final Throwable[] causes = ((MultipleCrawlingAccessException) e).getCauses();
                if (causes.length > 0) {
                    e = causes[causes.length - 1];
                }
            }

            String errorName;
            final Throwable cause = e.getCause();
            if (cause != null) {
                errorName = cause.getClass().getCanonicalName();

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

    public static boolean isCheckboxEnabled(final String value) {
        if (value == null) {
            return false;
        }

            } catch (final ClientAbortException e) {
                logger.debug("Client aborts this request.", e);
            }
        } catch (final Exception e) {
            if (!(e.getCause() instanceof ClientAbortException)) {
                throw new WebApiException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e);
            }
            logger.debug("Client aborts this request.", e);
        }
    }

                throw responseManager.new400("Unsupported request type.");
            }
            return actionResponse;
        } catch (final SsoMessageException e) {
            if (e.getCause() == null) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Metadata response.", e);
                }
                saveInfo(e.getMessageCode());
            } else {

                } catch (final DataStoreCrawlingException e) {
                    crawlerStatsHelper.record(keyObj, StatsAction.ACCESS_EXCEPTION);
                    final Throwable cause = e.getCause();
                    if (cause instanceof ChildUrlsException) {
                        ((ChildUrlsException) cause).getChildUrlList().stream().map(RequestData::getUrl).forEach(s -> {

        }
    }

    protected String detailedMessage(final Throwable t) {
        if (t == null) {
            return "Unknown";
        }
        Throwable target = t;
        if (target.getCause() == null) {
            return target.getClass().getSimpleName() + "[" + target.getMessage() + "]";
        }
        final StringBuilder sb = new StringBuilder();
        while (target != null) {

            try (final InputStream is = new BufferedInputStream(responseData.getResponseBody())) {
                out.write(is);
            } catch (final IOException e) {
                if (!(e.getCause() instanceof ClientAbortException)) {
                    throw new FessSystemException("Failed to write a content. configId: " + configId + ", url: " + url, e);
                }
            } finally {

            }
            return consumer.test(configId, url);
        } catch (final ThumbnailGenerationException e) {
            if (e.getCause() == null) {
                logger.debug(e.getMessage());
            } else {
                logger.warn("Failed to process {}", id, e);
            }
        } catch (final Exception e) {