// requireNonNull is safe because ExampleStackTrace sets a non-null message.
      StringBuilder message = new StringBuilder(requireNonNull(super.getMessage()));
      for (Throwable t = conflictingStackTrace; t != null; t = t.getCause()) {
        message.append(", ").append(t.getMessage());
      }
      return message.toString();
    }
  }

  /**

                  started.countDown();
                  try {
                    return method.invoke(delegate, args);
                  } catch (InvocationTargetException e) {
                    throw e.getCause();
                  } finally {
                    awaitUninterruptibly(canReturn);
                    returned.countDown();
                  }
                }
              });

            client.execute(RequestDataBuilder.newRequestData().get().url(url).build());
            fail();
        } catch (final MultipleCrawlingAccessException e) {
            // ok
            final Throwable[] causes = e.getCauses();
            assertEquals(5, causes.length);
        }
        assertEquals(1, testListener.startCount);
        assertEquals(5, testListener.requestCount);
        assertEquals(5, testListener.exceptionCount);

            count++;
        }
    }

    /**
     * Returns the array of Throwables that caused this exception.
     * @return The array of Throwables.
     */
    public Throwable[] getCauses() {
        return throwables;
    }