How to call read event by using post request

Question

Hello,

I'm trying to call read event by sending post request to servlets in Tomcat.

The code which I'm using in client side is in jquery

 $.post('just.do',{username:value},function(data){

    $('#div').html(data);

   }
);

but whenever I make a post request I get a response "Oh no" of begin event. I've not closed any connection in between a request so how I call read event?

 public void event(CometEvent event) 
 throws IOException, ServletException {
 HttpServletRequest request = event.getHttpServletRequest();
 HttpServletResponse response = event.getHttpServletResponse();
 if (event.getEventType() == CometEvent.EventType.BEGIN) {
     PrintWriter out = response.getWriter();
     out.println("Oh no");
     out.flush();
 } else if (event.getEventType() == CometEvent.EventType.READ) {
            PrintWriter out = response.getWriter();
     out.println("Hello");
     out.flush();
 }
 }