Java RMI类强制转换异常

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!.

Answer 1

浏览文档 ，我相信这可能是因为您的界面没有扩展java.rmi.Remote。