[jboss-user] [EJB 3.0] - Re: Problem with containment interacting with inheritance?
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Sun Jul 16 09:54:10 EDT 2006
I have gotten the original concept (i.e., Planet is a Geopolitical Unit, Country is a Geopolitical Unit, Planet contains collection of Countries) to work. Two things that caused me problems in coming up with a solution empirically:
- Having a subclass entity that is serializable of a base entity class that is not. Entities supposedly don't have to be serializable (Burke et al., Enterprise Java Beans 3.0, p. 52), but I have not tried going back and tried making them all non-serializable;
- Not having an empty constructor at each level; I do not remember reading that this as a requirement of entity POJOs in Burke et al., but it is certainly not in the index!!!
The code I wound up with does not look especially like my original posting, since I proceeded by getting one small piece working right, and then building on it incrementally, rather than trying to figure out what was wrong with what I had done originally.
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