Another self-contained, minimalistic test case for this can be found here: https://github.com/smaragd/order-test
It has only two entity beans and a session EJB that deploys fine under Hibernate 4.3.0.Beta4 (as used in WildFly 8.0.0.Beta2), but breaks under Hibernate 4.3.1.Final (as used in the GA release of WildFly). I have tried all tagged versions of Hibernate up to 4.3.4.Final but they all show the same problem.