Under specific circumstances I get the exception below when making a call to an EJB3 stateless session bean using JBoss 4.0.4.GA-Patch1. I debugged JBoss and found that the object passed to java.lang.reflect.Method.invoke() was not of the correct class; the method is readResolve(). The circumstances are as follows: - The bean's remote interface must be looked up from inside of the JBoss EJB container. If we use the local interface inside of the container or the remote interface from outside, everything is fine. - The deserialized graph must contain a org.geotools.referencing.crs.DefaultProjectedCRS, which contains a bunch of other Geotools objects. This behavior is reproducible 100% of the time. If necessary, I should be able to provide a standalone test case. java.lang.IllegalArgumentException: object is not an instance of declaring class at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:426) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:841) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:841) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:841) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:841) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:841) at org.jboss.serial.io.MarshalledObjectForLocalCalls.get(MarshalledObjectForLocalCalls.java:60) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:61) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102) at $Proxy150.createCoordinateReferenceSystem(Unknown Source) at com.lggi.esp.services.ejb.spatial.core.coordinatesystem.CoordinateSystemWorker.createCoordinateReferenceSystem_aroundBody10(CoordinateSystemWorker.java:120) at com.lggi.esp.services.ejb.spatial.core.coordinatesystem.CoordinateSystemWorker$AjcClosure11.run(CoordinateSystemWorker.java:1) at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:101) at com.lggi.esp.services.aspects.security.SecurityAspect.aroundSecuredMethods(SecurityAspect.aj:104) at com.lggi.esp.services.ejb.spatial.core.coordinatesystem.CoordinateSystemWorker.createCoordinateReferenceSystem(CoordinateSystemWorker.java:1) at com.lggi.esp.services.ejb.spatial.core.coordinatesystem.CoordinateSystemBean.createCoordinateReferenceSystem(CoordinateSystemBean.java:94) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.invocation.Invocation.performCall(Invocation.java:359) at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:237) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:158) at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:169) at org.jboss.ws.server.ServiceEndpointInterceptor.invoke(ServiceEndpointInterceptor.java:64) at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:350) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:181) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:168) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:136) at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:648) at org.jboss.ejb.Container.invoke(Container.java:954) at sun.reflect.GeneratedMethodAccessor124.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155) at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94) at org.jboss.mx.server.Invocation.invoke(Invocation.java:86) at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659) at org.jboss.invocation.jrmp.server.JRMPInvoker$MBeanServerAction.invoke(JRMPInvoker.java:819) at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:420) at sun.reflect.GeneratedMethodAccessor136.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294) at sun.rmi.transport.Transport$1.run(Transport.java:153) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:149) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701) at java.lang.Thread.run(Thread.java:595) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961628#... 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