protected OptionalThing<String[]> getQueryLanguages() {
        return LaRequestUtil.getOptionalRequest()
                .map(request -> ComponentUtil.getFessConfig()
                        .getQueryLanguages(request.getLocales(), (String[]) request.getAttribute(Constants.REQUEST_LANGUAGES)));
    }

    /**
     * Builds a default query builder with configured fields and boost values.
     * @param fessConfig The Fess configuration.

        }

        @Override
        public void removeAttribute(String name) {
        }

        @Override
        public Locale getLocale() {
            return null;
        }

        @Override
        public Enumeration<Locale> getLocales() {
            return null;
        }

        @Override
        public boolean isSecure() {
            return false;
        }

        @Override
        public void removeAttribute(String name) {
        }

        @Override
        public java.util.Locale getLocale() {
            return java.util.Locale.getDefault();
        }

        @Override
        public java.util.Enumeration<java.util.Locale> getLocales() {
            return java.util.Collections.emptyEnumeration();
        }

        @Override
        public boolean isSecure() {

        @Override
        public void removeAttribute(String name) {
        }

        @Override
        public java.util.Locale getLocale() {
            return java.util.Locale.getDefault();
        }

        @Override
        public java.util.Enumeration<java.util.Locale> getLocales() {
            return java.util.Collections.emptyEnumeration();
        }

        @Override
        public boolean isSecure() {

            public void removeAttribute(String name) {
            }

            @Override
            public java.util.Locale getLocale() {
                return null;
            }

            @Override
            public java.util.Enumeration<java.util.Locale> getLocales() {
                return null;
            }

            @Override
            public boolean isSecure() {

            public void removeAttribute(String name) {
            }

            @Override
            public java.util.Locale getLocale() {
                return null;
            }

            @Override
            public java.util.Enumeration<java.util.Locale> getLocales() {
                return null;
            }

            @Override
            public boolean isSecure() {

            throw new UnsupportedOperationException();
        }

        @Override
        public Locale getLocale() {
            throw new UnsupportedOperationException();
        }

        @Override
        public java.util.Enumeration<Locale> getLocales() {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isSecure() {

        }
        if (ComponentUtil.getFessConfig().isBrowserLocaleForSearchUsed()) {
            final Set<String> langSet = new HashSet<>();
            final Enumeration<Locale> locales = request.getLocales();
            if (locales != null) {
                while (locales.hasMoreElements()) {
                    final Locale locale = locales.nextElement();

    /**
     * @throws Exception
     */
    public void testGetLocale() throws Exception {
        assertEquals("1", LocaleUtil.getDefault(), LocaleUtil.getLocale(null));
        assertEquals("2", Locale.JAPANESE, LocaleUtil.getLocale("ja"));
        assertEquals("3", Locale.JAPAN, LocaleUtil.getLocale("ja_JP"));
    }

        final FessMessages messages = new FessMessages();
        validationMessagesLambda.message(messages);
        return messageManager.toMessageList(request.getLocale() == null ? Locale.ENGLISH : request.getLocale(), messages)
                .stream()
                .collect(Collectors.joining(" "));
    }

    /**