Java RMI 类转换异常

Question

当我启动服务器时，我的项目获得类 Cast Exception，然后我尝试使用添加客户 UI 添加客户，但是当我尝试它时，它从服务器连接器类返回一个类 Cast Exception。

接口(interface)客户 Controller

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

服务器启动,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);
        }
    }
}

服务器连接器.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;
    }
}

ServerConnector.java 文件发生类转换异常

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);
    }
}

我在这里附上了 netbeans project which can be download thourgh this link

谢谢!

Answer 1

浏览 docs ，我相信这可能是因为您的接口(interface)没有扩展 java.rmi.Remote。