Just guessing I bet that the 2 JVMs return the methods in different order via reflection. We have seen similar changes in previous JVM releases. More than likely the trouble manifests inside org.hibernate.internal.util.ReflectHelper#getGetterOrNull could you step into that method and see where it breaks down?

Yes, Hibernate should verify the return type when deciding between the possible matches. But really you can see why this is just asking for trouble