assertEquals(Locale.GERMANY, result1.get());
        assertEquals(Locale.GERMANY, result2.get());
        assertEquals(Locale.GERMANY, result3.get());
    }

    // Helper method to create mock RequestManager
    private RequestManager createMockRequestManager(final String paramValue) {
        return new org.lastaflute.web.servlet.request.SimpleRequestManager() {
            @Override

     * Constructs a new FessActionValidator with the specified components.
     *
     * @param requestManager the request manager for handling HTTP requests
     * @param messagesCreator the creator for user messages
     * @param runtimeGroups the runtime validation groups
     */
    public FessActionValidator(final RequestManager requestManager, final UserMessagesCreator<MESSAGES> messagesCreator,
            final Class<?>[] runtimeGroups) {

        return false;
    }

    @Override
    public OptionalThing<TimeZone> findBusinessTimeZone(final ActionRuntime runtimeMeta, final RequestManager requestManager) {
        return OptionalObject.empty();
    }

    @Override
    public TimeZone getRequestedTimeZone(final RequestManager requestManager) { // not null
        return centralTimeZone; // you can change it if you like
    }

    @Override
    public String toString() {

import org.lastaflute.web.ruts.process.ActionRuntime;
import org.lastaflute.web.servlet.request.RequestManager;
import org.lastaflute.web.servlet.request.SimpleRequestManager;

public class FessUserTimeZoneProcessProviderTest extends UnitFessTestCase {

    private FessUserTimeZoneProcessProvider provider;
    private RequestManager requestManager;

    @Override
    protected void setUp(TestInfo testInfo) throws Exception {

    public OptionalThing<Locale> findBusinessLocale(final ActionRuntime runtimeMeta, final RequestManager requestManager) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String name = fessConfig.getQueryBrowserLangParameterName();
        if (StringUtil.isNotBlank(name)) {
            try {
                return requestManager.getParameter(name).filter(StringUtil::isNotBlank).map(LocaleUtils::toLocale);

    @Resource
    private MessageManager messageManager;

    /** Manager for handling HTTP request operations. */
    @Resource
    private RequestManager requestManager;

    // ===================================================================================
    //                                                                               Hook

        try {
            FessActionValidator.class.getConstructor(RequestManager.class, UserMessagesCreator.class, Class[].class);
            assertTrue("Constructor with required parameters exists", true);
        } catch (final NoSuchMethodException e) {
            fail("Constructor with RequestManager, UserMessagesCreator, and Class[] parameters should exist");
        }
    }

    @Test

    /**
     * Creates a new action validator.
     *
     * @param requestManager  The request manager.
     * @param messagesCreator The messages creator.
     * @param runtimeGroups   The runtime groups.
     * @return A new action validator.
     */
    public ActionValidator<FessMessages> createValidator(final RequestManager requestManager,

    public void process(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain)
            throws IOException, ServletException {
        final RequestManager requestManager = ComponentUtil.getRequestManager();
        if (!requestManager.findUserBean(FessUserBean.class).map(user -> user.hasRoles(acceptedRoles)).orElse(Boolean.FALSE)) {

            }

            final boolean hasAccessToken = processAccessToken(request, roleSet, isApiRequest);

            final RequestManager requestManager = ComponentUtil.getRequestManager();
            try {
                requestManager.findUserBean(FessUserBean.class)
                        .ifPresent(fessUserBean -> stream(fessUserBean.getPermissions()).of(stream -> stream.forEach(roleSet::add)))