* @param hostname The parameter value of hostname. (NotNull)
     */
    public void setHostname(String hostname) {
        registerVariable("hostname", hostname);
    }

    /**
     * Set the value of jobname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.

        method.setAccessible(true);

        // Test with null thread
        try {
            method.invoke(crawler, (Thread) null);
        } catch (Exception e) {
            fail("Should not throw exception with null thread");
        }

        // Test with normal thread
        Thread testThread = new Thread(() -> {
            try {

        assertNull(exception.getCause());
        assertNull(exception.getMessage());
        assertTrue(exception instanceof FessSystemException);
    }

    @Test
    public void test_constructorWithNullMessageAndCause() {
        // Test constructor with null message and null cause
        SearchQueryException exception = new SearchQueryException(null, null);

        assertNull(exception.getMessage());

    protected String detailedMessage(final Throwable t) {
        if (t == null) {
            return "Unknown";
        }
        Throwable target = t;
        if (target.getCause() == null) {
            return target.getClass().getSimpleName() + "[" + target.getMessage() + "]";
        }
        final StringBuilder sb = new StringBuilder();
        while (target != null) {
            sb.append(target.getClass().getSimpleName());

fi

if [ "$REMOVE_SERVICE" = "true" ]; then
    if command -v systemctl >/dev/null; then
        systemctl --no-reload disable fess.service > /dev/null 2>&1 || true
    fi

    if command -v chkconfig >/dev/null; then
        chkconfig --del fess 2> /dev/null || true
    fi

    if command -v update-rc.d >/dev/null; then
        update-rc.d fess remove >/dev/null || true
    fi
fi

if [ "$REMOVE_DIRS" = "true" ]; then

        if (createdBy != null) {
            addFieldToSource(sourceMap, "createdBy", createdBy);
        }
        if (createdTime != null) {
            addFieldToSource(sourceMap, "createdTime", createdTime);
        }
        if (generator != null) {
            addFieldToSource(sourceMap, "generator", generator);
        }
        if (path != null) {
            addFieldToSource(sourceMap, "path", path);

     *
     * @param obj the object containing anchor URLs (String or List of Strings)
     * @return a set of RequestData objects for the anchor URLs, or null if no valid URLs found
     */
    protected Set<RequestData> getAnchorSet(final Object obj) {
        if (obj == null) {
            return null;
        }

        List<String> anchorList;
        if (obj instanceof final String s) {
            anchorList = List.of(s);

                    final Map<String, SearchHits> innerHits = searchHit.getInnerHits();
                    if (innerHits != null) {
                        final SearchHits innerSearchHits = innerHits.get(fessConfig.getQueryCollapseInnerHitsName());
                        if (innerSearchHits != null) {
                            final long totalHits = innerSearchHits.getTotalHits().value();
                            if (totalHits > 1) {

        IndexUpdateCallback callback = new TestIndexUpdateCallback();

        // Execute with null config
        dataStore.store(null, callback, params);

        assertTrue(storeCalled.get());
    }

    @Test
    public void test_store_withNullCallback() {
        // Test store with null callback
        final AtomicBoolean storeCalled = new AtomicBoolean(false);

        dataStore = new DataStore() {

     */
    public void setMessages(final List<ChatMessage> messages) {
        synchronized (messagesLock) {
            if (messages == null) {
                this.messages = null;
            } else if (messages instanceof CopyOnWriteArrayList) {
                this.messages = messages;
            } else {
                this.messages = new CopyOnWriteArrayList<>(messages);
            }
        }