Hi,camunda I tried your method, my application running fine! Thank you! But it's a camunda method,right? I don't know if there a official solution. Hi,mithilwane & sashaxiv & sipcity My app used jbossall-client.jar in client, so I delete "Log4jLoggerPlugin.class" in "jboss4.2.0GA/client/jbossall-client.jar". My app loggin fine! Do you use this jar? You can try it! Thanks all repliers!!! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049574#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...