Creating a Web Component to Support Comet

1. Create an empty servlet class, like the following:

   import javax.servlet.*;
   
   public class HiddenCometServlet extends HttpServlet {
   	private static final long serialVersionUID = 1L;
   private String contextPath = null;
   	@Override
   	public void init(ServletConfig config) throws ServletException {}
   
   	@Override
   	protected void doGet(HttpServletRequest req, 
   	HttpServletResponse res) 
   	throws ServletException, IOException {}
   
   	@Override
   	protected void doPost(HttpServletRequest req, 
   	HttpServletResponse res)
   	throws ServletException, IOException {);
   }

2. Import the following Comet packages into the servlet class:

   import com.sun.grizzly.comet.CometContext;
   import com.sun.grizzly.comet.CometEngine;
   import com.sun.grizzly.comet.CometEvent;
   import com.sun.grizzly.comet.CometHandler;

3. Import these additional classes that you need for incrementing a counter and writing output to the clients:

   import java.io.IOException;
   import java.io.PrintWriter;
   import java.util.concurrent.atomic.AtomicInteger;

4. Add a private variable for the counter:

   private final AtomicInteger counter = new AtomicInteger();