try {
            systemHelper.setLogLevel("DEBUG");
            assertEquals("DEBUG", systemHelper.getLogLevel());
            systemHelper.setLogLevel("INFO");
            assertEquals("INFO", systemHelper.getLogLevel());
            systemHelper.setLogLevel("WARN");
            assertEquals("WARN", systemHelper.getLogLevel());
            systemHelper.setLogLevel("ERROR");

        systemHelper.refreshDesignJspFiles();
        systemHelper.updateSystemProperties();

        if (StringUtil.isNotBlank(form.logLevel)) {
            systemHelper.setLogLevel(form.logLevel);
        }
    }

    public static void updateForm(final FessConfig fessConfig, final EditForm form) {
        form.loginRequired = fessConfig.isLoginRequired() ? Constants.TRUE : Constants.FALSE;

            MavenSimpleLogger stderr = (MavenSimpleLogger) context.loggerFactory.getLogger("stderr");
            stdout.setLogLevel(LocationAwareLogger.INFO_INT);
            stderr.setLogLevel(LocationAwareLogger.INFO_INT);
            System.setOut(new LoggingOutputStream(s -> stdout.info("[stdout] " + s)).printStream());

            });
        } catch (final Exception e) {
            final CrawlingAccessException rcae = new CrawlingAccessException("Could not get a text from " + responseData.getUrl(), e);
            rcae.setLogLevel(CrawlingAccessException.WARN);
            throw rcae;
        }
        if (content == null) {
            content = StringUtil.EMPTY;
        }

        return response;
    }

    public HtmlResponse getRedirectResponseToRoot(final HtmlResponse response) {
        return response;
    }

    public void setLogLevel(final String level) {
        final Level logLevel = Level.toLevel(level, Level.WARN);
        System.setProperty(Constants.FESS_LOG_LEVEL, logLevel.toString());