Thanks Jaikiran for yr references...I was somehow able to resolve the problem. Initially all i did was to create an entity bean and a web client that would call my entity bean. Then i had created a EAR containing the war and Jar files and deployed it on the server. Everything seemed to be right but i was getting the Exception mentioned above. Later i saw in one of the forums to change a configuration file in directory C:\jboss-4.0.4.GA\jboss-4.0.4.GA\server\default\deploy\jbossweb-tomcat55.sar\META-INF\jboss-service.xml In the file there is an attribute by the name "UseJBossWebLoader". When i set this attribute to true then everything seems to work alright... I still couldn't understand both the problem and the solution :). Do u have any explanations for this? Meanwhile i shall go thru the references that u have sent for any answers that i cud get... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135126#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...