stream(user.getGroupNames()).of(stream -> stream.forEach(name -> {
                            if (oldGroupList.contains(name)) {
                                oldGroupList.remove(name);
                                newGroupList.remove(name);
                            }
                        }));
                        oldGroupList.stream().forEach(name -> {

     */
    public static void forEach(final JarFile jarFile, final ClassHandler handler) {
        assertArgumentNotNull("jarFile", jarFile);
        assertArgumentNotNull("handler", handler);

        if (jarFile.getName().toLowerCase().endsWith(WAR_FILE_EXTENSION)) {
            forEach(jarFile, WEB_INF_CLASSES_PATH, handler);
        } else {
            forEach(jarFile, "", handler);
        }
    }

            // set urls
            split(urlsStr, "[\r\n]").of(stream -> stream.filter(StringUtil::isNotBlank).map(String::trim).distinct().forEach(urlValue -> {
                if (!urlValue.startsWith("#") && protocolHelper.isValidWebProtocol(urlValue)) {
                    final String u = duplicateHostHelper.convert(urlValue);
                    crawler.addUrl(u);

     * @param handler the handler to process resources (must not be {@literal null})
     */
    public static void forEach(final File rootDir, final ResourceHandler handler) {
        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**
     * Traverses resources contained in the file system.
     * <p>

        stream(params.getExtraQueries())
                .of(stream -> stream.filter(q -> StringUtil.isNotBlank(q) && q.length() <= maxQueryLength).forEach(q -> {
                    appendQuery(queryBuf, q);
                }));

        stream(params.getFields()).of(stream -> stream.forEach(entry -> {
            final String key = entry.getKey();
            final String[] values = entry.getValue();
            if (values == null) {

            return file.exists();
        }

        @Override
        public void forEach(final ClassHandler handler) {
            ClassTraversalUtil.forEach(baseDir, rootPackage, handler);
        }

        @Override
        public void forEach(final ResourceHandler handler) {
            ResourceTraversalUtil.forEach(baseDir, rootDir, handler);
        }

        @Override
        public void close() {

        StreamUtil.stream(request.getParameterMap())
                .of(stream -> stream.filter(e -> e.getKey().startsWith("geo.") && e.getKey().endsWith(".point")).forEach(e -> {
                    final String key = e.getKey();
                    for (final String geoField : geoFields) {
                        if (key.startsWith("geo." + geoField + ".")) {

                stream(baseTags).of(stream -> stream.forEach(tag -> popularWordsRequestBuilder.addTag(tag)));
                stream(baseRoles).of(stream -> stream.forEach(role -> popularWordsRequestBuilder.addRole(role)));
                stream(baseFields).of(stream -> stream.forEach(field -> popularWordsRequestBuilder.addField(field)));
                stream(baseExcludes).of(stream -> stream.forEach(exclude -> popularWordsRequestBuilder.addExcludeWord(exclude)));

                        .forEach(s -> messages.addErrorsPropertyRequired(s, s)));
            }

            if (!fessConfig.validateIndexArrayFields(doc)) {
                throwError.accept(messages -> fessConfig.invalidIndexArrayFields(doc)
                        .stream()
                        .map(s -> "doc." + s)
                        .forEach(s -> messages.addErrorsPropertyRequired(s, s)));

            final String key = LaFunctions.u(e.getKey());
            stream(e.getValue()).of(stream -> stream.filter(StringUtil::isNotBlank)
                    .forEach(s -> pagingQueryList.add("fields." + key + "=" + LaFunctions.u(s))));
        });
        form.as.entrySet().stream().filter(e -> e.getValue() != null).forEach(e -> {