I tried changing the jgroups version. Currently I am using 2.2.9 version. The earlier problem has been resolved. Now I am getting the following problem: 11:27:58,298 ERROR [RpcDispatcher] exception=java.lang.IllegalArgumentException: Marshaller.extractFqn(): Unknown method call id: -1 11:27:58,298 INFO [TxInterceptor] There was a problem handling this request java.io.NotSerializableException: RpcDispatcher returned a null. This is most often caused by args for _clusteredGet(_getDat a(/__JBossInternal__/__RefMap__), false) not being serializable. I am using the ClusteredCacheLoader for my application. The error tends to come when the changes are being replicated to the other machine in the cluster. Any help in this regard will be appreciated. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4011149#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...