Friends,

I have a rather common pure-Java scenario which I would like to know is possible in EJBs.

I have the below class hierarchy :

InterfaceA

AbstractA implements InterfaceA

MyEntityBeanA extends AbstractA implements EntityBean

and correspondingly :

InterfaceB

MyEntityBeanB implements EntityBean, InterfaceB

Now, MyEntityBeanA and MyEntityBeanB are related beans (CMR) . Now I have some generic behaviour in AbstractA which depends on the implementation of the methods of InterfaceB in MyEntityBeanB.

To clarify, InterfaceB may look as below :

public interface InterfaceB {
 public String getName();
}

and AbstractA may look as below

public abstract AbstractA implements InterfaceA {
 public abstract Collection getAllRelatedBeans(); // to be implemented by sub-class

 public void justPrintAll() {
 Iterator i = getAllRelatedBeans().iterator();

 while(i.hasNext()) {
 InterfaceB interfaceB = (InterfaceB) i.next();
 interfaceB.getName();
 }
}

The InterfaceB casting obviously fails because what we have in the Collection are the Local interfaces for the MyEntityBeanB bean.

My query is - is this type of inheritance and abstraction possible in entity beans ? Is there defined way in which I can make it work ? Any suggestions/recommendations would be most welcome.

Thanks.