code: private void trackServletContextHelper(final BundleContext bundleContext, ExtendedHttpServiceRuntime httpServiceRuntime) {
  		final ServiceTracker<ServletContextHelper, ServletContextHelperElement> servletContextHelperTracker =
  				ServletContextHelperTracker.createTracker(extenderContext, bundleContext, httpServiceRuntime);
  
  		servletContextHelperTracker.open();
  		trackers.add(0, servletContextHelperTracker);
  
  	}
docs: Track servlets.
  
  @param bundleContext the BundleContext associated with this bundle
  @param httpServiceRuntime