Have encountered an error trying to run the Client to the LogBean example (Chapter 8). I've serached the WebLogic docs, the Java API, even the web, but am at a loss as to what this stack trace is telling me is wrong. I'm new to J2EE and still groping abit; any clues would be appreciated!

It appears the error is occurring on the following line in Client.java:

        // 4: Lookup Desintation (topic) via JNDI
        Topic topic = (Topic) ctx.lookup("testtopic");

The resulting stack trace follows:

run-client:
     [java] Got initial context.
     [java] Got ConnectionFactory.
     [java] Got Connection.
     [java] Got Session.
     [java] java.io.InvalidClassException: weblogic.jms.common.DestinationImpl; Local class not compatible: stream classdesc serialVersionUID=6099783323740404732 local class serialVersionUID=-7124492888158518181
     [java] at java.io.ObjectStreamClass.validateLocalClass(ObjectStreamClass.java:518)
     [java] at java.io.ObjectStreamClass.setClass(ObjectStreamClass.java:562)
     [java] at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:931)
     [java] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:361)
     [java] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:231)
     [java] at weblogic.rjvm.ClassTableEntry.readExternal(ClassTableEntry.java:29)
     [java] at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1207)
     [java] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:381)
     [java] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:231)
     [java] at weblogic.rjvm.InboundMsgAbbrev.readObject(InboundMsgAbbrev.java:65)
     [java] at weblogic.rjvm.InboundMsgAbbrev.read(InboundMsgAbbrev.java:37)
     [java] at weblogic.rjvm.MsgAbbrevJVMConnection.readMsgAbbrevs(MsgAbbrevJVMConnection.java:202)
     [java] at weblogic.rjvm.MsgAbbrevInputStream.readMessageContext(MsgAbbrevInputStream.java:193)
     [java] at weblogic.rjvm.ConnectionManager.dispatch(ConnectionManager.java:641)
     [java] at weblogic.rjvm.t3.T3JVMConnection.dispatch(T3JVMConnection.java:488)
     [java] at weblogic.socket.JavaSocketMuxer.processSockets(JavaSocketMuxer.java:368)
     [java] at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:23)
     [java] at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)
     [java] at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)...

OK, found the problem myself.

I had the classpath set to include /weblogic700/server/lib/*.jar. Change this to only include /weblogic700/server/lib/weblogic.jar.

I can only guess that there's some class duplication amongst the jar files in that directory. That might explain the serialization conflict.