@PostContextCreate
void postContextCreate(final IEventBroker eventBroker, final EPartService partService) {

		eventBroker.subscribe(UIEvents.UILifeCycle.APP_STARTUP_COMPLETE,
				new EventHandler() {
					@Override
					public void handleEvent(Event event) {
						partService.showPart(
								"myapp.part.statistics",
								PartState.CREATE);

						eventBroker.unsubscribe(this);
					}
				});

	}

@Inject
EPartService partService; // InjectionException

void postContextCreate(final IEventBroker eventBroker) {
...
partService.showPart(...);
...}

@PostContextCreate
void postContextCreate( EPartService epartservice, IEclipseContext ieclipsecontext ) {
if( epartservice ==null ){ // it is in fact alwasy null so it is confirmed what Johannes said
  epartservice = ieclipsecontext.get(EPartService.class);
 // OR SAME Result with: epartservice = (EPartService) ieclipsecontext.get(EPartService.class.getName());
}
// epartservice is still null

Any help here please?

class A{
@Inject EPartService _partservice;

  void method(){
    ...
    MPart mpart = _epartservice.findPart("aa.bb.cc.mypart");
    _epartservice.showPart(mpart, PartState.ACTIVATE); // _epartservice is null
    ...

  }//- method
}//- class A