public void start() throws Exception
{
  server = new Server();
  Connector connector = new SelectChannelConnector();
  connector.setPort(port);
  server.addConnector(connector);

    // Setup the basic application "context" for this application at "/"
  // This is also known as the handler tree (in jetty speak)
  ServletContextHandler contextHandler = new ServletContextHandler(ServletContextHandler.SESSIONS);
  contextHandler.setContextPath("/");
  server.setHandler(contextHandler);
  WebSocketServlet webSocketServlet = new WebSocketServlet()
  {
    @Override
    public WebSocket doWebSocketConnect(HttpServletRequest request, String protocol)
    {
      return websocket;
    }
  };

  contextHandler.addServlet(new ServletHolder(webSocketServlet), "/pubsub");
  server.start();
  if (port == 0) {
    port = server.getConnectors()[0].getLocalPort();
  }
}