Hibernate version:2.16

We have the following structure:

A message driven bean receives a JMS message with an ID number on it.

The MDB uses that ID number to load up an instance using hibernate, then changes a few values on the instance.

The MDB then calls a method on a session bean to (amongst other things) save the instance, passing the above instance as a parameter.

The save fails due to a non-unique object exception.

Quick question - am I getting this because due to the fact the EJB call has to serialize and unserialize the objects, i.e. its passing in a copy of the instance not a copy of the reference to the instance as in a usual method call ?

For the record this was the problem, and the solution is to call the session bean via the local reference not the remote one.

Fixing the design would hav ebeen a better one, but we are in a transitional phase between EJB/JDBC and hibernate, so its not currently practical or expedient.