Issue with customized sitemap generator of servicepack11

Hi,

I am creating sitemapGenratorImpl class to customize sitemap, this is the code I added

@Component(
        service = SitemapGenerator.class,
        property = { "service.ranking:Integer=20" }
)
public class SitemapGeneratorImpl extends ResourceTreeSitemapGenerator {

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

    @Reference
    private SitemapLinkExternalizer externalizer;
    /*@Reference
    private PageTreeSitemapGenerator defaultGenerator;*/
    public void hello(){
        LOG.info("hello from official doc of sitemap");
    }

    @Override
    protected void addResource(@NotNull String name, @NotNull Sitemap sitemap, Resource resource) throws SitemapException {
        Page page = resource.adaptTo(Page.class);
        LOG.info("new sitemap");
        if (page == null) {
            LOG.debug("Skipping resource at {}: not a page", resource.getPath());
            return;
        }
        String location = externalizer.externalize(resource);
        Url url = sitemap.addUrl(location + ".html");
        // add any additional content to the Url like lastmod, change frequency, etc
    }

And in the osgi config console I added this sitemap generator class in the include generator of scheduler,PFA  But its not picking the custom, still OOTB Sitemap generator is getting called.