Dear all I am running JBoss Application Server 4.3.0 and Log4j-1.2.15 for my application. every times I reload my application by modifying the web.xml My application is down. looking for in the server.log file i get the error message: "log4j:ERROR LogMananger.repositorySelector was null likely due to error in class reloading, using NOPLoggerRepository" although the application reloads well but every times I access my web pages that use a Log4j object I get the an error message and the Log4j object always return null object! I also study this problem on some links such as https://issues.apache.org/bugzilla/show_bug.cgi?id=40212 http://www.nabble.com/Stop-tomcat-app:-grails-jars-still-locked,-cannot-r... but I could not solve the problem. if you have experience with this problem, please help me to solve it. Thanks in advance! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4203844#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...