Very good, Sandello. I had this problem, I removed log4j.jar from my application on Jboss and it startup without problem. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4069339#4069339 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4069339