Jetty Websocket Compilation Errors - websocket

Question

I am trying to do an Jetty Web Socket example .
I copied a example from internet , which was working fine when i deployed directly into server without making any chnages .
But when i copied the Source (the servlet) into Eclipse IDE , it was giving Compilation
Exceptions related to
The method onClose(int, String) of type Html5Servlet.StockTickerSocket must override a superclass method
- The method onOpen(WebSocket.Connection) of type Html5Servlet.StockTickerSocket must override a superclass method
The method onMessage(String) of type Html5Servlet.StockTickerSocket must override a superclass method
This is my servlet , i kept the jars as it is mentioned in that example
package org.ajeesh.app;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.http.HttpServletRequest;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocketServlet;
public class Html5Servlet extends WebSocketServlet {
private AtomicInteger index = new AtomicInteger();
private static final List<String> tickers = new ArrayList<String>();
static{
tickers.add("ajeesh");
tickers.add("peeyu");
tickers.add("kidillan");
tickers.add("entammo");
}
/**
*
*/
private static final long serialVersionUID = 1L;
public WebSocket doWebSocketConnect(HttpServletRequest req, String resp) {
System.out.println("On server");
return new StockTickerSocket();
}
protected String getMyJsonTicker(){
StringBuilder start=new StringBuilder("{");
start.append("\"stocks\":[");
int counter=0;
for (String aTicker : tickers) {
counter++;
start.append("{ \"ticker\":\""+aTicker +"\""+","+"\"price\":\""+index.incrementAndGet()+"\" }");
if(counter<tickers.size()){
start.append(",");
}
}
start.append("]");
start.append("}");
return start.toString();
}
public class StockTickerSocket implements WebSocket.OnTextMessage{
private Connection connection;
private Timer timer;
#Override
public void onClose(int arg0, String arg1) {
System.out.println("Web socket closed!");
}
#Override
public void onOpen(Connection connection) {
System.out.println("onOpen!");
this.connection=connection;
this.timer=new Timer();
}
#Override
public void onMessage(String data) {
System.out.println("onMessage!");
if(data.indexOf("disconnect")>=0){
connection.close();
timer.cancel();
}else{
sendMessage();
}
}
private void sendMessage() {
System.out.println("sendMessage!");
if(connection==null||!connection.isOpen()){
System.out.println("Connection is closed!!");
return;
}
timer.schedule(new TimerTask() {
#Override
public void run() {
try{
System.out.println("Running task");
connection.sendMessage(getMyJsonTicker());
}
catch (IOException e) {
e.printStackTrace();
}
}
}, new Date(),5000);
}
}
}