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Vert.x logo
Original author(s) Tim Fox
Developer(s) Tim Fox, VMWare, Red Hat
Stable release 2.1.5 / November 13, 2014 (2014-11-13)
Development status Active
Written in Java, JavaScript, Groovy, Ruby, Python, Scala, Clojure
Operating system Cross-platform
Platform Java Virtual Machine
Type Event-driven networking
License Apache License version 2.0

Vert.x is a polyglot event-driven application framework that runs on the Java Virtual Machine.[1][2]

Similar environments written in other programming languages include Node.js for JavaScript, Twisted for Python, Perl Object Environment for Perl, libevent for C and EventMachine for Ruby.

As of version 2.1.4, Vert.x exposes its API in Java, JavaScript, Groovy, Ruby, Python, Scala, Clojure and Ceylon.


Vert.x was started by Tim Fox in 2011 while he was employed by VMware. In December 2012, after he left their employment, VMware served legal papers on Tim Fox to assert control of the Vert.x trademark, domain name, blog, Github account, and Google Group.[3] [4]

After much discussion with other parties, in January 2013, VMware was persuaded that it would be in the best interests of the Vert.x community to move the project and associated IP to the Eclipse Foundation, a neutral legal entity.[5]

In August 2013, the core Vert.x project completed its move to the Eclipse Foundation.

In May 2014, Vert.x won the award for "Most Innovative Java Technology" at the JAX Innovation awards.[6]


Vert.x uses low level IO library Netty.[7]

The application framework includes these features:

  • Polyglot. Application components can be written in Java, JavaScript, Groovy, Ruby, Python, Scala or Clojure.
  • Simple concurrency model. All code is single threaded, freeing from the hassle of multi-threaded programming.
  • Simple, asynchronous programming model for writing truly scalable non-blocking applications.
  • Distributed event bus that spans the client and server side. The event bus even penetrates into in-browser JavaScript allowing to create so-called real-time web applications.
  • Module system and public module repository, to re-use and share components.


A web server serving static files could be written in JavaScript like this:

vertx.createHttpServer().requestHandler(function(req) {
   var file = req.path === '/' ? 'index.html' : req.path;
   req.response.sendFile('webroot/' + file);

in Java:

public class Server extends Verticle {
  public void start() {
    vertx.createHttpServer().requestHandler(req -> {
      String file = req.path.equals("/") ? "index.html" : req.path;
      req.response.sendFile("webroot/" + file);

In Ruby:

require "vertx" do |req|
   file = req.uri == "/" ? "index.html" : req.uri
   req.response.send_file "webroot/#{file}"

In Groovy:

vertx.createHttpServer().requestHandler { req ->
   def file = req.uri == "/" ? "index.html" : req.uri
   req.response.sendFile "webroot/$file"

In Python:

import vertx
server = vertx.create_http_server()
def handle(req):
    filename = "index.html" if req.uri == "/" else req.uri
    req.response.send_file("webroot/" + filename)

In Clojure:

(ns example.server
  (:require [vertx.http :as http]))
  (-> (http/server)
      (fn [req]
        (let [uri (.uri req)]
          (-> req
            (http/send-file (str "webroot/" (if (= "/" uri) "index.html" uri)))))))
    (http/listen 8080))

All cases will result in a web server serving content in a highly scalable manner. Support for Scala is now implemented but examples not shown.

Note that these examples are not fit for production use, since the server is open to path traversal attacks, more complete examples for web servers are available in the vert.x examples repository.


External links[edit]