callbackServer.addInvocationHandler("JMS", new ServerInvocationHandlerImpl()); }
InvokerLocator locator = new InvokerLocator("socket:  callbackServer.setInvokerLocator(locator.getLocatorURI()); callbackServer.start();   callbackServer.addInvocationHandler("JMS", new ServerInvocationHandlerImpl());
   public static Connector getCallbackServer() throws Exception   {      if (callbackServer == null)      {         callbackServer = new Connector();         callbackServer.setInvokerLocator(new InvokerLocator(callbackServerURI).getLocatorURI());         callbackServer.start();         // TODO this is unnecessary         callbackServer.addInvocationHandler("JMS", new ServerInvocationHandlerImpl());      }      return callbackServer;   }