JBoss 4.0.4 GA Patch 1, ejb3-clustered from .jar installer I have a hierarchy of entities using JOINED inheritance, the hierarchy is: Structure -> House -> Apartment (Structure is the root of the hierarchy flagged with @Inheritance attribute, the others extend Structure and provide @DiscriminatorValue's ) I have @OneToMany lazy loading from another bean to get all of the "Structure"s that are associated with it, and the method returns all of the Structure's (House and/or Apartments), but the returned objects cannot be cast to their appropriate type. IE: List< Structure > structures = myBlock.getStructures(); for( Structure structure : structures ) { if ( structure instanceof House ) { ... } // this is always false if ( structure instanceof Apartment ) { ... } // this is always false } and deliberately casting to a sub-type via: ((House)structure).doSomething() throws a class cast exception, even though the entity in question is discriminated as a House. I've tried both javassist and cglib byte enhancers, both produce the ClassCastException So is this a bug? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964512#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...