Hibernate 2.1.4

I have an object 'A' which has a child object 'B' that is defined as a property. 'B' has a collection 'C' that is defined as lazy

I retrieve 'A' from a hibernate session, and the session is closed and 'A' "goes off and does some stuff"

Later 'A' is reattached to a "new" session with session.lock(A, LockMode.NONE) and I do 'B = A.getB()' and all is well

I then call 'B.getC()' and I get LazyInitializationException with "no session or disconnected session"

If I do session.lock(B, LockMode.NONE); after calling 'A.getB()' then I can call 'B.getC()' with no errors

I understood that if the parent object is reassociated with a session, so should the whole object graph? What am I missing?

I'm not modifying 'A' in between getting it from the session and calling 'A.getB()' on it

Depends on the cascade attribute. Lock only cascades across save-update (or "higher").