}
        });

        List<Path> fileList = systemHelper.refreshDesignJspFiles();
        assertEquals(0, fileList.size());

        virtualHostList.add(new Tuple3<>("abc.example.com", "8080", "host1"));
        fileList = systemHelper.refreshDesignJspFiles();
        assertEquals(0, fileList.size());

        systemHelper.addDesignJspFileName("xxx", "yyy.jsp");

        fessConfig.storeSystemProperties();
        ComponentUtil.getLdapManager().updateConfig();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        systemHelper.refreshDesignJspFiles();
        systemHelper.updateSystemProperties();

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

    /**

    }

    /**
     * Refreshes the design JSP files for all virtual hosts.
     *
     * @return A list of paths to the refreshed files.
     */
    public List<Path> refreshDesignJspFiles() {
        final List<Path> fileList = new ArrayList<>();
        stream(ComponentUtil.getVirtualHostHelper().getVirtualHostPaths())