Hi everybody,

(I'm very new to hibernate, so pls give me some credit here.)

Say I have an object P that has a list of childeren (A,B,C) in my DB.

The user clicked on P in the UI and now want to see its children.

So I fetch these objects from the database (on the server) and send them to the client (the session is closed on the server but persistent object P is kept in memory). The user deletes A and adds a new D. Next he clicks save.

On the server, can I just open a session, add the pojo D to (the persistent object, so the hibernate proxy around the real..) P and Update ? A collegae of mine says this will fail because I can not mix persistent objects and pojos. And save won't work either because P already exists. How is one to handle this ? Or are we missing something?

thanks a lot!

Best regards,
mrxjn

It should be fine as long as D is a mapped entity.



Farzad-

I'm afraid your colleage doesn't know what he is talking about.

http://www.hibernate.org/hib_docs/refer ... e-detached

explains how to modify objects that live longer than their session.

thanks for your replies!


what my collegea means is...

// in the first session
Cat cat = (Cat) firstSession.load(Cat.class, catId);

// in the second session...
Cat potentialMate = new Cat();
cat.setMate(potentialMate);
secondSession.update(cat); // update cat

that this will not work

but secondSession.merge(cat) will definitely do.



Farzad-

oki, so merge is the magical method :)

thanks a lot guys! I'll tell him on monday :)


thanks for your time!