RMI call back - How to refer to the client project from the server project?

Question

Hi, I am working on an RMI assignment which basically needs me to use the RMI call back for the server to notify the clients.
I have 2 projects , one for the client and another for the server.
In the client project, I have a client interface and the main client class implements this interface.
In the server project, I have a server interface and a class that implements this interface.
I can use the server interface in the client project's code by adding the server project in the path of the client project. it lets me use the server interface in the code if I put "import.." statement.
But the issue is I can not do the same to access the client interface from within the server project's code. Since that will be a circular reference, the compiler does not let me use the client interface from within the server's code. This is putting me in a great difficulty and I am stuck here. What should I do so that I can use the client interface and the compiler won't complain?
Thanks for any help..
Regards.. js

Answer 1

Let me explain what I tried: I manually generated stub class of the client using the Eclipse IDE as mentioned in my previous message. The StockMSClient_Stub.class got created in my client project.
The common project has the 2 interfaces - one from the client and one from the server.
I have added reference to the common project from the client and server projects to use the interfaces.
With the above mentioned in place, when I run the server project, the registry binding of the server objects is very fine. But I am getting error in the applet at the line where I am passing the client object to the method provided by the server interface. The following is the code snippet in the applet where I am getting the error.
specifically the line: String response = objs.login(userId, password, smsClient);     ====================
public void login() {
            Registry reg = null;
            String userId = "test";
            String password = "test";
            this.smsClient = new StockMSClient();
            try {
     reg = LocateRegistry.getRegistry(rmiHost,rmiPort);
                      UserInterface obj = (UserInterface) reg.lookup(rmiStrings
                                                                                                                    [1]);
     User u = obj.find(userId);
     if (u == null) {
          System.out.println("This user is not valid");
     } else {
                     UnicastRemoteObject.exportObject(smsClient);
     reg = LocateRegistry.getRegistry(rmiHost, rmiPort);
     LoginLogoutInterface objs = (LoginLogoutInterface) reg
                               .lookup(rmiStrings[0]);
                    //getting error at the following line.
                    String response = objs.login(userId, password, smsClient);     
                     System.out.println("response :" + response);
           } catch (AccessException ae) {
                   System.out.println(ae);
           } catch (NotBoundException nbe) {
                  System.out.println(nbe);
           } catch (RemoteException re) {
                  System.out.println(re);
} //end login()====================
Error is:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
     java.lang.ClassNotFoundException: sms.rmi.graphics.StockMSClient_Stub (no security manager: RMI class loader disabled)================
I don't know why this is happening..Please help.
thanks & regards, js
Message was edited by:
jsitaraman