Using JBoss AS 4.2.0 and seam 1.2.1 I did seam setup (made an ear and ask to drop create the db each time) seam new-project seam generate-entities And then when I deployed that in my generated app with ant deploy I got this: java.lang.ClassNotFoundException: org.apache.myfaces.webapp.StartupServletContextListener The myfaces jars aren't in the ear or war, and jboss 4.2 seems to be using the sun implementation. Might I conclude from this it's recommended to use jboss 5beta2 instead? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4048736#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...