// Test with null regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, null);
        assertEquals(0, cmdList.size());

        // Test with empty regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, "");
        assertEquals(0, cmdList.size());

        // Clean up
        System.clearProperty("custom.prop.one");

            if (logger.isDebugEnabled()) {
                logger.debug("Cannot clear session, not found. sessionId={}", sessionId);
            }
            return false;
        }
        // Verify ownership
        final String sessionUserId = session.getUserId();
        if (userId != null && !userId.equals(sessionUserId)) {
            logger.warn("Cannot clear session, userId mismatch. sessionId={}, requestUserId={}", sessionId, userId);

        });
    }

    /**
     * Clears the chat session.
     *
     * @param form the chat form containing the session ID to clear
     * @return the HTML response redirecting to the chat page
     */
    @Execute
    public HtmlResponse clear(final ChatForm form) {
        if (form.sessionId != null) {
            if (logger.isDebugEnabled()) {

            return messages != null ? messages.size() : 0;
        }
    }

    /**
     * Clears all messages in this session and updates the last accessed timestamp.
     */
    public void clearMessages() {
        synchronized (messagesLock) {
            if (messages != null) {
                messages.clear();
            }
        }
        this.lastAccessedAt = LocalDateTime.now();
    }

    /**

func imag(c ComplexType) FloatType

// The clear built-in function clears maps and slices.
// For maps, clear deletes all entries, resulting in an empty map.
// For slices, clear sets all elements up to the length of the slice
// to the zero value of the respective element type. If the argument
// type is a type parameter, the type parameter's type set must
// contain only map or slice types, and clear performs the operation

- **UrlConvertHelper**: URL normalization
- **ContentLengthHelper**: Content length limits per MIME type

---

## Development Workflow

### Build Commands

```bash
mvn clean install              # Build all
mvn clean install -DskipTests  # Skip tests
mvn test                       # Run tests
mvn formatter:format           # Format code
mvn license:format             # Update license headers
```

    try {
      if (inheritableThreadLocals != null) {
        inheritableThreadLocals.set(thread, null);
      }
    } catch (Throwable t) {
      logger.log(
          Level.INFO,
          "Failed to clear thread local values inherited by reference finalizer thread.",
          t);
    }

    thread.start();
  }

  private final WeakReference<Class<?>> finalizableReferenceClassReference;

    try {
      if (inheritableThreadLocals != null) {
        inheritableThreadLocals.set(thread, null);
      }
    } catch (Throwable t) {
      logger.log(
          Level.INFO,
          "Failed to clear thread local values inherited by reference finalizer thread.",
          t);
    }

    thread.start();
  }

  private final WeakReference<Class<?>> finalizableReferenceClassReference;

   * clear()} clears all table mappings.
   */
  @WeakOuter
  private abstract class TableSet<T> extends ImprovedAbstractSet<T> {
    @Override
    public boolean isEmpty() {
      return backingMap.isEmpty();
    }

    @Override
    public void clear() {
      backingMap.clear();
    }
  }

  /**
   * {@inheritDoc}
   *

    @Override
    protected boolean isUseOneTimeContainer() {
        return true;
    }

    @Test
    public void test_maxUsernameLength() throws IOException {
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public Integer getLdapMaxUsernameLengthAsInteger() {
                return Integer.valueOf(-1);
            }
        };