Look at the manifest in the jar file: ... Implementation-Title: log4j Implementation-Version: 1.2.8 ... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3981859#3981859 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3981859