I am having the same problem as Marco. I did what was suggested but unfortunately did not succeed. I updated the directories, it's ok. The file ejb3-persistence.jar can be found in different directories: jboss-4.0.4.GA\server\default\deploy\ejb3.deployer\ jboss-4.0.4.GA\client\ jboss-4.0.4.GA\server\default\lib\ Should I update on all 3 dirs? I updated in all dirs and I get the following error: ERROR [MainDeployer] Could not create deployment: HYPERLINK file:/C:/jboss-4.0.4.GA/server/default/deploy/ejb3.deployer/ file:/C:/jboss-4.0.4.GA/server/default/deploy/ejb3.deployer/ | org.jboss.deployment.DeploymentException: Trying to install an already registered mbean: jboss.remoting:type=Connector,name=DefaultEjb3Connector,handler=ejb3 | at org.jboss.system.ServiceCreator.install(ServiceCreator.java:103) | at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:449) | at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:171) | at org.jboss.system.ServiceController.install(ServiceController.java:226) | (...) | | ERROR [MainDeployer] Could not create deployment: HYPERLINK file:/C:/jboss-4.0.4.GA/server/default/deploy/jboss-aop-jdk50.deployer/ file:/C:/jboss-4.0.4.GA/server/default/deploy/jboss-aop-jdk50.deployer/ | org.jboss.deployment.DeploymentException: Trying to install an already registered mbean: jboss.aop:service=AspectManager | at org.jboss.system.ServiceCreator.install(ServiceCreator.java:103) | at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:449) | at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:171) | | (...) | at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) | at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) | at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) | at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) | at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) | at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) | at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210) | at $Proxy5.deploy(Unknown Source) | at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482) | at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362) | at org.jboss.Main.boot(Main.java:200) | at org.jboss.Main$1.run(Main.java:464) | at java.lang.Thread.run(Thread.java:595) | INFO [ServiceEndpointManager] jbossws-1.0.4.GA (date=200611151648) | Any hints? Heitor View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991311#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...