What is Undertow

• A small web container
• Supports Servlets, JSPs plus Undertow specific handlers
• Replaced JBossWeb (Tomcat fork) in WildFly 8
• Will be web container in EAP 7

What is undertow?

• Fast
• Consistently at or near the top of TechEmpower benchmarks (usually with Netty and Vert.x :)
• Small
• Easy to embed in programs with DSL API
• Doesn't mandate lots of features like JSP support
• Scalable
• Uses asynchronous model, non-blocking by default
• Very low overhead
  

How to use it

• Install WildFly
• Suffer caffeine withdrawal since you don't have time to go get coffee waiting
• Make a project embedding it
  

Handlers

• FS resources
• redirects
  
• security
• request limiting
• reverse proxies
  
• and more
  

Embedded

Undertow server = Undertow.builder()
  .addHttpListener(8080, "localhost")
  .setHandler(new HttpHandler() {
    public void handleRequest(final HttpServerExchange exchange)
                throws Exception {
      exchange.getResponseHeaders().put(Headers.CONTENT_TYPE,"text/plain");
      exchange.getResponseSender().send("Hello World");
    }
}).build();
server.start();