100% cpu usage due to nio selector.open

Question

Hello guys,
I am developing a multiplayer game using nio.In the begging i read all document related to nio.I have never heared about this api uses 100% cpu at server side as well as client side.
When i start my server which is non blocking the cpu usage is dierctly raise to 100%.Working on Operating System windows 2000.Here is my code of server side.
public void initializeOperations() throws IOException,UnknownHostException
          System.out.println("Inside initialization");
          sel = Selector.open(); //THIS FUNCTION RAISES CPU PERFORMANCE TO 100%....
          server = ServerSocketChannel.open();
          server.configureBlocking(false);
          InetAddress ia = InetAddress.getLocalHost();
          //InetSocketAddress isa = new InetSocketAddress(ia,port);
          InetSocketAddress isa = new InetSocketAddress(ia,port);
          server.socket().bind(isa);
     public void run() //startServer() throws Exception
          try
               System.out.println("Inside startserver run()");
     initializeOperations();
               SelectionKey acceptKey = server.register(sel, SelectionKey.OP_ACCEPT );
               while (acceptKey.selector().select() > 0 )
          Set readyKeys = sel.selectedKeys();
          Iterator it = readyKeys.iterator();
          while (it.hasNext()) {
          SelectionKey key = (SelectionKey)it.next();
          it.remove();
          if (key.isAcceptable())
          System.out.println("Key is Acceptable");
ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
     socket = (SocketChannel) ssc.accept();
     socket.configureBlocking(false);
SelectionKey another = socket.register(sel,SelectionKey.OP_READ|SelectionKey.OP_WRITE);
          if (key.isReadable())
                              System.out.println("Key is readable");
                              String ret = readMessage(key);
                              System.out.println("Frm clinet:"+ret);
                              socket = (SocketChannel)key.channel();
          catch(Exception e)
               System.out.println("Exception in ServerConnection:run()");
               e.printStackTrace();
Please see the code where i mentioned comment at that time cpu usage goes upto 100%.
i searched the forum and find that OP_WRITE is creating problem but in my case even client is not comming than also server side cpu usage raises.
please suggest proper solution
thank you

Answer 1

thank you for your suggestion...
so u r telling to compile my application in new version of jdk and run from there..m i right???ok...
i have tried this also in latest version jdk1.5.0_04 than also my cpu usage raise to 100%..
Now i m trying using 1.4.2_08 hope it will work....
is there any other idea to solve my problem please help me out...
thank you