assertFalse(renewed, "renewCredentials should return false when NtlmAuthenticator.getDefault() is null");
            assertEquals(mockCredentials, wrapper.getCredentials(),
                    "Credentials should remain unchanged if NtlmAuthenticator.getDefault() is null");
            mockedNtlmAuthenticator.verify(NtlmAuthenticator::getDefault);

        assertEquals(TimeZone.getDefault(), result);
    }

    // Test getRequestedTimeZone() with different default time zone
    public void test_getRequestedTimeZone_withDifferentDefaultTimeZone() {
        // Store original time zone
        TimeZone originalTimeZone = TimeZone.getDefault();

        try {
            // Change default time zone temporarily

        return toDate(src, null, LocaleUtil.getDefault());
    }

    /**
     * Converts an object to {@link Date}.
     *
     * @param src the source object
     * @param pattern the pattern string
     * @return the converted {@link Date}
     */
    public static Date toDate(final Object src, final String pattern) {
        return toDate(src, pattern, LocaleUtil.getDefault());
    }

    /**

     *
     * @return the pattern string for {@link DateFormat#SHORT} style
     */
    public static String getShortPattern() {
        return getShortPattern(LocaleUtil.getDefault());
    }

    /**
     * Returns the pattern string for {@link DateFormat#SHORT} style in the specified locale.
     *
     * @param locale
     *            Locale. Must not be {@literal null}.

     *
     * @return the pattern string for {@link DateFormat#SHORT} style
     */
    public static String getShortPattern() {
        return getShortPattern(LocaleUtil.getDefault());
    }

    /**
     * Returns the pattern string for {@link DateFormat#SHORT} style using the specified locale.
     *
     * @param locale
     *            Locale. Must not be {@literal null}.

     */
    public static Locale getDefault() {
        if (defaultLocaleSupplier != null) {
            return defaultLocaleSupplier.get();
        }
        return Locale.ENGLISH;
    }

    /**
     * Sets the default locale supplier.
     *
     * @param localeSupplier
     *            the supplier for the default locale
     */
    public static void setDefault(final Supplier<Locale> localeSupplier) {

        // Store original timezone settings
        originalTimeZone = TimeZone.getDefault();
        originalProvider = getDBFluteSystemTimeZoneProvider();
    }

    @Override
    public void tearDown() throws Exception {
        // Restore original timezone settings
        TimeZone.setDefault(originalTimeZone);
        if (originalProvider != null) {
            DBFluteSystem.unlock();

    // required. These socket factories explicitly set the buffer sizes on sockets created.
    server = MockWebServer()
    server.serverSocketFactory =
      object : DelegatingServerSocketFactory(getDefault()) {
        @Throws(SocketException::class)
        override fun configureServerSocket(serverSocket: ServerSocket): ServerSocket {
          serverSocket.setReceiveBufferSize(SOCKET_BUFFER_SIZE)
          return serverSocket

     * Returns {@link DecimalFormatSymbols}.
     *
     * @return {@link DecimalFormatSymbols}
     */
    public static DecimalFormatSymbols getDecimalFormatSymbols() {
        return getDecimalFormatSymbols(LocaleUtil.getDefault());
    }

    /**
     * Returns {@link DecimalFormatSymbols}.
     *
     * @param locale
     *            The locale. Must not be {@literal null}.
     * @return {@link DecimalFormatSymbols}
     */

/**
 * The provider of user time-zone process.
 *
 * @author jflute
 */
public class FessUserTimeZoneProcessProvider implements UserTimeZoneProcessProvider {

    public static final TimeZone centralTimeZone = TimeZone.getDefault();

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

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

    @Override