Client can't access Serializable classes on Server

Question

Hi there, i have created a very simple client server model and had it running fine. I then added a new serializable class to the server and return it in a new method. Now when i try to run that method on the client side it complains it cannot find my new serializable class ("no class def found exception: rmi/server/ServerObject.class"). This is how it's setup at the moment:
Server
-ServerFront extends Remote
-Server implements ServerFront
-ServerObject implements Serializable
The server binds itself to the registry as such:
ServerFront engine = new Server();
String name = "Server";
ServerFront stub = (ServerFront)UnicastRemoteObject.exportObject(engine, 0);
Registry registry = LocateRegistry.getRegistry();
registry.rebind(name, stub);The ServerObject class looks like this:
public class ServerObject implements Serializable
    private static final long serialVersionUID = 10L;
    //methods
}The ServerFront interface has a method as such:
ServerObject getServerObject () throws RemoteException;    Client
-Client
The client gets a reference to the server as follows:
String name = "Server";
Registry registry = LocateRegistry.getRegistry("127.0.0.1");
server = (ServerFront)registry.lookup(name);Then tries to run the getServerObject() method:
ServerObject = server.getServerObject();I run the client and server from jar files using the following commands:
start java -Djava.rmi.server.codebase="http://www.xenwars.com/Server.jar" -Djava.security.policy=security.policy -jar Server.jar
java -Djava.security.policy=security.policy -jar Client.jar"security.policy" allows all access, and the codebase URL points to my webserver where i uploaded an identical copy of the Server jar file that i'm trying to run.
So... i've read all the Sun documentation and such and i'm massively confused why my client isn't simply downloading the serializable class as it's supposed to. Any help is massively appreciated, thanks :D
Edited by: Aldarn on Feb 8, 2009 10:03 AM
Edited by: Aldarn on Feb 8, 2009 10:05 AM

Answer 1

By a mirrored interface i mean i just created an interface based off my existing serializable classes, i.e. copied the method constructors into an interface class and made the serializable class implement that interface.
I think that must have been the problem then, that i wasn't giving the client an interface to the serializable classes on the server that it was attempting to download. I thought by using RMI on a serializable class it would just download that class when it needs it and so wouldn't need an interface pre-defining it.
Thanks for the help! I'm now working on a system with 3 servers and one client, where two servers have various methods implemented and the third one acts as a bridge between the other two servers and the client - so the client only has to deal with one server. It's working fine but it's pretty annoying having to mirror all the methods from both servers' interface classes in the server that acts as a bridge's interface class - is there any way that the bridge server can inherit the other two servers interfaces into its own so i don't need to make loads of duplicate "shell" methods like this:
// second server
public ArrayList<Thing> getAllThings ()
    return things;
// bridge server
private SecondServerFront secondServer; // reference loaded in constructor
public ArrayList<Thing> getAllThings () throws RemoteException
    return secondServer.getAllThings();
}