Writing JSPs to play chess; I get a null at a point, where I shouldn't

I am writing a set of JSP pages in order to play chess online. I know it is better to do this task using an applet, but the man I am working for doesn't want it to be an applet. The idea is two clients play a game, while in fact manipulating a single object in the application or ServletContext object. If one of the clients makes a move - he modifies the Game object and the thread (a loop checking if the Game object has changed), created by the other client stops and his service method visualizes the move his opponent has made. As soon as a client submits a move - his service method creates and join()s the thread waiting for the next change in the Game object.
MY PROBLEM IS: THE SECOND TIME THE HOST PLAYS A MOVE HIS OPPONENT GETS A NULL INSTEAD OF VALID Game OBJECT. CAN ANYONE TELL ME WHY BECAUSE I HAVEN'T SET IT TO NULL ANYWHERE IN THE CODE
I have the following files: chessOnline.jsp, hostGame.jsp, joinGame.jsp, play.jsp, quitGame.jsp and a few .class files: Game.class, MovesStateChecker and GameOnChecker.
chessOnline.jsp has two functions:
1. to join a created game
2. to create a new game
joinGame.jsp and hostGame.jsp are just like play.jsp with the difference that they initialize the game; the code is quite the same.
---------------------------------------MovesStateChecker ----------------------------------------
public class MovesStateChecker extends Thread
     private ServletContext sc;
     private int movesNumber;
     public MovesStateChecker(String name,ServletContext sc,int movesNumber)
          super(name);
          this.movesNumber=movesNumber;
          this.sc=sc;
     public void run()
          Game g=null;
          int retries=0;
          while(true)
               try {
                    Thread.sleep(1500);
               } catch (InterruptedException e) {}
               g=(Game)sc.getAttribute(this.getName());
               if(g==null){retries+=1;continue;}
               if(g.getMoves().size()>movesNumber){break;}
---------------------------------------end of MovesStateChecker.class------------------------
---------------------------------------joinGame.jsp--------------------------------------------------
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.Map,java.io.IOException,chessoffice.*,java.sql.*" errorPage="" %>
<%
response.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
response.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
response.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility
%>
<html>
<head>
<link rel="stylesheet" href="styles.css" type="text/css" />
<title>Read</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
     if (Strings.dbCheckSession(request))
          String user =(String)session.getAttribute("sessionUser");
          if(request.getParameter("gameId")==null || request.getParameter("gameId").equals(""))
               response.sendRedirect(response.encodeURL("/jsp/chessOnline.jsp"));
          else
               Game joinedGame=(Game)application.getAttribute(request.getParameter("gameId"));
               if(joinedGame.getBlack()==null)
               {joinedGame.setBlack(user);}
               else
               {joinedGame.setWhite(user);}
               joinedGame.setGameOn(true);
               application.setAttribute(request.getParameter("gameId"),joinedGame);
               MovesStateChecker msc=new MovesStateChecker(joinedGame.getId(),application,0);
               msc.start();
               msc.join();
               Game g=(Game)application.getAttribute(request.getParameter("gameId"));
               if(g==null)
                    response.sendRedirect(response.encodeURL("/jsp/chessOnline.jsp?error=opponentQuit"));
               else
                    out.println(g.getWhite()+" - white player<br />");
                    out.println(g.getBlack()+" - black player<br />");
                    out.println(g.getMoves().size()+" - size of Moves array list (number of moves)<br />");
                    out.println(g.isGameOn()+ " - is the game on <br />");
                    out.println(g.getDesk().get("b2")+" - b2 position<br />");
                    out.println(g.getDesk().get("b4")+" - b4 position<br />--------------------<br />");
                    out.println("<table width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">");
                    out.println("<tr><td>");
                    Read.drawDesk(false,g.getDesk(),out);
                    out.println("</td><td>");
                    Read.drawInfoForm(request.getParameter("gameId"),out);
                    out.println("</td></tr>");
                    out.println("</table><br /><hr />");
                    Read.drawQuitForm(request.getParameter("gameId"),out);
     else response.sendRedirect(response.encodeURL("/jsp/index.jsp"));
%>
</body>
</html>
---------------------------------------end of joinGame.jsp-----------------------------------------
----------------------------------------hostGame.jsp-------------------------------------------------
