How to use WebSocket of Jetty

WsChatServlet.java

//This sample is how to use websocket of Jetty.
package wsapp;

import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocketServlet;

public class WsChatServlet extends WebSocketServlet {
    private static final long serialVersionUID = 1;
    private static ArrayList<MySocket> mslist = new ArrayList<MySocket>();

    public WebSocket doWebSocketConnect(HttpServletRequest req, String str) {
        return new MySocket();
    }

    private class MySocket implements WebSocket.OnTextMessage {
        protected Connection con;

        @Override
        public void onOpen(Connection connection) {
            try {
                this.con = connection;
                con.sendMessage("Hello!");
                mslist.add(this);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onClose(int i, String s) {
            mslist.remove(this);
        }

        @Override
        public void onMessage(String s) {
            for (MySocket socket : mslist) {
                try {
                    socket.con.sendMessage(s);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}