I have an application EAR package that deployed in a JBoss4.0.5GA server, the EAR have lots of EJB2.1 style beans and a WAR. Now I need to call a remote EJB3 style bean in another JBoss4.2.1GA server. My JNDI configuration is: java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory | java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces | java.naming.provider.url=10.100.x.x But when it invoke lookup(), cause exceptions: javax.naming.CommunicationException [Root exception is java.io.InvalidClassException: org.jboss.remoting.InvokerLocator; local class incompatible: stream classdesc serialVersionUID = -4977622166779282521, local class serialVersionUID = -2909329895029296248] | at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:722) | at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587) | at javax.naming.InitialContext.lookup(InitialContext.java:351) | at com.xued.ejb3.ejb.SSOBeanClient.main(SSOBeanClient.java:15) | Caused by: java.io.InvalidClassException: org.jboss.remoting.InvokerLocator; local class incompatible: stream classdesc serialVersionUID = -4977622166779282521, local class serialVersionUID = -2909329895029296248 | at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:546) | at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552) | at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908) | at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908) | at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) | at java.rmi.MarshalledObject.get(MarshalledObject.java:135) | at org.jnp.interfaces.MarshalledValuePair.get(MarshalledValuePair.java:72) | at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:652) | ... 3 more But when I use jbossall-client.jar in JBoss4.2.1GA to run a client program with the same code, it is nomal. I try to copy the jbossall-client.jar from JBoss4.2.1GA in my EAR directory, and make this jar in ejb jar class path, but the default ClassLoader doesn't load this jar. So I modified the jboss-app.xml, use HeirarchicalLoaderRepository3 to load local jar file first, as this: <?xml version="1.0" encoding="UTF-8"?> | <jboss-app> | <loader-repository loaderRepositoryClass='org.jboss.mx.loading.HeirarchicalLoaderRepository3'> | sso:loader=sso.ear | <loader-repository-config configParserClass='org.jboss.mx.loading.HeirarchicalLoaderRepository3ConfigParser'> | java2ParentDelegaton=true | </loader-repository-config> | </loader-repository> | </jboss-app> Then the situation even get worse, the EJB2.1 beans deploy failed! WARN [ServiceController] Problem creating service jboss.j2ee:jndiN | ame=ejb/AsyncSender,service=EJB | java.lang.ClassCastException: $Proxy70 | at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.getEJBLocalHome(Bas | eLocalProxyFactory.java:243) | at org.jboss.ejb.Container.createService(Container.java:803) | at org.jboss.ejb.SessionContainer.createService(SessionContainer.java:16 | 0) | at org.jboss.system.ServiceMBeanSupport.jbossInternalCreate(ServiceMBean | Support.java:260) | at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMB | eanSupport.java:243) | at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces | sorImpl.java:25) | at java.lang.reflect.Method.invoke(Method.java:585) | at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch | er.java:155) | at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) | at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker. | java:264) | at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) | at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceControl | ler.java:978) | at $Proxy0.create(Unknown Source) | at org.jboss.system.ServiceController.create(ServiceController.java:330) | ... So, is there any way to call Jboss 4.2.1GA EJB3 bean from a JBoss 4.0.5GA EAR application? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4078994#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...