Thanks for the answer. For me it is acceptable to unit tests some EJB 3 with Jboss microcontainer even if I deploy in JBoss AS 4.2.3. For unit tests I just use basic EJB3 features. I also have integration tests in JBoss AS. I have tried embedded JBoss beta 3 with JDK 1.6 using the magic jvm arguments (http://www.jboss.com/index.html?module=bb&op=viewtopic&t=132549) That works fine ... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4167582#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...