Hibernate version: 2.1.4

I just want to find out if anyone has come across this behaviour.

I have a J2EE app running on WebSphere 5.0.2 and database is
DB2 UDB 8.1.3.

The app works without issues in the following environment:
- app & db servers both on Windows.
- app & db servers both on Linux.
- app on Solaris 8 & db on Windows.

But when I deploy the db on my Solaris machine.
I get a ClassCastException on a java.lang.Boolean object.

This baffles me because the same thing works in the first three instance.

Also, I noticed the datasource refused to work if I did not include my db2profile of my DB2 instance when starting my app server.

Would be grateful for solutions/ideas on how to overcome this.