RMI & Web Start Client (ClassNotFound)

Question

Hi,
I've been using RMI with a client application and it works find but now I have tried to run the same application via web start I'm getting RMI issues. I've fixed all sorts of other issues but Im stuck on the RMI one. I get a ClassNotFound exception when Register.lookup() is called.
The code in the client is :
Registry registry = LocateRegistry.getRegistry("localhost", 1234);
// lookup the factory
universe = (IMyFactory) registry.lookup("rmi:///MyFactory");
The exception is thrown on the lookup. It can't find IMyFactory_stub. If I put the following line in after the Register creation :
register.list()
and dump the contents it has one entry
rmi:///MyFactory
I take it this implies that the web start client has talked to the server to get hold of the classes that have been bound. This appears to match exactly what I am looking up. So its not getting the interface file ! Im know RMI expert to why would this be the case with Web Start but not standalone ?
The MyFactory class is contained in a jar file declared in the jnlp file and available to the client. The IMyFactory and MyFactory_stub classes are in a jar file available to the server. MyFactory implements IMyFactory which is a Remote.
Oh also the jnlp file has all permisions set.
As I say it works fine as a stand alone client.
Any idea's what this could be ? Some setting unique to web start, different format for the url required (I tried using Naming.lookup() but this failed also).
The app seems to hang for a few seconds before the exceptions is thrown. If I give it a url to the wrong box it blows up str8 away.
The exception is :
java.rmi.UnmarshalException: error unmarshalling return; nested
exception is:
java.lang.ClassNotFoundException: com.me.MyFactory_Stub
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at com.me.getMyServer(getMyServer.java:116)
at com.me.main(agentsupport.java:6825)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.continueLaunch(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.me.MyFactory_Stub
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
... 21 more
Thanks for any help, I'm out of idea's and totally stuck.
Steve

Answer 1

Hi Kal,
since we're currently evaluating the software and haven't acquired a license, we cannot contact support.
I only need to know if this is a solved bug or not. Does it have to do with the classloading process (I cannot think of anything else)?
Thank you again very very much!
Cheers,
Paul.