Question

I have a GWT app that I ported to GWT 2.4. Now I geta deprecated warning on this line:

 historyHandler.register(placeController, eventBus, defaultPlace);

“The method register(PlaceController, EventBus, Place) from the type PlaceHistoryHandler is deprecated”

Is there a better way to achieve the same result here or is it safe to ignore the warning?

public void onModuleLoad() 
     {
          // Create ClientFactory using deferred binding so we can replace with
          // different impls in gwt.xml
          ClientFactory clientFactory = GWT.create(ClientFactory.class);
          EventBus eventBus = clientFactory.getEventBus();
          PlaceController placeController = clientFactory.getPlaceController();

          // Start ActivityManager for the main widget with our ActivityMapper
          ActivityMapper activityMapper = new AppActivityMapper(clientFactory);
          ActivityManager activityManager = new ActivityManager(activityMapper, eventBus);
          activityManager.setDisplay(appWidget);

          // Start PlaceHistoryHandler with our PlaceHistoryMapper
          AppPlaceHistoryMapper historyMapper = GWT.create(AppPlaceHistoryMapper.class);
          PlaceHistoryHandler historyHandler = new PlaceHistoryHandler(historyMapper);
          historyHandler.register(placeController, eventBus, defaultPlace);
          RootPanel.get().add(appWidget);

          // Goes to place represented on URL or default place
          historyHandler.handleCurrentHistory();
     }
    } 

Answer 1

The method is deprecated because the EventBus type has moved from com.google.gwt.event.shared to com.google.web.bindery.event.shared. As indicated in the JavaDocs for PlaceHistoryHandler (which don’t make this especially clear) switching your EventBus to the com.google.web.bindery.event.shared.EventBus type will resolve the deprecated warning. That said, for now, both EventBus types are functionally identical and the warning is safe to ignore.