Java RMI Class Cast Exception

Question

My project gets class Cast Exception when I started server and then I tried to add customer using add customer UI but when I tried for it it returns a Class Cast Exception from the server connector class.

interface CustomerController

    public interface CustomerController {
    public boolean addCustomer(Customer customer)throws RemoteException,IOException,ClassNotFoundException;
}

ServerStart,java

    public class ServerStart {
    public static void main(String[] args) {
          try {
            Registry registry=LocateRegistry.createRegistry(5050);
            System.out.println("Server is starting..");
            registry.rebind("Server", new CustomerControllerImpl());
        } catch (RemoteException ex) {
            Logger.getLogger(ServerStart.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

ServerConnector.java

    public class ServerConnector {

    private static ServerConnector serverConnector;
    private CustomerController customerController;

    private ServerConnector() throws NotBoundException, MalformedURLException, RemoteException {
        customerController = (CustomerController) Naming.lookup("rmi://localhost:5050/Server");
    }

    public static ServerConnector getServerConnector() throws NotBoundException, MalformedURLException, RemoteException {
        if (serverConnector == null) {
            serverConnector = new ServerConnector();
        }
        return serverConnector;
    }

    public CustomerController getCustomerController() {
        return customerController;
    }
}

Class cast Exception occurs at ServerConnector.java file at

customerController = (CustomerController) Naming.lookup("rmi://localhost:5050/Server");

CustomerControllerImpl.java

    public class CustomerControllerImpl extends UnicastRemoteObject implements CustomerController{

    private final CustomerFileAccess customerFileAccess = new CustomerFileAccess();

    public CustomerControllerImpl() throws RemoteException{

    }

    @Override
    public boolean addCustomer(Customer customer) throws RemoteException, IOException, ClassNotFoundException {
        return customerFileAccess.addCustomer(customer);
    }
}

here I attached the netbeans project which can be download thourgh this link

Thank you!.

Post any code related to the question here not on an external site — Reimeus
– Reimeus, Commented Sep 8, 2015 at 13:32
Could you please add the code where the actual ClassCastException happens? And am I right to assume the exception happens on the client side? — Lars Gendner
– Lars Gendner, Commented Sep 8, 2015 at 13:33
@LarsGendner customerController = (CustomerController) Naming.lookup("rmi://localhost:5050/Server"); — tryor
– tryor, Commented Sep 8, 2015 at 13:42
First question: Are you sure CustomerControllerImpl has been declared as implementing CustomerController? (Incidentally, a ClassCastException will normally have a message saying something along the lines of "X cannot be cast to Y" which can often help diagnose the issue.) — daiscog
– daiscog, Commented Sep 8, 2015 at 13:52
@daiscog yes I have implemented CustomerController for class CustomerControllerImpl I have also added that code part at the end of the question — tryor
– tryor, Commented Sep 8, 2015 at 14:02

daiscog · Accepted Answer · 2015-09-08 14:24:49Z

4

Looking through the docs, I believe it may be because your interface does not extend java.rmi.Remote.

answered Sep 8, 2015 at 14:24

daiscog

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1 Comment

daiscog Over a year ago

No worries. If you're ever in Cardiff, buy me a beer ;-)

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