ns = (NamingService)serviceBroker.getService(this, NamingService.class, null); if (ns == null) { throw new RuntimeException("no naming service?!"); }
  protected Servlet createServlet() {    wps = (WhitePagesService)serviceBroker.getService(this, WhitePagesService.class, null);    if(wps == null) {      throw new RuntimeException("no WhitePagesService.");    }    return new MyServlet();  }