### XML Configuration

Fess Crawler uses XML-based configuration with LastaFlute DI. Place configuration files in your classpath:

```xml
<!-- crawler.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
    "http://dbflute.org/meta/lastadi10.dtd">
<components namespace="fessCrawler">
    <component name="crawler" class="org.codelibs.fess.crawler.Crawler" instance="prototype"/>

    }

    /**
     * Logs a message using the provided LogHelper.
     * @param logHelper The LogHelper instance.
     * @param key The LogType key.
     * @param objs The objects to log.
     */
    protected void log(final LogHelper logHelper, final LogType key, final Object... objs) {
        if (logHelper != null) {
            logHelper.log(key, objs);
        }
    }

    /**

        super.insert(accessResult, accessResult.getId() == null ? OpType.CREATE : OpType.INDEX);
    }

    /**
     * Updates an access result in the OpenSearch index.
     *
     * @param accessResult The access result to update.
     */
    @Override
    public void update(final OpenSearchAccessResult accessResult) {
        super.insert(accessResult, OpType.INDEX);
    }

    /**

     * @param <T> The type of objects to insert.
     * @param list The list of objects to insert.
     * @param opType The operation type (CREATE, INDEX, etc.).
     * @throws OpenSearchAccessException if the bulk insertion fails.
     */
    protected <T> void insertAll(final List<T> list, final OpType opType) {
        insertAll(list, opType, false);
    }

    /**

        super();
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.helper.LogHelper#log(org.codelibs.fess.crawler.log.LogType,
     * java.lang.Object)
     */
    @Override
    public void log(final LogType key, final Object... objs) {
        switch (key) {
        case START_THREAD:
            processStartThread(objs);
            break;
        case START_CRAWLING:

     * @param urlQueue The URL queue entry to insert.
     */
    @Override
    public void insert(final OpenSearchUrlQueue urlQueue) {
        try {
            super.insert(urlQueue, urlQueue.getId() == null ? OpType.CREATE : OpType.INDEX);
        } catch (final OpenSearchAccessException e) {
            final Throwable cause = e.getCause();
            if (cause != null && "VersionConflictEngineException".equals(cause.getClass().getSimpleName())) {

        httpClientContext.setAuthCache(authCache);
        httpClientContext.setCredentialsProvider(credentialsProvider);

        // Request Header
        final RequestHeader[] requestHeaders = { new RequestHeader("enctype", "multipart/form-data") };
        for (final RequestHeader requestHeader : requestHeaders) {
            if (requestHeader.isValid()) {