How does CDI remove stateful session bean?

Question

The spec says that CDI container removes a SFSB when the scope's context is about to be destroyed. How does it exactly remove the EJB? It does not seem to be calling the method annotated with @Remove.

@Stateful
public class CustomerDAOImpl implements CustomerDAO {
    @PreDestroy
    public void onDestroy() {
        //This is getting called as expected
    }
    @Remove
    public void deleteMyBean() {
        //This is not getting called!
    }
}

So, CDI is technically doing what the spec says. The question is how is it managing to ask the EJB container to remove the instance? Thanks.

Answer 1

I think the CDI container needs a hook into the EJB container to ask it to "do what you'd do if an @Remove method had just completed". Looking at EJB spec, EJB 2.1 had a mechanism for this in the interfaces you had to extend.

For obvious reasons, the container calling an arbitrary @Remove annotated method for the side effect is pretty ill advised.

Answer 2

As covener says this is done using an implementation specific EJB API, that isn't part of the EJB standard API.

As covener says, calling @Remove is NOT the right way to proceed. @Remove methods are called by users code, and tell the EJB container to remove the EJB. If you want a callback when the EJB is removed, use @PreDestroy.