Question

I need to know how can I set Hibernate (…) to achieve the following issue:

I have a bidirectional (composition) one-to-many association (a.bs is a Set object and b.a is a A object). When I load “a” from DB and I update one of its “bs” I need Hiernate intercept A entity when saveOrUpdate A.

Code:

public class A {
   Set<B> bs = new HashSet<B>();
   // ... other fields and setters/getters
}
public class B {
   A a = null;
   // ... other fields and setters/getters
}

Use case:

A a = load("idA"); // load A from DB
B b = s.getBById("idB"); // get a B element of A
b.setName("blablabla"); // update a field of B
saveOrUpdate(a); // persist A entity with its Bs (including modified B)

The change is performed because the (mini)model has been annotated properly.

The problem is that my interceptor only detects the change in B entity, but not A. I need to detect A change because I need to update audit info.

Other point of view is: I need to get A entity via B and update it. In fact, I can get A from B, but the change is not persisted…

Simplifying the question:
I have to modify A entity (set a date) when my interceptor intercepts B entity. It worksfine in onSave but not in onFlushDirty. Why?

This is:
When B is updated, is intercepted (onFlushDirty). The body of onFlushDirty method, among other things, do this:

b.getA().setLastModifyDate(new Date());

So, in that moment, A entity , that is attached to session, should became dirty, hence it should raise an interception action… I mean, the onFlushDirty method should be called again, his time for A entity. Am I wrong?
But, in any case, A.lastModifyDate should be updated… and this is not happening!!!

Following I show the actual behaviour of my application:

1. I create an A object
2. I create a B object and I associate it to A

3. I persist A => A.lastModifyDate is the correct date (OK)

4. I create an A object

5. I create a B object and I associate it to A
6. I persist A => A.lastModifyDate is the correct date (OK)

7. I load the B object, I update it and I persist B -> A.lastModifyDate is the correct date (OK)

8. I create an A object

9. I create a B object and I associate it to A
10. I persist A => A.lastModifyDate is the correct date (OK)

11. I load A object, I update its B object and I persist A -> A.lastModifyDate is not the correct date (KO)

12. I create an A object

13. I create a B object and I associate it to A
14. I persist A => A.lastModifyDate is the correct date (OK)

15. I load A object, I update any A’s field and also its B object and I persist A -> A.lastModifyDate is not the correct date (KO)

16. I create an A object and I persist it.

17. I load A object, I associate to it a new B object and I persist A => A.lastModifyDate is the correct date (OK)

18. I create an A object and I persist it.

19. I load A object, I update any A’s field, I associate to it a new B object and I persist A => A.lastModifyDate is the correct date (OK)

Any idea?

Thanks!

Answer 1

You have to use onCollectionUpdate to solve the issue