i get the same error but i can't resolve it :( plz help my hibernate jars are the same ... error code : [CODE] Exception in thread "main" java.lang.reflect.UndeclaredThrowableException at $Proxy0.add(Unknown Source) at org.jboss.tutorial.stateless.client.Client.main(Client.java:12) Caused by: java.rmi.MarshalException: Failed to communicate. Problem during marshalling/unmarshalling; nested exception is: java.io.OptionalDataException at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:306) at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:143) at org.jboss.remoting.Client.invoke(Client.java:525) at org.jboss.remoting.Client.invoke(Client.java:488) at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:41) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88) at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:46) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88) at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:40) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:78) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:88) at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102) ... 2 more Caused by: java.io.OptionalDataException at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1310) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339) at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:128) at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66) at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:279) ... 14 more [/CODE]
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