On Friday, January 21, 2011 12:59:12 AM UTC+1, Romain BIARD wrote:
>
> Hi everybody,
>
> I'm currently trying to integrate GIN on a POC which deals with
> RequestFactory and EventBus.
> 1) I first noticed that I had to extends some Technical Classes with
> no reasons except to mark the constructor whit @Inject like this :
>
> public class PamdaPlaceHistoryHandler extends PlaceHistoryHandler {
>
> @Inject
> public PamdaPlaceHistoryHandler(PlaceHistoryMapper mapper) {
> super(mapper);
> }
> }
>
Or you could simply use a Provider and bind() it explicitly in your
GinModule, or (even more simple) use @Provides method in your GinModule:
@Provides
PlaceHistoryHandle providePlaceHistoryHandler(PlaceHistoryMapper mapper)
{
return new PlaceHistoryHandler(mapper);
}
> 2) After initializing the injector and create all the singletons
> through GIN (eventBus, RequestFactory and so on ...), my app threw a
> NPE when fire a event in order to retrieve Proxies through Request
> Factory ..... Here's the stack :
>
>
> Caused by: com.google.gwt.event.shared.UmbrellaException: One or more
> exceptions caught, see full set in UmbrellaException#getCauses
> at
> com.google.gwt.activity.shared.ActivityManager.onPlaceChange(ActivityManager.java:
>
>
> 173)
> at
> com.google.gwt.place.shared.PlaceChangeEvent.dispatch(PlaceChangeEvent.java:
>
> 52)
> at
> com.google.gwt.place.shared.PlaceChangeEvent.dispatch(PlaceChangeEvent.java:
>
> 1)
> at
> com.google.gwt.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:
> 204)
> at
> com.google.gwt.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:
> 103)
> at
> com.google.gwt.place.shared.PlaceController.goTo(PlaceController.java:
> 115)
> at
> com.google.gwt.place.shared.PlaceHistoryHandler.handleHistoryToken(PlaceHistoryHandler.java:
>
>
> 179)
> at
> com.google.gwt.place.shared.PlaceHistoryHandler.handleCurrentHistory(PlaceHistoryHandler.java:
>
>
> 117)
> at
> com.francetelecom.entreprise.fme.client.Pamda.onModuleLoad(Pamda.java:
> 36)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
> 39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
>
>
> 25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:
> 396)
> at
> com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:
>
>
> 183)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
>
>
> 510)
> at
> com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
>
> 352)
> at java.lang.Thread.run(Thread.java:680)
> Caused by: java.lang.NullPointerException: null
> at
> com.google.gwt.requestfactory.shared.impl.AbstractRequestContext.doFire(AbstractRequestContext.java:
>
>
> 606)
> at
> com.google.gwt.requestfactory.shared.impl.AbstractRequestContext.fire(AbstractRequestContext.java:
>
>
> 210)
> at
> com.google.gwt.requestfactory.shared.impl.AbstractRequest.fire(AbstractRequest.java:
>
>
> 54)
> at
> com.google.gwt.requestfactory.shared.impl.AbstractRequest.fire(AbstractRequest.java:
>
>
> 59)
>
> The cause of this NPE seems to come from the request Factory which
> hasn't been initialized with the EventBus....
>
> Am I supose to call requestFactory.initialize(eventBus) each time i
> would make a call? Am I wrong on initialization on my App ?
>
It's hard to tell: are you ever calling initialize(eventBus) somewhere on
the initialization of your app?
FWIW, I register() the PlaceHistoryHandler in my EntryPoint's onModuleLoad,
but I initialize() the RequestFactory from within a @Provides method in my
GinModule, where I explicitly call the GWT.create():
@Provides
@Singleton
MyAppRequestFactory provideMyAppRequestFactory(EventBus eventBus) {
MyAppRequestFactory requestFactory =
GWT.create(MyAppRequestFactory.class);
requestFactory.initialize(eventBus);
return requestFactory;
}
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