Websockets, continued
information about session

import java.io.IOException;

import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/demo4")
public class WebSocketDemo4 {

	@OnOpen
	public void greeting(Session session) {
		try {
			System.out.println("got new connection:" + session.getId());
			long timeout = session.getMaxIdleTimeout();
			boolean isSecure = session.isSecure();
			int textMessageBufferSize = session.getMaxTextMessageBufferSize();
			session.getBasicRemote().sendText(
					"Your idle timeout limit is:" + timeout);
			session.getBasicRemote().sendText(
					"Your session is " + (isSecure ? "" : "not") + " secure");
			session.getBasicRemote().sendText(
					"Your max text message size is: " + textMessageBufferSize);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

Pushing your web sockets application to heroku

• You will need an embedded Tomcat websocket dependency
• The embedded Tomcat 7 I had in my pom did not understand the websocket, so I had to upgrade to latest 8 
• Heroku works on HTTPS, therefore both JQuery and your web sockets will have to work on SSL, this simply means add the s for http and ws making them https and wss in your html files. 
• Once your application is on Heroku, localhost:8080 will not work anymore, so your html files will need to be modified

Full code is here: https://github.com/gnurmatova/WebSockets
Chatroom on heroku: https://unhsockets.herokuapp.com/demo3.html