"linvicch" wrote : urhmm i thought netbean handles that when u clean and built the project | the jars have been added to the project libraries | | in the library node of the project i have | jbossall-client.jar | EJBModule30-dist/EJBModule30.jar | JDK 1.6 (Default) | JBoss linvicch, I am not familiar with NetBeans IDE so wont be able to comment on what's the right way to get this working in NetBeans. On a different note, i would suggest using JDK1.5 instead of JDK 1.6 for JBoss (this may not have anything to do with the exception you are seeing). JBoss doesnt officially support JDK6 yet. Can you post the output of the following: - From the command prompt go to C:/blah/blah (the folder which contains your application's client jar) - Run the following command jar -tf test.jar where test.jar is the name of the client jar file. Post the output here. Also post the contents of the MANIFEST.MF file present in the test.jar. Assuming that the test.jar is present in C:\blah\blah folder, where are the jbossall-client.jar and EJBModule30.jar files located? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4103957#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...