*
     * @param doc The XML document.
     * @param xpath The XPath expression.
     * @return A list of XPath nodes.
     * @throws XPathExpressionException if an XPath expression error occurs.
     */
    protected XPathNodes getNodeList(final Document doc, final String xpath) throws XPathExpressionException {
        final XPath xPathApi = getXPathAPI().createXPath(f -> {});

 *
 * This class is tolerant of some I/O errors. If files are missing from the filesystem, the
 * corresponding entries will be dropped from the cache. If an error occurs while writing a cache
 * value, the edit will fail silently. Callers should handle other problems by catching
 * `IOException` and responding appropriately.
 *

            try {
                return func.apply(this).actionGet(connTimeout, TimeUnit.MILLISECONDS);
            } catch (final IndexNotFoundException | VersionConflictEngineException e) {
                logger.debug("{} occurs.", e.getClass().getName(), e);
                throw e;
            } catch (final Exception e) {
                if (retryCount > maxRetryCount) {
                    throw e;
                }

                logger.info("Finished Crawler");
            }

            return Constants.EXIT_OK;
        } catch (final Throwable t) {
            logger.warn("An exception occurs on the crawl task.", t);
            return Constants.EXIT_FAIL;
        } finally {
            pathMappingHelper.removePathMappingList(options.sessionId);

     * @return the redirect URL if a redirect occurred, null otherwise
     * @throws ChildUrlsException if child URLs are discovered during processing
     * @throws DataStoreCrawlingException if an error occurs during crawling
     */
    protected String processRequest(final DataStoreParams paramMap, final Map<String, Object> dataMap, final String url,
            final CrawlerClient client) {

        };
    }

    /**
     * Returns the signing key for SMB signing.
     *
     * @param challenge the server challenge bytes
     * @return the signing key
     * @throws SmbException if an error occurs generating the signing key
     */
    public byte[] getSigningKey(final byte[] challenge) throws SmbException {
        switch (LM_COMPATIBILITY) {
        case 0:
        case 1:
        case 2:

        }
    }

    /**
     * Internal method to send a request to the server.
     *
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected void doSend0(final Request request) throws IOException {
        try {
            doSend(request);
        } catch (final IOException ioe) {
            if (LogStream.level > 2) {

     *
     * @param inputStream the input stream to read from
     * @return the detected character set name, or null if not found
     * @throws CrawlingAccessException if an error occurs while reading the content
     */
    protected String loadCharset(final InputStream inputStream) {
        BufferedInputStream bis = null;
        String encoding = null;
        try {

     * @throws EmptyArgumentException
     *             If the class name is {@literal null} or empty.
     * @throws ClassNotFoundRuntimeException
     *             If a {@link ClassNotFoundException} occurs.
     * @see #forName(String)
     */
    public static Class<?> convertClass(final String className) throws ClassNotFoundRuntimeException {
        assertArgumentNotEmpty("className", className);

</p>
<ul>
	<li>a <a href="#Constants">constant</a> index must be in range</li>
	<li>if <code>x</code> is out of range at run time,
	    a <a href="#Run_time_panics">run-time panic</a> occurs</li>
	<li><code>a[x]</code> is the array element at index <code>x</code> and the type of
	    <code>a[x]</code> is the element type of <code>A</code></li>
</ul>

<p>