Thanks peterj , for the reply. Actually i am using eclipse Infocenter .WAR and there are minimal number of jars which are required to run this application and one of the jar used is org.apache.commons.logging_1.0.4.v20080605-1930.jar. If i am removing this jar from the app ,the application is not running even on jboss 4.0.4. As per your reply , I tried removing the jar from the application and then tried running it on jboss 4.4.2 GA . the error which is comming up is HTTP Status 404 - ProxyServlet: /help/ -------------------------------------------------------------------------------- type Status report message ProxyServlet: /help/ description The requested resource (ProxyServlet: /help/) is not available. -------------------------------------------------------------------------------- and when removing commons jar from application and adding the commons jar of jboss 4.2.2 in tha application the error pasted above is not comming but , the trace comming up is similar to the one posted in my last post. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4209343#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...