"odigokid" wrote : | I am now getting this NoClassDef Exception when I can clearly see that the class is located in the spring-core.jar file that is in the server/default/lib folder and is also located in the jboss-spring.deployer package that is in the deploy directory. Keep just one version of spring-core.jar. Probably the one in server/default/lib - if your app uses Spring outside spring-deployer notion. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4159769#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...