I am facing the following error:

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session

I have the following scenario:
I have a object A1 of type ClassA which contains 2 objects:

1) B1 of type ClassB
2) A2 of type ClassA again

Now A2 contains the same instance B1 in it also.

So whenever i invoke saveOrUpdate method for A1, i get the exception saying B1 is already associated with the session.

How do i save this object graph?

Thank you.

Is there no way through which i can have same object present in a single session?

I tried out creating a new Session in the onUpdate method and saving the object(which was giving the NonUniqueObjectException) through this new session. It worked.

However, is this the right thing to do. i.e. opening a new session inside callback methods?