You are right that's the problem, I found this also at 
http://www.hibernate.org/hib_docs/v3/reference/en-US/html/persistent-classes-equalshashcode.html
http://www.hibernate.org/hib_docs/v3/reference/en-US/html/persistent-classes-equalshashcode.html
 

So each entity should have modeled at least one attribute that is a natural
key or all attributes together should build the natural key.

Thanks a lot, that was a very important fact for me.


Patrik Nordwall wrote:
> 
> How do you implement hashCode?
> Consider the case when the object is placed in a Map before it is
> persisted and then it is persisted. hashCode should not change.
> 
> /Patrik
> 


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