Hi, I'm continuing to try to solve the problem with IdClass annotation. The problem is that when I get value of annotation with this code: AnnotationSource<JavaClassSource> idClassAnotation = entityClass .getAnnotation(IdClass.class); String valueClassName = idClassAnotation.getLiteralValue(); I get "className.class". There is no info about package. Also Class Loader facet has no access to classes defined in the project. Only to external classes. At least I was not able to load for example Entity class. If I had access to entity class from class loader I can get annotation from class definition and get it's value. Also I need to test primary key class that it implements java.io.Serializable. Any suggestion where to look for sample how to solve all the problems mentioned above? thanks in advance. -- Doychin Bondzhev dSoft-Bulgaria Ltd. PowerPro - billing & provisioning solution for Service providers PowerStor - Warehouse & POS http://www.dsoft-bg.com/ Mobile: +359888243116