Is it hibernate stable (2.1.3) (With OSCache)?

I have a little project that only manage one table but it is used by a lot of users (More than 1000 users).

The project will browse a row in table, then submit. During submit, application will delete that row and then insert one with new data.

In some time, hibernate reported duplicate key when insert. It isn't allways happens but it happens many times.

It isn't because delete and insert, if I use saveAndUpdate, more error (Duplicate) occured.

Is it a way to overcome? Or because of OSCACHE?

Danny Chen