Can't start RMI server after stopping it

I'm having a problem restarting my RMI registry after it has been stopped:

import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.UnicastRemoteObject;
import javax.swing.JOptionPane;

public class CinemaServer
{
    private Registry registry;
    ClientImpl clientImple; //remote interface implemented class
    private static String title="Cinema Pvt Ltd";

    public CinemaServer() {
        try {
            clientImple = new ClientImpl();
            registry=LocateRegistry.createRegistry(3311);
           开发者_JS百科 registry.rebind("RMI_INSTANCE", clientImple);
    } catch (RemoteException e) {
            JOptionPane.showMessageDialog(null, "Can't Start RMI Server",title,JOptionPane.ERROR_MESSAGE);
        }
    }

    public void stopServer()
    {
        try {
            registry.unbind("RMI_INSTANCE");
            UnicastRemoteObject.unexportObject(clientImple, true);
        } catch (NotBoundException e) {
            JOptionPane.showMessageDialog(null, "Can't Stop Server",title,JOptionPane.ERROR_MESSAGE);
        }
    }
}

1. I start the server with: CinemaServer ser=new CinemaServer();

2. And when I call ser.stopServer(); it stops.

3. But I cannot restart it

I'm getting:

java.rmi.server.ExportException: internal error: ObjID already in use
at sun.rmi.transport.ObjectTable.putTarget(Unknown Source)
at sun.rmi.transport.Transport.exportObject(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.exportObject(Unknown Source)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(Unknown Source)
at sun.rmi.transport.LiveRef.exportObject(Unknown Source)
...

the call is failing on createRegistry(), not on re-exporting your object. don't create the registry twice.