} catch (final IOException ignore) {}
            return sb.toString();
        };

        if (Constants.TRUE.equalsIgnoreCase(ComponentUtil.getFessConfig().getApiJsonResponseExceptionIncluded())) {
            return stacktraceString.get();
        }

        final String errorCode = UUID.randomUUID().toString();
        if (logger.isDebugEnabled()) {

            });
        } catch (final WebApiException e) {
            String message;
            if (Constants.TRUE.equalsIgnoreCase(ComponentUtil.getFessConfig().getApiJsonResponseExceptionIncluded())) {
                logger.warn("Failed to access to Web API.", e);
                message = e.getMessage();
            } else {
                final String errorCode = UUID.randomUUID().toString();

            } catch (final IOException ignore) {}
            return buf.toString();
        };
        final String message;
        if (Constants.TRUE.equalsIgnoreCase(ComponentUtil.getFessConfig().getApiJsonResponseExceptionIncluded())) {
            message = escapeJsonKeyValue(MESSAGE_FIELD, stacktraceString.get());
        } else {
            final String errorCode = UUID.randomUUID().toString();

     * The value is, e.g. false <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getApiJsonResponseExceptionIncluded();

    /**
     * Is the property for the key 'api.json.response.exception.included' true? <br>
     * The value is, e.g. false <br>