Hi,

I am using hibernate3 to manage my relational persistence, and it is working great. I have one problem however:

I create a parent object. When I restart my application its child sets are created lazily without a problem. When, in the same session, I try to add a newly created child to it, I get a NullPointerException. It seems that the PersistentSet to hold the child references are only created when restarting the application. Is there a way to tell hibernate to create the sets right after creating the parent Object? In the database the child is linked to the arent, it is only in the hibernate that there is a problem. Even refreshing the parent does not help.

A working workaround is to create a Query "from Parent where Id = :newid". and put that in the session cache.

Any solutions on that one?

Regards,
Leen Toelen

Can you please post the exception and possibly an isolated example?

I'd guess that your object doesn't create a set implementation when it needs to. But... I can't tell because you didn't post an example. :)

Also: Session.load() or Session.get() should be used instead of "from Parent where Id = :newid" if Id is the key. Since you didn't post mappings, I can't tell. :)

Anyway, if you really want a solution you need to describe the problem more fully, thanks!

Hi,

I solved the problem by doing

session.refresh(parent);
parent.getChildren.add(child);

This always creates the children PersistentSet, even if parent has only been just created.

Best regards,

Leen Toelen
http://www.peakadilly.com