RMI and Callbacks - unexpected behaviour

Question

Hi,
Following the success of connecting to and invoking methods on my first remote RMI server - I am trying to implement a callback client/server in my RMI application.
// Client
private void doLogin()
    server.login(name,password,eventHandler);
void loggedIn(IRemoteUser user) throws RemoteException
    this.remoteUser = user;
// Server
void login(String name, String password, ICallBackEventHandler handler) throws RemoteException
    IRemoteUser user = new RemoteUserImpl(name,password);
    this.userHandler = handler;
    userHandler.loggedIn(user);
}When the client logs in the server invokes the loggedIn method passing a reference to the server's IRemoteUser object - this seems to work ok. However, when the client invokes a method on the returned object (the IRemoteUser) - it seems not to be invoking a RMI call - instead it gets appears to invoke locally (I put a println in the sayHello method which outputs to the clients stdout).
// Client
remoteUser.sayHello();     // outputs 'hello' to the clients stdout *not* the servers.( both IRemoteUser and ICallbackEventHandler extend java.rmi.Remote )
Initially I thought it may be because i was running the server on localhost, but now I have moved the server to a different machine and am still facing the same problem.
Any ideas/suggestions welcome.
Thanks,
Rich.

Answer 1

Sorry friend; I can't understand what you are doing.
Callback is simply an RMI invocation in the other direction. That is, the Server calls remote methods on the Client. Therefore, the Client in essence becomes a Server.
The Client exports a remote object and passes it to the Server so the Server can call the Client. This tutorial works.
http://java.sun.com/developer/onlineTraining/rmi/exercises/RMICallback/index.html