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.io.IOException,chessoffice.*,java.util.*,java.sql.*" errorPage="" %>
<%!
     public Map initGameMap() {
          Map m=Collections.synchronizedMap(new HashMap(64,(float)0.1));
          for(int ver=8;ver>=1;ver--)     {
               for(int hor=0;hor<=7;hor++) {
                    switch(ver) {
                         case 1: m.put(""+Read.chars[hor]+ver,"white/"+Read.bfigs[hor]+".gif");break;
                         case 2: m.put(""+Read.chars[hor]+ver,"white/p.gif");     break;
                         case 7: m.put(""+Read.chars[hor]+ver,"black/p.gif");     break;
                         case 8: m.put(""+Read.chars[hor]+ver,"black/"+Read.bfigs[hor]+".gif");break;
                         default: m.put(""+Read.chars[hor]+ver,null);break;
          return m;
%>
<%
response.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
response.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
response.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility
%>
<html>
<head>
<script language="JavaScript" type="text/javascript">
     function selectFigure(cell)
          /*oldPos=cell.name;
          bgImage=cell.background;
          document.write(bgImage.substring(0,bgImage.indexOf("."))+"_"+bgImage.substring(bgImage.indexOf(".")-1,bgImage.length()));
          cell.background=bgImage.substring(0,bgImage.indexOf("."))+"_"+bgImage.substring(bgImage.indexOf(".")-1,bgImage.length());
          alert("cell name is: "+cell.background);
</script>
<title>chess online</title>
<link rel="stylesheet" href="styles.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
     if (Strings.dbCheckSession(request))
          String user=(String)session.getAttribute("sessionUser");
          Game initialGame=new Game();
          initialGame.setId(user);
          if(request.getParameter("color")!=null)
               if(request.getParameter("color").equals("white"))
                    initialGame.setWhite(user);
               else
                    initialGame.setBlack(user);
          else
               initialGame.setWhite(user);
          initialGame.setGameOn(false);
          initialGame.setWhiteTime(10*60*1000);
          initialGame.setBlackTime(10*60*1000);
          initialGame.setMoves(new ArrayList());
          initialGame.setDesk(this.initGameMap());
          initialGame.setCaptured(new ArrayList());
          application.setAttribute(initialGame.getId(),initialGame);
          GameOnChecker goc=new GameOnChecker(initialGame.getId(),application);
          goc.start();
          goc.join();
          Game g=(Game)application.getAttribute(user);
          out.println(g.getWhite()+" - white player (host)<br />");
          out.println(g.getBlack()+" - black player<br />");
          out.println(g.getMoves().size()+" - size of Moves array list (number of moves)<br />");
          out.println(g.isGameOn()+ " - is the game on<br />");
          out.println(g.getDesk().get("b2")+" - b2 position<br />");
          out.println(g.getDesk().get("b4")+" - b4 position<br />-------------------<br />");
          out.println("<table width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">");
          out.println("<tr><td>");
          Read.drawDesk(false,g.getDesk(),out);
          out.println("</td><td>");
          Read.drawInfoForm(user,out);
          out.println("</td></tr>");
          out.println("</table><br /><hr />");
          Read.drawQuitForm(user,out);
     else response.sendRedirect(response.encodeURL("/jsp/index.jsp"));
%>
</body>
</html>
----------------------------------------end of hostGame.jsp----------------------------------------
----------------------------------------play.jsp-------------------------------------------------
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="chessoffice.*,java.sql.*" errorPage="" %>
<%
response.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
response.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
response.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility
%>
<html>
<head>
<link rel="stylesheet" href="styles.css" type="text/css" />
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
boolean overtake=(request.getParameter("overtake").equals("true"))?true:false;
String bgImage=request.getParameter("bgImage");
String oldPos=request.getParameter("old");
String newPos=request.getParameter("new");
String gameId=request.getParameter("gameId");
if(newPos!=null && oldPos!=null && bgImage!=null && gameId!=null)
     //tuk trqbva da ima proverka na hod-a
     //posle se suzdava obekt ot tipa Move i se zapisva v Game.moves:
     Move m=new Move(oldPos,newPos,overtake,bgImage);
     Game loadedGame=(Game)application.getAttribute(gameId);
     loadedGame.updateDesk(m);
     int currentMovesNumber=loadedGame.getMoves().size();
     application.setAttribute(gameId,loadedGame);
     MovesStateChecker msc=new MovesStateChecker(loadedGame.getId(),application,currentMovesNumber);
     msc.start();
     msc.join();
     Game g=(Game)application.getAttribute((String)session.getAttribute("sessionUser"));
     if(g==null)
