Dynamic Sitemap usinf factory Configuration

@Component(service = Servlet.class, property = {
        "sling.servlet.methods=GET",
        "sling.servlet.resourceTypes=sling/servlet/default",
        "sling.servlet.extensions=sitemap.xml"
})
@Designate(ocd = DynamicSitemapConfig.class, factory = true)
public class DynamicSitemapServlet extends SlingSafeMethodsServlet {

    private static final Logger LOG = LoggerFactory.getLogger(DynamicSitemapServlet.class);

    private String rootPath;
    private List<String> excludedPaths;
    private List<DynamicSitemapServlet> configsList;
    @Activate
    @Modified
    protected void activate(DynamicSitemapConfig config) {
        this.rootPath = config.rootPath();
        this.excludedPaths = Arrays.asList(config.excludedPaths());
    }

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("application/xml");
        response.setCharacterEncoding("UTF-8");

        response.getWriter().write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
        response.flushBuffer();

        ResourceResolver resolver = request.getResourceResolver();
        PageManager pageManager = resolver.adaptTo(PageManager.class);

        if (pageManager == null) {
            LOG.error("PageManager is null.");
            response.getWriter().write("<error>Unable to retrieve PageManager.</error>");
            return;
        }

        Page rootPage = pageManager.getPage(rootPath);
        if (rootPage == null) {
            LOG.error("Root page not found: {}", rootPath);
            response.getWriter().write("<error>Root page not found.</error>");
            return;
        }

        LOG.info("Generating sitemap for root page: {}", rootPage.getPath());

        String domain = getDomainFromRequest(request);
        boolean includeLastModified = shouldIncludeLastModified(rootPage);

        // Generate XML sitemap
        StringBuilder xml = new StringBuilder();
        xml.append("<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">");

        generateSitemap(rootPage, xml, request, includeLastModified);

        xml.append("</urlset>");

        // Write final XML content
        response.getWriter().write(xml.toString());
        response.getWriter().flush();
        response.getWriter().close();
    }
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}