I'm on the learning curve when it comes to using EJB 3.0 inside a JBoss EJB container. I have developed all my entity beans and can persist them successfully with JPA annotations outside an EJB container (using Hibernate only) without a problem. it is only when I am migrating to JBoss that I am having problems: 1.) I have an Entity which has several Lists as fields that get persisted. 2.) I have a stateful session bean (SFSB) which has the entityManager annotated with @PersistenceContext(unitName = "myPU", type=PersistenceContextType.EXTENDED) and this works great to persist an entity and immediately retrieve it in the same method. Without this annotation, retrieving the Entity will throw this exception: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: MyEntityClass, no session or session was closed 3.) I can persist the Entity and immediately retrieve it in the same method. However, if I keep JBoss running, and restart the VM and retrieve the Entity with the exact same SFSB again, the exception in bullet 2 above is thrown. (BTW, Setting to EAGER loading isn't an option for my requirements.) It seems that the entityManager session is being closed in one way or another, despite the inclusion of the annotation in bullet 2 above. I'm not clear as to if this should happen or not. I am assuming that a stateful session bean should be able to hold open a JPA entityManager session indefinitely. Is this a good assumption? Also, looking at the JBoss server.log, I am seeing that my SFSB is being passivated. How is the entityManager session supposed to progress through passivation? I would expect it wouldn't. After activation, am I supposed to somehow restore the entityManager session? Thanks in advance for any tip or hints to get me going. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4009162#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...