EntityManager.contains unsupport Entity enhanced by CGLIB --------------------------------------------------------- Key: JPA-22 URL: http://opensource.atlassian.com/projects/hibernate/browse/JPA-22 Project: Java Persistence API Issue Type: Bug Affects Versions: 1.0.1 Reporter: vangie du invoke contains() method with a entity enhanced by CGLIB while throw IllegalArgumentException. other methods like persit() remove() can config the hibernate interceptor by override the getEntityName(). public class UnByteCodeProxyInterceptor extends EmptyInterceptor { private static final long serialVersionUID = -6422637558312349795L; @Override public String getEntityName(Object object) { if (object != null) { Class<?> cl = object.getClass(); if (ProxyBeanUtils.isProxy(cl)) { cl = cl.getSuperclass(); } return cl.getName(); } else { return null; } } } but the contains() not invoke the entityNameResolver to get Entity name. statement in org.hibernate.ejb.AbstractEntityManagerImpl.contains() getSession().getSessionFactory().getClassMetadata( entity.getClass() ) change to getSession().getSessionFactory().getClassMetadata( ((SessionImplementor)getSession()).bestGuessEntityName(entity) ) can workaround this problem. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira