code: @Override
      public boolean shutdownService(Object service, BundleContext context)
      {
          for (String alias : getAliases())
          {
              HttpServiceTracker serviceTracker = getServiceTracker(context, BaseWebappServlet.ALIAS, alias);
              if (serviceTracker != null)
                  serviceTracker.close();
          }
          return true;
      }
docs: Start this service.
  Override this to do all the startup.
  @return true if successful.