Did you do any changes to your server configurations? On a clean JBossAS-5.0 GA, the application that you uploaded HelloWorld.ear deploys without any issues (after fixing the web.xml dtd issue) : | | 20:16:33,498 INFO [EjbDeployer] installing bean: ejb/HelloWorld.jar#HelloWorld,uid33419270 | 20:16:33,499 INFO [EjbDeployer] with dependencies: | 20:16:33,499 INFO [EjbDeployer] and supplies: | 20:16:33,499 INFO [EjbDeployer] jndi:HelloWorld/HelloWorld | 20:16:33,499 INFO [EjbDeployer] jndi:HelloWorld | 20:16:33,641 INFO [TomcatDeployment] deploy, ctxPath=/HelloWorld, vfsUrl=HelloWorld.ear/HelloWorld.war | 20:16:33,768 INFO [EjbModule] Deploying HelloWorld | 20:16:33,797 WARN [EjbModule] EJB configured to bypass security. Please verify if this is intended. Bean=HelloWorld Deployment=vfszip:/somepath/jboss-5.0.0.GA/server/default/deploy/HelloWorld.ear/HelloWorld.jar | 20:16:33,893 INFO [ProxyFactory] Bound EJB Home 'HelloWorld' to jndi 'HelloWorld' Your expection stacktrace shows that this is being identified as a EJB3 application (which it is not). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4202890#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...