I have a class A, with a Set of references to class B (using lazy initialization) In Session X, I get dataobject a (class A). Then, session X is closed. Later I open a new Session Y, and I try to iterate the references to class B in dataobject a. Lazy initialization exception (no session or session closed) throw.

I would like to ask, in previous example, does it means that I cannot iterate other objects from object a (with lazy initialization) in another session? If it is the case, if the object a has to be used for long time, (while the session is short-lived), i can't use lazy initialization? (since when I iterates other objects from object a, the session retrieving object a previously may have been closed). Or any suggestion or workaround?

I'm using hibernate version 2.0.3

You have to reattach the object (session.lock(myObject, LockMode.NONE)
I'm not sure this API exists in 2.0.3, so you can use session.update(myObject).