Yeah, I am not going to install WebLogic to test this. If this is truly a problem with Hibernate you should be able to (more or less) easily reproduce this without WebLogic nor Spring in the mix.

In fact we already have tests using JBossTS/Arjuna in a standalone config for JTA integration testing. I'd suggest starting with those and trying to recreate what you see. See org.hibernate.testing.jta.TestingJtaPlatformImpl from hibernate-testing