[jboss-user] [EJB 3.0] - Re: Merging an extended class from existing superclass

[waynebaylor]

I think there is a conceptual issue here. What you are trying is analogous to casting a Dog object to a SpottedDog object, which is bad--a Dog is not always a SpottedDog.

I suggest you remove the existing Dog object, then save the SpottedDog object. 

For example:
Dog d = em.find(Dog.class, ID);
  | SpottedDog sd = new SpottedDog(d);
  | sd.set*(...);
  | ...
  | em.remove(d);
  | em.persist(sd); //you could also use em.merge(sd) here


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