Which one to use ? Since both are stable now, which one should i use ? I'm developing my second J2EE-Application on JBoss and i'm using JBoss 2.4.x at the moment, which has all the features I need. What about Performance ? Does 3.0 have a better Performance ? (Or only if i use more EJB 2.0 features?) Can I deploy my app that runs fine on 2.4.x whithout modification ? Any disadvantages if I use 3.0 ? Any advantages using 3.0 for an application that runs on 2.4 ?