I am looking at using Seam 2.0 for my next project, but currently we have another project using Seam 1.2 deployed to our JBoss 4.0.5. If I change the JBoss 4.0.5 JSF implementation from myfaces to JSF 1.2 RI as indicated in the documentation, will this break the existing Seam 1.2 deployed applications? Referenced Documentation: http://docs.jboss.com/seam/2.0.0.GA/reference/en/html/gettingstarted.html... Would it be better to upgrade my existing projects from 1.2 to 2.0? Should I also upgrade from JBoss 4.0.5 (EJB3) to 4.2? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110368#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...