Hi,

I'm new to EJB development and currently search for the best/correct way to handle events between two EJB-JARs which are in one EAR.

I tried to use the Observer Pattern. The event gets fired in BeanA but does not reach BeanB (as stated, two different EJB-JARs = two different Eclipse Projects in one Workspace / EAR).

My Code currently looks kind of like this:

Eclipse Project "beana"

@DependsOn("BeanB")
@Startup
@Singleton
@WebService
public class BeanA implements BeanARemote, BeanBLocal{ 

          @PersistenceContext
          private EntityManager em;

          @EJB
          private BeanA beanA;

        public void listenToReceivedEvent(@Observes ReceivedEvent events){
          Query query = em.Query("some query");
          //implementation
        }
}

Eclipse Project "beanb"

@Singleton
public class BeanB implements BeanBLocal {

          @Inject
          Event<ReceivedEvent> events;

          public void fireEvent() {
               //implementation
               ReceivedEvent e = new ReceivedEvent(stringList);
               event.fire(e);
          }
}

public class ReceivedEvent  {

          private List<String> stringList;

          public ReceivedEvent(final List<String> stringList) {
                    this.stringList= stringList;
          }


          public List<String> getStrings() {
                    return stringList;
          }
}

Currently, when on BeanB the event is fired at BeanA nothing happens. My question now is: is the Observer Pattern the correct pattern in this case? Did I forgot something in this sample why the BeanA does not gets the event? Is the Observer Pattern made for event communication between two differen EJB-JARs?

Thanks