How to extend spring entity objects and be able to cast.

How do I extend an existing spring 3 entity object without throwing casting exceptions? I need to add a method to a base class

The existing object is: @RooJavaBean @RooToString @RooEntity public class A {

and the child is: public class ASub extends A {

Currently I get: java.lang.ClassCastException: com.foo.A cannot be cast to com.foo.ASub

I tried adding this to context.xml:

Nothing complained on startup, but it didn't help.

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