title: How to send push notifications from a Java Servlet for web application?
body: <p>In my application I have to show a notification on a particular action taken place?</p>
  <p>I have to show logged in user a notification then.</p>
  <p>One way to get notifications is to keep polling after certain time interval. that is pull notification. But this causes unnecessary hits to server.</p>
  <p>How can I use push notifications from server?
  I am using Java Servlets and JSP with Tomcat.</p>