gistfile1.js

//imports excluded for brevity
var websocket = new BaseWebSocketHandler() {
	
  connectionCount: 1,
  //note: webbit is single-threaded
  //you may need to change this to ConcurrentHashMap 
  //if `connections` is accessed from worker threads
  connections: new HashMap(),
  
  onOpen: function (connection) {
	    connection.send("Number of active connections: " + this.connectionCount );
	    this.connectionCount++;
	    this.connections.put(connection.hashCode(), connection);
  },
  
  onClose: function (connection) {
	     this.connectionCount--;
	     this.connections.remove(connection.hashCode());
   },

  onMessage: function (connection, message) {
		print("message arrived: "+message);
		var conns = Java.from(this.connections.values());
		for (var i = 0; i < conns.length; i++) {
		   conns[i].send(message.toUpperCase());
		}
  }
};


var helloworld = new HttpHandler {
  handleHttpRequest: function (request, response, control) {
  	//note: webbit is single-threaded
  	//this essentially means execute a block of code on next tick.
  	//Also, as per jlaskey, js closures act the same way as java8 lambdas when it comes to SAM types,
  	//so `execute` can take a function
        control.execute(function () {
	  response.content("Hello World").end();
	});
  }
};

var webServer = createWebServer(9000).
		add("/websockets", websocket).
		add("/hello", helloworld).
		add(new StaticFileHandler("./public"));

webServer.start();

print("Server running at " + webServer.getUri());

Thread.currentThread().join();