Question

I observed some strange behavior regarding injecting EntityManager.

Following is stripped down version of working code:

Bean.java

@RequestScoped
@Named
public class Bean {

    @Inject
    private Service service; // +getter

    // few variables + getters/setters

    public String getMessage() {
        return getService().message();
    }

}

Service.java

@Stateless
@LocalBean
public class Service {

    @PersistenceContext
    private EntityManager entityManager; // +getter

    public String message() {
        return "[" + getEntityManager() + "]";
    }

}

cdi.xhtml

<h:body>
    <h:outputText value="#{bean.message}" />
</h:body>

But I needed to do some processing, while creating Service. So added following producer method, in factory class.

    @Produces
    @QService
    public Service createService() {
        Service service;

        service = new Service();
        // Some processing
        return service;
    }

and added same qualifier QService at injection point in class Bean.

    @Inject
    @QService
    private Service service; // +getter

Now, EntityManager is NOT injected in class Service, it remains null.

I’m not able to understand this behavior. Can someone explain this?

Answer 1

I think the problem is this line:

service = new Service();

Since Service is an EJB it’s lifecycle is managed by the container. You are allowed to call new but I guess you will not get an EJB but a pure java class.

Try to inject the Service EJB instead of creating a new instance.