try (DirectoryStream<Path> stream = Files.newDirectoryStream(dir)) {
      return ImmutableList.copyOf(stream);
    } catch (DirectoryIteratorException e) {
      throw e.getCause();
    }
  }

  /**
   * Returns a {@link Traverser} instance for the file and directory tree. The returned traverser
   * starts from a {@link Path} and will return all files and directories it encounters.

              }
              throw new NoSuchFieldError("the Unsafe");
            }
          });
    } catch (PrivilegedActionException e) {
      throw new RuntimeException("Could not initialize intrinsics", e.getCause());
    }
  }

      // mayInterruptIfRunning is irrelevant.
      cancel(false);
      return;
    } catch (ExecutionException e) {
      // Set the cause of the exception as this future's exception.
      setException(e.getCause());
      return;
    } catch (Exception e) { // sneaky checked exception
      // Bug in inputFuture.get(). Propagate to the output Future so that its consumers don't hang.
      setException(e);
      return;

        assertArgumentNotNull("method", method);

        try {
            return (T) method.invoke(target, args);
        } catch (final InvocationTargetException ex) {
            final Throwable t = ex.getCause();
            if (t instanceof RuntimeException) {
                throw (RuntimeException) t;
            }
            if (t instanceof Error) {
                throw (Error) t;
            }

        final StringBuilder buf = new StringBuilder(100);
        Throwable current = t;
        while (current != null) {
            buf.append(current.getLocalizedMessage()).append(' ');
            current = current.getCause();
        }
        return buf.toString();
    }

    /**
     * Checks if a checkbox value represents an enabled state.
     * This method considers "on" and "true" (case-insensitive) as enabled values.

  private Object invokeGeneratorMethod(Method generator, Object... args) {
    try {
      return generator.invoke(this, args);
    } catch (InvocationTargetException e) {
      throwIfUnchecked(e.getCause());
      throw new RuntimeException(e.getCause());
    } catch (Exception e) {
      throwIfUnchecked(e);
      throw new RuntimeException(e);
    }
  }

  }

  @Test
  public void removalListener() {
    int[] stats = new int[4];

    RemovalListener<Integer, Integer> countingListener =
        notification -> {
          switch (notification.getCause()) {
            case EXPIRED:
              stats[0]++;
              break;
            case EXPLICIT:
              stats[1]++;
              break;
            case REPLACED:
              stats[2]++;

            // Some invalid queries may still be accepted by OpenSearch
        } catch (Exception e) {
            // Expected - invalid query syntax
            assertTrue(e instanceof SuggestIndexException || e.getCause() != null);
        }
    }

    @Test
    public void test_deleteAllOnEmptyIndex() throws Exception {
        SuggestDeleteResponse response = suggester.indexer().deleteAll();

    RemovalNotification<K, V> notification = listener.remove();
    assertThat(notification.getKey()).isSameInstanceAs(key);
    assertThat(notification.getValue()).isSameInstanceAs(value);
    assertThat(notification.getCause()).isEqualTo(cause);
  }

  // Segment core tests

  public void testNewEntry() {
    for (CacheBuilder<Object, Object> builder : allEntryTypeMakers()) {

    RemovalNotification<K, V> notification = listener.remove();
    assertThat(notification.getKey()).isSameInstanceAs(key);
    assertThat(notification.getValue()).isSameInstanceAs(value);
    assertThat(notification.getCause()).isEqualTo(cause);
  }

  // Segment core tests

  public void testNewEntry() {
    for (CacheBuilder<Object, Object> builder : allEntryTypeMakers()) {