public class ShellAddon {

	private IEventBroker broker;
	
	@Inject
	public ShellAddon(IEventBroker broker) {
		this.broker = broker;
	}

	@Inject
	public void onWindowResize(@UIEventTopic(UIEvents.Window.TOPIC_HEIGHT) Object value) {
		System.out.println("value = " + value.toString());
	}
}

@Inject
public void onWindowResize( @Optional @UIEventTopic(UIEvents.Window.TOPIC_HEIGHT) Event ev) {
	if( ev == null ) return;
	System.out.println("value = " + ev.toString());
}