[RMI] server/client, help me.

Question

I have done a Chat with RMI, between a server and a client machine on my network.
The server start normaly, and the client manage to connect the server, but the server failed to connect the client.
Can Someone explain me why?
Here are the source files:
*********Client Distant****************
import java.rmi.*;
public interface ClientDistant extends java.rmi.Remote {
public void msg(Message m) throws RemoteException;
**********Client DistantImplementation**************
import java.io.*;
import java.net.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.MalformedURLException;
public class ClientDistantImpl extends java.rmi.server.UnicastRemoteObject implements ClientDistant, Runnable {
String nom;
String nomServeur;
/** Constructs ClientDistantImpl object and exports it on default port.
public ClientDistantImpl(String nom, String nomServeur) throws RemoteException {
super();
this.nom = nom;
this.nomServeur= nomServeur;
Thread leThread = new Thread(this);
leThread.start();
/** Register ClientDistantImpl object with the RMI registry.
* @param name - name identifying the service in the RMI registry
* @param create - create local registry if necessary
* @throw RemoteException if cannot be exported or bound to RMI registry
* @throw MalformedURLException if name cannot be used to construct a valid URL
* @throw IllegalArgumentException if null passed as name
public static void registerToRegistry(String name, Remote obj, boolean create) throws RemoteException, MalformedURLException{
if (name == null) throw new IllegalArgumentException("le nom doit etre non vide");
try {
Naming.bind(name, obj);
} catch (AlreadyBoundException ex){
          throw new IllegalArgumentException("le nom est deja utilise");
} catch (RemoteException ex){
if (create) {
Registry r = LocateRegistry.createRegistry(Registry.REGISTRY_PORT);
r.rebind(name, obj);
} else throw ex;
/** Main method.
public static void main(String[] args) {
System.setSecurityManager(new RMISecurityManager());
try {
BufferedReader entree = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Entrez votre nom");
String nom = entree.readLine();
System.out.println("Entrez le nom de la machine serveur");
String nomServeur = entree.readLine();
ClientDistantImpl obj = new ClientDistantImpl(nom, nomServeur);
String machineLocale = InetAddress.getLocalHost().getHostAddress();
               System.out.println("Machine locale : "+machineLocale);
               String[] tab = Naming.list("//"+nomServeur);
               for(int i=0; i<tab.length; i++)
                    System.out.println(tab[i] + " est enregistre sur le registre du serveur");
ServeurChat sc = (ServeurChat) Naming.lookup("//"+nomServeur+"/serveurChat");
String url = "//"+machineLocale+"/"+nom;
sc.connect(url);
System.out.println("Entrez vos messages en terminant par FIN");
String mess = entree.readLine();
while(!mess.equalsIgnoreCase("FIN")) {
Message m = new Message(url, mess);
sc.msg(m);
mess = entree.readLine();
sc.disconnect(url);
          System.exit(1);
} catch (Exception ex) {
ex.printStackTrace();
public void msg(Message m) throws RemoteException {
System.out.println(m);
public void run() {
try {
registerToRegistry(nom, this, true);
} catch (Exception ex) {
ex.printStackTrace();
          System.exit(1);
****************Serveur Chat********************
import java.rmi.*;
public interface ServeurChat extends ClientDistant {
public void connect(String url) throws RemoteException;
public void disconnect(String url) throws RemoteException;
*****************Serveur Chat Implementation**********
import java.net.*;
import java.util.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.MalformedURLException;
/** Unicast remote object implementing ServeurChat interface.
* @author Patrice Torguet
* @version 1.0
public class ServeurChatImpl extends UnicastRemoteObject implements ServeurChat {
Vector clients;
/** Constructs ServeurChatImpl object and exports it on default port.
public ServeurChatImpl() throws RemoteException {
super();
clients = new Vector();
public static void registerToRegistry(String name, Remote obj, boolean create) throws RemoteException, MalformedURLException{
if (name == null) throw new IllegalArgumentException("registration name can not be null");
try {
Naming.rebind(name, obj);
} catch (RemoteException ex){
if (create) {
Registry r = LocateRegistry.createRegistry(Registry.REGISTRY_PORT);
r.rebind(name, obj);
} else throw ex;
/** Main method.
public static void main(String[] args) {
System.setSecurityManager(new RMISecurityManager());
try {
String machineLocale = InetAddress.getLocalHost().getHostName();
System.out.println("Nom du serveur = serveurChat");
ServeurChatImpl obj = new ServeurChatImpl();
registerToRegistry("serveurChat", obj, true);
} catch (Exception ex) {
ex.printStackTrace();
public void disconnect(String url) throws RemoteException {
clients.removeElement(url);
public void msg(Message m) throws RemoteException {
Enumeration e = clients.elements();
String url = null;
while(e.hasMoreElements()){
try {
url = (String) e.nextElement();
if (!url.equalsIgnoreCase(m.url)) {
ClientDistant cl = (ClientDistant) Naming.lookup(url);
cl.msg(m);
} catch(Exception ex) {
ex.printStackTrace();
clients.removeElement(url);
public void connect(String url) throws RemoteException {
clients.addElement(url);
*************Message*********************
import java.io.*;
* @author Patrice Torguet
* @version
public class Message implements Serializable {
String url;
String msg;
/** Creates new Message */
public Message(String url, String msg) {
this.url = url;
this.msg = msg;
public String toString() {
return url + " : " + msg;
Thx for help.

Answer 1

This is the exception:
java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:350)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:137)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:124)
at java.net.Socket.<init>(Socket.java:268)
at java.net.Socket.<init>(Socket.java:95)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:20)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:115)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:494)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:169)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:78)
at ServeurChatImpl_Stub.connect(Unknown Source)
at ClientDistantImpl.main(ClientDistantImpl.java:85)