EJB cannot inject other EJB

Question

I do have a EJB ActionService which I can inject into other EJBs, that is working fine.

Now I created another EJB:

@Stateless
public class ActionsPerDateDataSet extends ScriptedDataSetEventAdapter  {       
    @EJB
    ActionService actionService;

@Override
public void open(IDataSetInstance dataSet) {
        actionService.foo() // However actionService is null here!
    }
}

Where the ScriptedDataSetEventAdapter comes from another framework (BIRT). However now my actionService is always null. I can not understand why

Answer 1

It is possible that the class ScriptedDataSetEventAdapter can not be initialized in the EJB Container (First part of the cycle) and as the initialization is not correct, the dependency injection (@EJB and @Inject) is not made.

What you could do is change the Design of your EJB and instead it's extends "ScriptedDataSetEventAdapter" change it to a composition.

@Stateless
public class ActionsPerDateDataSet   {       

    ScriptedDataSetEventAdapter scriptedDataSetEventAdapter;

    @EJB
    ActionService actionService;

    @PostConstruct
    public void init (){
        try {
            scriptedDataSetEventAdapter = new ScriptedDataSetEventAdapter();
        } catch( AppException e){
        }
    }

@Override
public void open(IDataSetInstance dataSet) {
        actionService.foo() // However actionService is null here!
    }
}

Answer 2

You should introduce the lib as ejbModule in ear file , so that container search the jar file and deploy it and inject it whenever it needs