code: private void trackServlets(final BundleContext bundleContext) {
  		final ServiceTracker<Servlet, ServletWebElement> servletTracker = ServletTracker
  				.createTracker(extenderContext, bundleContext);
  
  		servletTracker.open();
  		trackers.add(0, servletTracker);
  
  		final ServiceTracker<ServletMapping, ServletMappingWebElement> servletMappingTracker = ServletMappingTracker
  				.createTracker(extenderContext, bundleContext);
  
  		servletMappingTracker.open();
  		trackers.add(0, servletMappingTracker);
  	}
docs: Track servlets.
  
  @param bundleContext the BundleContext associated with this bundle