Exception in thread "main" java.net.SocketException: Broken pipe ???

Hello Experts,

I need your assistance about the following problem which occurs during the communication of the server and the client

Exception in thread "main" java.net.SocketException: Broken pipe
      at java.net.SocketOutputStream.socketWrite0(Native Method)
      at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
      at java.net.SocketOutputStream.write(SocketOutputStream.java:115)
      at java.io.DataOutputStream.write



Thanks in advance for any assistance !

//Server code:
 
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.Vector;
 
public class ClientServerMsg {
 
	static final int LISTENING_PORT = 1025;
 
	public static void main(String[] args) throws Exception {
 
		ServerSocket listener;
		listener = new ServerSocket(LISTENING_PORT);
		System.out.println("Port: " + LISTENING_PORT);
		while (true) {
			Socket connection = listener.accept();
			new ConnectionHandler(connection);
		}
 
	}
 
	static class ConnectionHandler extends Thread {
 
		int MAX = 10;
		Vector msgsList = new Vector();
 
		Socket connection;
		PrintWriter out;
		//out = System.out;
		
		private OutputStream outputstream;
		
		  ConnectionHandler(Socket conn) throws IOException {
	            connection = conn;
	            outputstream = conn.getOutputStream();
	            out = new PrintWriter(outputstream, true);
	            start();
	        }
		/*
		ConnectionHandler(Socket conn) {
			connection = conn;
			start();
		}
		*/
 
		void sendPOSTMESSAGE(String msg) throws Exception {
			try {
				if (msgsList.size() < MAX) {
					msgsList.addElement(msg);
					out.println("OK");
					out.flush();
				} else {
					out.println("ERROR");
					out.flush();
				}
			} catch (Exception ex) {
				out.println("ERROR");
				out.flush();
			}
 
			if (out.checkError())
				throw new Exception("Error while receiving the message");
		}
 
		void sendREADMESSAGE() throws Exception {
			if (msgsList.size() == 0) {
				out.println("ERROR");
				out.flush();
			} else if (msgsList.size() > 0) 
			{
				for (int i = 0; i < msgsList.size(); i++) {
					if (((String) msgsList.elementAt(i)).startsWith("URGENT:")) {
						out.write((String) msgsList.elementAt(i));
						msgsList.remove(i);
					} else {
						out.write((String) msgsList.elementAt(0));
						msgsList.remove(0);
					}
				}
			} else {
				if (out.checkError())
					throw new Exception("Error");
			}
		}
 
		void sendREMOVEMESSAGE(String remvmsg) throws Exception {
			for (int i = 0; i < msgsList.size(); i++) {
				if (((String) msgsList.elementAt(i)).equals(remvmsg)) {
					msgsList.remove(i);
					out.println("OK");
					out.flush();
				} else {
					out.println("ERROR");
					out.flush();
				}
			}
		}
 
		void sendQUIT() throws Exception {
			out.close();
			connection.close();
		}
 
		public void run() {
 
			String command = "";
			try {
				InputStream instream = null;
				try {
					instream = connection.getInputStream();
				} catch (IOException e) {
					e.printStackTrace();
				}
				Scanner in = new Scanner(instream);
				try {
					outputstream = connection.getOutputStream();
				} catch (IOException e) {
					e.printStackTrace();
				}
				//command = in.nextLine();
				if (in.hasNextLine()) {
					command = in.nextLine();
				}
				if (command.startsWith("POSTMESSAGE")) {
					try {
						sendPOSTMESSAGE(command);
					} catch (Exception e) {
						e.printStackTrace();
					}
				} else if (command.equals("READMESSAGE")) {
					try {
						sendREADMESSAGE();
					} catch (Exception e) {
						e.printStackTrace();
					}
				} else if (command.startsWith("REMOVEMESSAGE")) {
					try {
						sendREMOVEMESSAGE(command);
					} catch (Exception e) {
						e.printStackTrace();
					}
				} else if (command.equals("QUIT")) {
					try {
						sendQUIT();
					} catch (Exception e) {
						e.printStackTrace();
					}
				} else {
					out.println("UNKNOWN COMMAND");
					out.flush();
				}
			} finally {
				try {
					connection.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
 
	}
 
}
 
 
 
//Client code:
 
import java.io.*;
import java.net.*;
 
public class Client {
 
	public static void main(String argv[]) throws Exception
	{
		String sentence;
		String modifiedSentence;
		String hostname;
		int portNumber;
		String portString;
 
		BufferedReader inFromUser =
			new BufferedReader(new InputStreamReader(System.in));
		System.out.println("What host would you like to connect to?");
		hostname = inFromUser.readLine();
		
		System.out.println("What port would you like to connect to?");
		portString = inFromUser.readLine();
 
		portNumber = Integer.parseInt(portString);
 
		System.out.println("Connecting to port "+ portNumber+ " of "+ hostname +"....\n");
		Socket clientSocket = new Socket(hostname, portNumber);
 
		DataOutputStream outToServer =
			new DataOutputStream(clientSocket.getOutputStream());
 
		BufferedReader inFromServer =
			new BufferedReader(new
					InputStreamReader(clientSocket.getInputStream()));
 
		System.out.println("Connection establised");
 
 
		sentence = inFromUser.readLine();
		while (sentence != null)
		{
			/* send the sentence to the server */
		        outToServer.writeBytes(sentence + '\n'); 
			/* read response from the server */
			modifiedSentence = inFromServer.readLine();
			
			outToServer.flush();
		}
 
		clientSocket.close();
 
	}
}

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