My EntityManager is injected to my session scoped and I have 3 methods: | @PersistenceContext(type = EXTENDED) | private EntityManager em; | | public String list(){ | ... | } | | public String edit(){ | ... | } | | public String save(){ | ... | } | In list method, I retrieve a collection of data from db. in edit(), I start to edit for a single entity. in save(), when I try to use em.persist(myentity) or em.merge(myentity). I get java.lang.IllegalArgumentException: Entity not managed. If I change my ejb to conversation scoped, the problem would disappear. Any idea? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4007218#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...