Have you packaged a log4j.jar in your application? If so, which version of log4j? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051870#4051870 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4051870