          out.println("izvadenata igra e NULL");
          //response.sendRedirect(response.encodeURL("/jsp/chessOnline.jsp?error=opponentQuit"));
     else
          out.println(g.getWhite()+" - white player<br />");
          out.println(g.getBlack()+" - black player<br />");
          out.println(g.getMoves().size()+" - size of Moves array list (number of moves)<br />");
          out.println(g.isGameOn()+ " - is the game on <br />");
          out.println(g.getDesk().get("b2")+" - b2 position<br />");
          out.println(g.getDesk().get("b4")+" - b4 position<br />--------------------<br />");
          out.println("<table width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">");
          out.println("<tr><td>");
          Read.drawDesk(false,g.getDesk(),out);
          out.println("</td><td>");
          Read.drawInfoForm(request.getParameter("gameId"),out);
          out.println("</td></tr>");
          out.println("</table><br /><hr />");
          Read.drawQuitForm(request.getParameter("gameId"),out);
%>
</body>
</html>
----------------------------------------play.jsp----------------------------------------
------------------------------------------chessOnline.jsp----------------------------------------------------
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.util.*,java.io.*,chessoffice.*,java.sql.*" errorPage="" %>
<%!
public void drawJoinGameForm(javax.servlet.jsp.JspWriter out,ServletContext application) throws IOException
     out.println("<form action=\"joinGame.jsp\" method=\"get\">");
     out.println("<select style=\"width:300\" name=\"gameId\" size=\"6\" size=\"120\">");
     Enumeration e=application.getAttributeNames();
     while(e.hasMoreElements())
          String el=(String)e.nextElement();
          if(el.length()<=20 && ((Game)application.getAttribute(el)).isGameOn()==false)
          out.println("<option value=\""+el+"\" >"+el+"</option>");
     out.println("</select>");
     out.println("<br /><input type=\"submit\" value=\"Join Game\" />");
     out.println("</form>");
public void drawHostGameForm(javax.servlet.jsp.JspWriter out) throws IOException
     out.println("<form action=\"hostGame.jsp\" method=\"get\" name=\"hostGameForm\">");
     out.println("<input type=\"submit\" value=\"Host New Game\" />");
     out.println("<br />Choose your color:<br />");
     out.println("<input type=\"radio\" name=\"color\" value=\"white\" checked=\"checked\" /> White");
     out.println("<input type=\"radio\" name=\"color\" value=\"black\" /> Black");
     out.println("</form>");
public void drawCancelForm(String user,javax.servlet.jsp.JspWriter out) throws IOException
     out.println("<form action=\"quitGame.jsp\" method=\"get\">");
     out.println("<input type=\"hidden\" name=\"gameId\" value=\""+user+"\" />");
     out.println("<input type=\"submit\" value=\"Cancel Game\" />");
     out.println("</form>");
%>
<%
     response.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
     response.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
     response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
     response.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility
%>
<html>
<head>
<link rel="stylesheet" href="styles.css" type="text/css" />
<title>Chess Online</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
     if (Strings.dbCheckSession(request))
          if(request.getParameter("error")!=null && request.getParameter("error").equals("opponentQuit"))
               out.println("<br /><br />"+request.getParameter("error"));
          out.println("<table border=\"0\" align=center>");
          out.println("<tr><td rowspan=\"2\">");
          drawJoinGameForm(out,application);
          out.println("<br /><p>As soon as you join, your opponent, who is hosting the game, is on the move and your browser is waiting/loading.</p>");
          out.println("</td><td>");
          drawHostGameForm(out);
          out.println("</td><td>");
          drawCancelForm((String)session.getAttribute("sessionUser"),out);
          out.println("</td></tr>");
          out.println("<tr><td align=\"right\" colspan=\"2\">");
          out.println("<p>After hosting a game by clicking on the button 'Host New Game' your browser will be in process of loading a page."
          +" As soon as an opponent joins your game you will be able to make the first move. If you do not wish to wait any longer for "
          +"an opponent to join - click on 'Cancel Game'.</p>");
          out.println("</td></tr>");
          out.println("</table>");
     else response.sendRedirect(response.encodeURL("/jsp/index.jsp"));
%>
</body>
</html>
-----------------------------------end of chessOnline.jsp--------------------------------------------------
I also have a Read.class - its name doesn't mean anything - I have stored some out.println(); operations there - drawDesk(...), drawQuitForm(...), drawInfoForm(...) etc.
MY PROBLEM IS: THE SECOND TIME THE HOST PLAYS A MOVE HIS OPPONENT GETS A NULL INSTEAD OF VALID Game OBJECT. CAN ANYONE TELL ME WHY BECAUSE I HAVEN'T SET IT TO NULL ANYWHERE IN THE CODE

