I have entity A that contains foreign key A.bpk to entity B that have primary key B.bpk. When I define in hibernate for class A many-to-one association to class B (using A.getB() ), I am not able to work with A.bpk, because I have only class reference to B.

But I need in some cases to work directly with A.bpk (load from db and persist to db without loading all B class and setting B class)

Is it posible with hibernate?
It is very important for me.

Thanks

calling a.getB().getId() does not initialize the proxy for the B.

f.e. from client a would like to send updated object A (where foreign key was changed) to server (session bean - via webservices). I receive in session bean object A with new value A.bpk (as well other fields with new values). How can I persist this A object via hibernate to db?