I am trying to automatically re-hash data when saved to the database using JPA.
The idea is that I have an entity that contains a list of other entities.

A has a reference to a @OneToMany "List<B> myBList"

B => has a @ManyToOne "A a"

B‘s hashs are based only on the entity’s data.

A‘s hash is based on the entity’s data and the hash of the list of B‘s

If any B is modified or created and added to A, I want to rehash the value of A.

However, in my PreInsert or PreUpdateEvent listener do not register any call to entityManager.save(a) or event.getSession().save(a).

B hash is properly modified by changing the Object[] state, but using b.getA(), modifying A and saving it does not work.

I am starting to wonder if that is even possible to do inside of event listeners.