I've been trying to test EJB3 clustering performance on JBoss AS 4.0.5.GA using a small demo application. The application works correctly under a single instance of jboss using the "all" configuration. If, however, I start up a second instance of jboss after having executed an order on the first instance, I get a ClassNotFoundException during startup. I have been able to bypass this issue by copying my classes into the lib directory, but this is not a very workable solution. Any suggestions? The stack trace I'm seeing is below: java.lang.ClassNotFoundException: No ClassLoaders found for: services.entities.ProductDemandPK | at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212) | at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:511) | at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:405) | at java.lang.ClassLoader.loadClass(ClassLoader.java:251) | at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) | at java.lang.Class.forName0(Native Method) | at java.lang.Class.forName(Class.java:242) | at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:585) | at org.jboss.invocation.MarshalledValueInputStream.resolveClass(MarshalledValueInputStream.java:109) | at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1544) | 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.readObject(ObjectInputStream.java:348) | at org.jboss.cache.Fqn.readExternal(Fqn.java:355) | at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) | at org.jboss.cache.loader.NodeData.readExternal(NodeData.java:59) | at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateStateTransferChildren(StateTransferIntegrator_140.java:241) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateStateTransferChildren(StateTransferIntegrator_140.java:271) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateStateTransferChildren(StateTransferIntegrator_140.java:271) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateStateTransferChildren(StateTransferIntegrator_140.java:271) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateTransientState(StateTransferIntegrator_140.java:222) | at org.jboss.cache.statetransfer.StateTransferIntegrator_140.integrateTransientState(StateTransferIntegrator_140.java:97) | at org.jboss.cache.TreeCache._setState(TreeCache.java:2640) | at org.jboss.cache.TreeCache.access$000(TreeCache.java:86) | at org.jboss.cache.TreeCache$MessageListenerAdaptor.setState(TreeCache.java:5306) | at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.passUp(MessageDispatcher.java:614) | at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:331) | at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.handleUp(MessageDispatcher.java:722) | at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.access$300(MessageDispatcher.java:554) | at org.jgroups.blocks.MessageDispatcher$1.run(MessageDispatcher.java:691) | at java.lang.Thread.run(Thread.java:595) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979224#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...