I found out that when removing the JBOSS 404 EJB3 libraries from the classpath, then the embedded server started successfully. However, I was thinking it would be better to use the RC8 version together with JBOSS 4.0.4 - do you know where I can download this version? Do you see any conflicts in using ALPHA_8 to unittest, using JUnit, a application which is ment for deploy on JBOSS 404? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964464#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...