After switching our project from 4.2.7.SP1 to 4.2.8.Final, we have got java.lang.ClassCastException: ru....Vendor_$$_javassist_9 cannot be cast to javassist.util.proxy.Proxy
We are re-check environment and downgrade hibernate version to 4.1.12.Final - all seems work fine. The same for 4.2.7.SP1.
We are using runtime bytecode transformation (javassist 1.18.1-GA) and hbm-based mapping behind JPA.
Windows 2008 Server, Java 7u13 x64, Glassfish 126.96.36.199