*/
  @JvmOverloads
  fun charset(defaultValue: Charset? = null): Charset? {
    val charset = parameter("charset") ?: return defaultValue
    return try {
      Charset.forName(charset)
    } catch (_: IllegalArgumentException) {
      defaultValue // This charset is invalid or unsupported. Give up.
    }
  }

  /**

        assertFalse(channelInfo.isHealthy());
    }

    @Test
    void testActivityTracking() {
        long initialTime = channelInfo.getLastActivityTime();

        // Wait a bit and update activity
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        channelInfo.updateActivity();

Configure and install casdoor server by following [Casdoor Server Installation](https://casdoor.org/docs/basic/server-installation).
For a quick installation, docker-compose reference configs are also available on the [Casdoor Try with Docker](https://casdoor.org/docs/basic/try-with-docker).

### Configure Casdoor

- Go to Applications
  - Create or use an existing Casdoor application
  - Edit the application
    - Copy `Client ID` and `Client secret`

        verifyPassword(form, this::asEditHtml);
        verifyToken(this::asEditHtml);
        getUser(form).ifPresent(entity -> {
            try {
                userService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {

        testTransformer.setName("exceptionTransformer");
        testTransformer.setThrowException(true);

        ResponseData responseData = new ResponseData();

        try {
            testTransformer.transform(responseData);
            fail("Should throw CrawlerSystemException");
        } catch (CrawlerSystemException e) {
            assertEquals("Test exception", e.getMessage());

     */
    public static SID CREATOR_OWNER = null;
    /**
     * Well known SID: SYSTEM (S-1-5-18).
     */
    public static SID SYSTEM = null;

    static {
        try {
            EVERYONE = new SID("S-1-1-0");
            CREATOR_OWNER = new SID("S-1-3-0");
            SYSTEM = new SID("S-1-5-18");
        } catch (final SmbException se) {}
    }

     */
    public String execute() {
        final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();

        final StringBuilder resultBuf = new StringBuilder();

        try {
            searchLogHelper.storeSearchLog();
        } catch (final Exception e) {
            logger.error("Failed to store a search log.", e);
            resultBuf.append(e.getMessage()).append("\n");
        }

                return filterPropertyAsDefault(filteredValue); // not null here
            }

            private String getFromCache(final String propertyKey) {
                try {
                    return cache.get(propertyKey,
                            () -> System.getProperty(Constants.FESS_CONFIG_PREFIX + propertyKey, super.get(propertyKey)));
                } catch (final ExecutionException e) {

        })
        .build();
  }

  public void run() throws Exception {
    Request request = new Request.Builder()
        .url("http://publicobject.com/secrets/hellosecret.txt")
        .build();

    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

      System.out.println(response.body().string());
    }
  }

@GwtCompatible
@NullMarked
public abstract class SloppyTearDown implements TearDown {
  private static final Logger logger = Logger.getLogger(SloppyTearDown.class.getName());

  @Override
  public final void tearDown() {
    try {
      sloppyTearDown();
    } catch (Throwable t) {
      logger.log(Level.INFO, "exception thrown during tearDown: " + t.getMessage(), t);
    }
  }

  public abstract void sloppyTearDown() throws Exception;