return OptionalThing.of(asJson(createFailureBean(Status.BAD_REQUEST, createMessage(resource, cause))));
    }

    @Override
    public OptionalThing<ApiResponse> handleServerException(final ApiFailureResource resource, final Throwable cause) {
        return OptionalThing.of(asJson(createFailureBean(Status.SYSTEM_ERROR, createMessage(resource, cause))));
    }

public class ThemeException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public ThemeException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public ThemeException(final String message) {
        super(message);
    }

    private final transient VaMessenger<FessMessages> messageCode;

    public InvalidQueryException(final VaMessenger<FessMessages> messageCode, final String message, final Throwable cause) {
        super(message, cause);
        this.messageCode = messageCode;
    }

    public InvalidQueryException(final VaMessenger<FessMessages> messageCode, final String message) {
        super(message);

                    e = causes[causes.length - 1];
                }
            }

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

public class QueryParseException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public QueryParseException(final ParseException cause) {
        super(cause);
    }

public class DictionaryException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public DictionaryException(final String message, final Throwable cause) {
        super(message, cause);
    }

    public DictionaryException(final String message) {
        super(message);
    }

public class ThumbnailGenerationException extends FessSystemException {

    private static final long serialVersionUID = 1L;

    public ThumbnailGenerationException(final String message, final Exception cause) {
        super(message, cause);
    }

    public ThumbnailGenerationException(final String message) {
        super(message, false, false);
    }

      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.

                    crawlerStatsHelper.record(keyObj, StatsAction.ACCESS_EXCEPTION);
                    final Throwable cause = e.getCause();
                    if (cause instanceof ChildUrlsException) {
                        ((ChildUrlsException) cause).getChildUrlList().stream().map(RequestData::getUrl).forEach(s -> {
                            if (!processedUrls.contains(s) && !urlQueue.contains(s)) {

                cause = e;
            }
            if (cause instanceof OpenSearchStatusException) {
                final RestStatus status = ((OpenSearchStatusException) cause).status();
                switch (status) {
                case UNAUTHORIZED:
                    logger.warn("[{}] Unauthorized access: {}", i, SystemUtil.getSearchEngineHttpAddress(), cause);
                    break;