yes, as far as i know Hibernate will not populate the value when used with a 
composite PK. To enable that behavior you have to define some custom classes, 
etc..

anonymous wrote : We regard this as an extremely strange thing to want to do. 
If you have a generated surrogate key, why not just make it be the primary key?
  | 
  | However, if you must do this, you can do it by writing a CompositeUserType 
for the composite identifier class, and then defining a custom 
IdentifierGenerator that populates the generated value into the composite key 
class.
http://www.hibernate.org/117.html?cmd=prntdoc 
Under the question: "I have a composite key where one column holds a generated 
value...?"

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