Return new remote object

Question

Hi All!
Help me!
public interface Server extends Remote {
QueryServer I() throws RemoteException;
public class ServerImplementation extends UnicastRemoteObject implements Server {
public QueryServer I() throws RemoteException {
return new QueryServerImplementation();
public ServerImplementation() throws RemoteException {
super();
public interface QueryServer extends Remote {
String Y() throws RemoteException;
public class QueryServerImplementation extends UnicastRemoteObject implements QueryServer {
public String Y() throws RemoteException {
return "Hello";
public QueryServerImplementation() throws RemoteException {
super();
Server:
public static void main(String args[]) {
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
Registry registry = LocateRegistry.createRegistry();
ServerImplementation serverImpl = new ServerImplementation();
registry.bind("XXX", serverImpl);
Client:
public static void main(String args[]) {
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
server = (Server) Naming.lookup("XXX");
QueryServer qserver = server.I();
String s = qserver.Y();
Exception java.rmi.NoSuchObjectException
What is uncorrect????
Thank you!

Answer 1

Works for me in JDK 1.3.1. What JDK are you using? and how much time if any elapses between the various client lookups and remote calls?
In general RMI clients do have to be prepared to deal with NoSuchObjectExceptions. They simply mean that the stub is stale in the DGC sense and has to be reacquired. In your case the qserver stub must be reacquired by calling server.I(). If that throws NoSuchObjectException you must reacquire the server stub by repeating the lookup.