToTestNulls(Class<?> c, Visibility visibility) {
    for (Method method : nullPointerTester.getInstanceMethodsToTest(c, visibility)) {
      for (Parameter param : Invokable.from(method).getParameters()) {

    public int size() {
      return end - start;
    }

    @Override
    public boolean isEmpty() {
      return false;
    }

    @Override
    public Character get(int index) {
      checkElementIndex(index, size());
      return array[start + index];
    }

    @Override
    public boolean contains(@CheckForNull Object target) {
      // Overridden to prevent a ton of boxing

  }

  @Override
  public int lastIndexOf(@Nullable Object object) {
    return (object == null) ? -1 : Lists.lastIndexOfImpl(this, object);
  }

  public final boolean addAll(int index, Collection<? extends E> newElements) {
    throw new UnsupportedOperationException();
  }

  public final E set(int index, E element) {
    throw new UnsupportedOperationException();
  }

        }
    }

    public void test_doGet_accessTimeoutTarget() {
        FtpClient client = new FtpClient() {
            @Override
            protected ResponseData getResponseData(final String uri, final boolean includeContent) {
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                    throw new CrawlingAccessException(e);
                }

    assertEquals("backward", nullsAreHandled.reverse().convert("foo"));
    assertEquals(null, nullsAreHandled.reverse().convert(null));
  }

  private static Converter<String, String> sillyConverter(final boolean handleNullAutomatically) {
    return new Converter<String, String>(handleNullAutomatically) {
      @Override
      protected String doForward(String string) {
        return "forward";
      }

        protected int numOfThreads = 1;

        @Option(name = "-c", aliases = "--cleanup", usage = "Clean-Up mode")
        protected boolean cleanup;

        protected Options() {
            // nothing
        }

        @Override
        public String toString() {