Hibernate with enabled enhancer throws error at deployment ---------------------------------------------------------- Key: WFLY-3297 URL: https://issues.jboss.org/browse/WFLY-3297 Project: WildFly Issue Type: Bug Security Level: Public(Everyone can see) Components: JPA / Hibernate Affects Versions: 8.1.0.CR1 Reporter: Markus D Assignee: Scott Marlow Labels: hibernate Attachments: verbose_log.txt When I enable the enhancer in the persistence.xml then I receive an error from javassist at deployment. https://community.jboss.org/message/871056#871056 {code:java} public class TornadoStrikeSkill extends SelfTargetSkill { private static final long serialVersionUID = 1123460060768124078L; public TornadoStrikeSkill() { } @Override protected void executeSkill() { ..... GameObjectService gameObjectService = BeanLocator.lookup(GameObjectService.class); // getting the characters from an EJB for(GameCharacter victim : gameObjectService.calculateVictims()) { } } public class GameCharacter extends GameObject { @OneToMany(mappedBy = "caster") private List<Skill> skills = new ArrayList<Skill>(); {code} When I remove the for loop the error is gone. When I deploy the same application on JBoss 7.1 it works. So I guess the classloading has changed. Maybe the cyclic dependency messes with the javassist?