This forum is about JMS, NOT JSP!!!

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i have an ipod nano 5th generation. the problem with it's that it doesn't show in itunes when connected to the laptop and it switches on on its own and songs start playing the battery gets consumed too fast after full charge. what is the actual problem?

What have you tried so far in terms of troubleshooting this issue? Are you plugging the iPod into a high powered USB 2.0 port on the back of your PC? Have you tried a different USB cable?
What happens if you try to reset the device with it still connected to the PC?
How to reset iPod
Has this iPod ever worked on this PC or is this the first time you have time you have tried connecting it?
Have you carefully worked through each and every single suggestion in this Apple support document?
iPod not recognized in 'My Computer' and in iTunes for Windows
B-rock

Problem with viewing a rented movie. Whem I try playing it I get a message saying my apple tv is not authorized.

Problem with viewing a rented movie. Whem I try playing it I get a message saying my apple tv is not authorized.

is this a rental from the Apple TV or one you have in iTunes. If from the Apple TV try restarting the Apple TV, if from iTunes, try de/re-authorising your account.

I downloaded album and half of the songs dont play can i get a refund

i downloaded emeli sande's album and the sng do not play can i get a refund if i can how?

Welcome to the Apple Community.
Try deleting the problematic file (electing to remove original file if/when prompted) and then re-downloading the file from the iTunes store.
You can re-download content purchased from the iTunes store (availability varies depending on location) using the purchased option from the Quick Links section in the top right corner of the iTunes homepage in your iTunes application on your computer.
You can re-download content purchased from the iTunes store (availability varies depending on location) using the purchased option at the bottom of the screen of the iTunes app (or video app) on your iOS device.
If the problem re-occurs, select the content which is causing a problem and use the 'Report a problem' button in Your Purchase History using your computer.

I can download ok but when I try to Play movie I get error -42110

I can download ok but when I try to Play movie I get error -42110, can anyone explain why and how to resolve? I have restarted my machine and all installations are up to date

From iTunes: Advanced iTunes Store troubleshooting - Apple Support :
"Error 3001," "-42110," or "5103"
This alert is related to iTunes Store movie rentals and authorization issues.
Make sure you are using the most recent version of iTunes and QuickTime. They both can be downloaded free of charge.
If your iTunes is up to date, remove the SC Info folder.

Since my update, when I try to view videos(rather I already owned or just rented from iTunes) the movie starts playing then I get a pop up can't download view. I've reset my settings, still not working.

Since my update, when I try to view videos(rather I already owned or just rented from iTunes) the movie starts playing then I get a pop up can't download view. I've reset my settings, still not working.

You said:
We still couldn't get it to stop timing out. I tried to download the firmware from iClarified but iTunes said it didn't recognise the software.
Just what did yo do to gt iTunes to see the download:

Writing JSPs to play chess; I get a null at a point, where I shouldn't

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