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();
    }

    /**

        // 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()) {

                try {
                    final int sessionIdListSize = finishedSessionIdList.size();
                    intervalControlHelper.setCrawlerRunning(true);

                    docList.clear();
                    accessResultList.clear();

                    updateTime = systemHelper.getCurrentTimeAsLong() - updateTime;

                    final long interval = updateInterval - updateTime;

- Check that locale code is in `supported.languages` in `fess_config.properties`
- Regenerate Java classes: `mvn dbflute:freegen`
- Rebuild project: `mvn clean package`
- Restart Fess application

### Translations not showing

- Clear browser cache
- Force language with `?browser_lang=[locale]` parameter
- Check property file encoding (should be UTF-8 or use Unicode escapes `\uXXXX`)

        userPager.setAllPageCount(10);
        userPager.setExistPrePage(true);
        userPager.setExistNextPage(true);

        userPager.clear();

        assertNull(userPager.id);
        // Note: name is not cleared by clear() method
        assertNull(userPager.roles);
        assertNull(userPager.groups);
        assertNull(userPager.versionNo);
        assertEquals(0, userPager.getAllRecordCount());

        assertEquals(2000, intervalControlHelper.getDelay());

        intervalControlHelper.ruleList.clear();

        intervalControlHelper.addIntervalRule("12:15", "12:15", "*", 3000);
        assertEquals(3000, intervalControlHelper.getDelay());

        intervalControlHelper.ruleList.clear();

        intervalControlHelper.addIntervalRule("12:15", "12:15", "3,5", 4000);

            for (int j = 0; j < 10; j++) {
                assertTrue("Thread " + i + " should find doc" + j, containsResults[i][j]);
            }
        }
    }

    /**
     * Test that clear operation on deleteUrlList is thread-safe.
     */
    @Test
    public void test_deleteUrlList_clearOperation() throws Exception {
        IndexUpdateCallback mockCallback = new IndexUpdateCallback() {

import org.codelibs.fess.unit.UnitFessTestCase;

public class SynonymPagerTest extends UnitFessTestCase {

    public void test_SynonymPager() {
        SynonymPager synonymPager = new SynonymPager();

        synonymPager.clear();
        assertEquals(0, synonymPager.getAllRecordCount());
        assertEquals(0, synonymPager.getAllPageCount());
        assertEquals(false, synonymPager.isExistPrePage());