crawler.crawlerContext.setNumOfThread(5);
        crawler.urlFilter.addInclude("https://example.com/.*");
        
        // Execute crawling
        String sessionId = crawler.execute();
        System.out.println("Crawling completed. Session ID: " + sessionId);
    }
}
```

### File System Crawling

```java
import org.codelibs.fess.crawler.client.fs.FileSystemClient;

// Configure for file system crawling

        context.put("thread", Thread.currentThread().getName());
        context.put("threadId", Thread.currentThread().getId());

        String sessionId = MDC.get("sessionId");
        if (sessionId != null) {
            context.put("sessionId", sessionId);
        }
        String userId = MDC.get("userId");
        if (userId != null) {
            context.put("userId", userId);
        }
    }

     * Initiates crawling for specified web and file configurations.
     *
     * @param sessionId The session ID for this crawling operation
     * @param webConfigIdList List of web configuration IDs to crawl, null for all
     * @param fileConfigIdList List of file configuration IDs to crawl, null for all
     */
    public void crawl(final String sessionId, final List<String> webConfigIdList, final List<String> fileConfigIdList) {

        final ChatSession session = sessionCache.get(sessionId);
        if (session == null) {
            if (logger.isDebugEnabled()) {
                logger.debug("Session not found. sessionId={}", sessionId);
            }
            return null;
        }
        if (isExpired(session)) {
            sessionCache.remove(sessionId);
            if (logger.isDebugEnabled()) {

        assertArrayEquals(testKey, rawKey2, "Should still match original");
    }

    @Test
    public void testRemoveSessionKey() {
        String sessionId = "test-session-3";
        keyManager.storeSessionKey(sessionId, testKey, "AES");

        assertTrue(keyManager.hasSessionKey(sessionId), "Key should exist");

        keyManager.removeSessionKey(sessionId);

        // Get the sessionId field using reflection
        Field sessionIdField = NtlmPasswordAuthenticator.class.getDeclaredField("sessionId");
        sessionIdField.setAccessible(true);

        // Initially sessionId should be null
        String initialSessionId = (String) sessionIdField.get(authenticator);
        assertNull(initialSessionId, "SessionId should initially be null");
    }

    @Test

     * @param sessionId The session ID.
     */
    @Override
    public void delete(final String sessionId) {
        deleteBySessionId(sessionId);
        includeFilterCache.invalidate(sessionId);
        excludeFilterCache.invalidate(sessionId);
    }

    /**
     * Gets the list of include URL patterns for the specified session.
     *
     * @param sessionId The session ID.

     * @return The session ID.
     */
    public String getSessionId() {
        return sessionId;
    }

    /**
     * Sets the session ID.
     * @param sessionId The session ID.
     */
    public void setSessionId(final String sessionId) {
        this.sessionId = sessionId;
    }

    /**
     * Returns the current active thread count.
     * @return The active thread count.

        sessionContexts.put(sessionId, context);

        log.debug("Initialized preauth integrity context for session {}", sessionId);
        return context;
    }

    /**
     * Updates the preauth integrity hash with a new message.
     *
     * @param sessionId the session identifier
     * @param messageData the message data to include in hash

            }

            final String sessionId;
            if (searchLog.getUserSessionId() != null) {
                sessionId = searchLog.getUserSessionId();
            } else if (Constants.SEARCH_LOG_ACCESS_TYPE_WEB.equals(searchLog.getAccessType())) {
                sessionId = searchLog.getClientIp();
            } else {
                sessionId = searchLog.getClientIp() + '_' + searchLog.getSearchWord();