AbstractPersistetCollection local class incompatible

[jjmargon]

Hi, all.
I'm developing an application in JBoss 4.0.2 with Hibernate 3 and Jbpm 3. Also, I have an EJB for give access to a Swing remote client.
Also, the EJB is a BMP (I'm going to put another topic that why I've chosed BMP instead CMP, beacuse something was wrong).
I have the next problem:
If I call the next method of the EJB

List getInstancesByUser(Tercero user){
.......
}

I obtain the next exception:

java.lang.reflect.UndeclaredThrowableException
 at $Proxy1.executeCommand(Unknown Source)
 at test.command.WorkFlowEJBTerceroCommandTest.testClientEJB(WorkFlowEJBTerceroCommandTest.java:28)
 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:324)
 at junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:474)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:342)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:194)
Caused by: java.io.InvalidClassException: org.hibernate.collection.AbstractPersistentCollection; local class incompatible: stream classdesc serialVersionUID = 7663409046372276524, local class serialVersionUID = -7982170513654570219
 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:463)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
 at java.util.ArrayList.readObject(ArrayList.java:547)
 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:324)
 at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
 at java.rmi.MarshalledObject.get(MarshalledObject.java:135)
 at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:119)
 at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:227)
 at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:167)
 at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
 at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)No existen tramites para el tercero cuyo dni es 00000096

 at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:97)
 at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
 ... 17 more

Oddly, researching the code of the EJB method, the code that generates the error is:

session.createQuery("from ProcessInstance pi order by pi.start desc").list();

If I comment this line, and I create a dummy list, I don't get the error.
Why I obtain this error?
Any help is welcome and it's urgent.
Thanks in advance.

[vbagiatis]

I have pretty much the same environment and the same problem. When I create a transient instance of my pojo and send it to the client, there will be no problem. However, if the object is persistent (e.g. loaded from the database), then I get the same InvalidClassException. (However, since I'm using CMT, I suppose the object is not persistent when sent to the client but detached).

Have you found a solution? Could you please post it if so?

[vbagiatis]

Finally, I noticed that the hibernate3.jar that was in my classpath was slightly different than that in the server/default/deploy/jboss-hibernate.deployer/ folder. So I replaced the classpath with the latter and it works fine. Hope this works for you too.