I added Errai's EventBus to a vanilla GWT app (push notification) without 
using Errai's IOC library ( I am using RequestFactory and GIN/GUICE) and it 
worked fine. 

Here is the Gin configuration: 

@Provides@Singleton
 public RequestDispatcher getRequestDispatcher() {
    return ErraiBus.getDispatcher();
 }

 @Provides
 @Singleton
  public MessageBus getMessageBus() {
    return ErraiBus.get();
}

On the client side inject MessageBus and RequestDispatcher into your class 
and then you can do following things: 

Subscribing: 

messageBus.subscribe("BroadcastReceiver", new MessageCallback() {
    @Override
    public void callback(Message message) {
         //DO SOMETHNG
    }
});

Sending message: 

MessageBuilder.createMessage("ClientComService")
                .noErrorHandling()
                .sendNowWith(dispatcher);

On the server side am using Spring. 

On Saturday, May 11, 2013 11:18:39 PM UTC+2, kim young ill wrote:

hi there, anyone out there has any experience using vanilla gwt with errai 
> ? there're some cool things from errai (event-bus, server-push) i want to 
> use, but i dont want to rewrite the existing-app to use errai, especially 
> gin/guice (i'm using mainly request-factory with guice/gin, 
> place/activities & editor). i look thru the docs of errai & it looks like 
> you're tied to the container injection framework of errai. 
>
> thanx
>

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