I'm having the same problem. Have you solved it?
Ok, I found it: just needed to upgrade hibernate3.jar from the 3.0.5 to the 3.1 version. Now everything works fine.
It's there at the jBPM user guide, chapter 5, section 5.3:
jBPM is distributed with hibernate 3.1 final. But it can also work with 3.0.x. In that case, you might have to update a few hibernate queries in the hibernate.queries.hbm.xml configuration file.
Thanks for the solution.I didn't try it yet.Will do that today.
Thanks so much again,for the reply.