Hi All,

Having a fairly complex object graph and a J2EE client-server with Hibernate coupled only to the J2EE server; the DTOs are passed in the RMI (session bean) calls.

The problem is that if I want to change some collection for say, object A and call via RMI the session bean then somehow I need to pass back to the client (as return object(s)) the modified IDs, in case I added a new member to the collection. Otherwise my client will not operate properly on the newly changed collection of A.

I can return the entire container for the collection but this is expensive. Or, I can just return the changed IDs, but this is quite cumbersome.

Another way would be to assign IDs on the client side, but we would go with auto-generated IDs.

Please advice.

TIA,

--steve p.

You're talking about two steps:

create new entity and assign ID
add entity to collection

You could create and add the new entities first (have a special session bean, just to add new entities, that returns the the entities with IDs filled in).

Then add them to the collection. Once they're added, they've already got their ID's and they behave properly.

You would need to start the transaction on the client to make all this happen atomically, but that's not too hard.