[java] Problem with Java networking

package chatclient;

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import javax.swing.*;


public class MainFrame extends javax.swing.JFrame {

    public String name;
    public Socket socket;
    public BufferedReader in;
    public PrintWriter out;
    
    public MainFrame() {
        //show nickname dialog
        name = JOptionPane.showInputDialog(null, "Name", "Enter your name", JOptionPane.PLAIN_MESSAGE);
        
        //connect to server
        try {
            socket = new Socket("wha.tis.my.ip?", 4444);
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, "Error connecting to server. Got Exception: " 
                                        + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
            ex.printStackTrace();
            System.exit(1);
        }
        
        //open IO streams
        try {
            
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        } catch (Exception ex) {
            JOptionPane.showMessageDialog(null, "Error opening IO streams. Got Exception: " 
                                        + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
            System.exit(1);
        }
        
        //send client name
        out.println(name);
        
        //should I comment about the following command? ROFL
        initComponents();
        
        //create the SwingWorker thread to manage incoming messages without fucking up the GUI
        new SwingWorker<Void, Void>()
        {
            protected Void doInBackground() 
            {
                String s = null;
                
                while(true)
                {
                    try {
                        if ((s = in.readLine()) != null) 
                            msgTextArea.append(s);
                        
                    } catch (Exception ex) {
                        System.err.println("Error reading server messages. Got exception: " + ex.getMessage());
                        ex.printStackTrace();
                    }
                    
                    Thread.yield();
                }
            }
        }.execute();
        
        //assing a WindowListener to close all that socket stuff when the window gets closed
        addWindowListener(new WindowAdapter() 
        {
            public void windowClosing(WindowEvent e)
            {
                //here I close the socket but the in the server the socket doenst closes =o
                try{
                    out.close();
                    in.close();
                    socket.close();
                }catch(Exception ex){}
            }
        });
        
        
        //show main JFrame which runs the client messaging system
        setVisible(true);
    }
                         
    private void initComponents() {
       //...I did the GUI in NetBeans...
    }                      

//when the user clicks this button the message in the textarea is sent to server. This works, the message is actually sent...
private void sendButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    String msg = clientMsgTextArea.getText();
    clientMsgTextArea.setText(null);
    out.println(msg);
}                                          

    
    public static void main(String[] args) 
    {
        new MainFrame();
    }
    
    
    // Variables declaration - do not modify                     
    private javax.swing.JPanel clientMsgPanel;
    private javax.swing.JScrollPane clientMsgScrollPane;
    private javax.swing.JTextArea clientMsgTextArea;
    private javax.swing.JPanel msgPanel;
    private javax.swing.JScrollPane msgScrollPane;
    private javax.swing.JTextArea msgTextArea;
    private javax.swing.JButton sendButton;
    private javax.swing.JSplitPane splitPane;
    // End of variables declaration                   

}

package chatserver;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;

//stores client information
class Client 
{
    public String name;
    public Socket socket;
    public PrintWriter out;
    public BufferedReader in;
}

public class Main 
{
    public static ServerSocket serverSocket;
    public static ArrayList<Client> client;
    public static final String systemName = "[__system__]";
    
    //prints the String s in the output stream of all clients
    public static void printAll(String s)
    {
        for(Client c: client)
            c.out.print(s);//this doenst works. It silently fails. The message is not received by the client
    }
    
    public static void main(String[] args) 
    {
        try {
            //create server socket to accept connections
            serverSocket = new ServerSocket(4444);
        } catch (Exception ex) {
            System.err.println("Failed to create server socket. Got exception: " + ex.getMessage());
            System.exit(1);
        }
        
        //arraylist to hold information about every connected client
        client = new ArrayList<Client>();
        
        //simple thread to accept new connections
        new Thread("ConnectionT"){
            public void run()
            {
                while(true)
                {
                    try {
                        Socket socket = serverSocket.accept();
                        System.out.println("[Server]: New connection.");
                        Client c = new Client();
                        c.socket = socket;
                        c.out = new PrintWriter(socket.getOutputStream(), true);
                        c.in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                        c.name = c.in.readLine();
                        client.add(c);
                        
                        printAll(systemName + ": " + c.name + " gets in.\n");
                        
                    } catch (Exception ex) {
                        System.err.println("Failed to accept new connection. Got exception: " + ex.getMessage());
                    }
                    
                    Thread.yield();
                }
                
            }
        }.start();
        
        //main loop. Receives and dispatches messages for all clients
        while(true)
        {
            String batch = new String();//the message batch
            String s;
        
            //fill in the batch
            for(Client c: client)
            {
                try {
                    if(!c.socket.isClosed())
                    {
                        if(c.in.ready())
                            if ((s = c.in.readLine()) != null) //the client messages are perfectly received here
                                batch += c.name + ": " + s + "\n";
                    }
                    else
                    {
                        c.socket.close();
                        client.remove(c);
                        printAll(systemName + ": " + c.name + "gets out.\n");
                    }
                } catch (Exception ex) {
                    c.out.println(systemName + ": your message could not be sent. Got exception: " + ex.getMessage());
                }
            }
            
            //dispatch messages if any
            if(batch.length() > 0)
                printAll(batch);
            
            Thread.yield();
        }
        
    }
}