Can a Session Bean implement additional interface in addition to SB Interface?

Question

I have a Session Bean like this:

@Stateless
@Local(MySessionBeanInterface.class)
public class MySessionBean implements MySessionBeanInterface {

}

I wanted to know if its okay to implement another interface as well. For instance, I have interface called, MyXYXInterface. I want the above bean to implement this as well.

@Stateless
@Local(MySessionBeanInterface.class)
public class MySessionBean implements MySessionBeanInterface, MyXYZInterface {

}

So, in the context of EJB's / Session Beans, is it a bad thing? does it interfere with treatment of EJBs in the container?

Answer 1

There are no problems with implementing additional interfaces in addition to EJB so long as you use @Local explicitly (either on the EJB or on one of the interfaces on the implements clause). If you don't use @Local, then the EJB container will "infer" the local interface, and if you add additional interfaces to the implements clause, that will cause problems.