JBoss unveil new nonblocking web server Undertow

public class HelloWorldServer {

   public static void main(final String[] args) {
       Undertow server = Undertow.builder()
               .addListener(8080, "localhost")
               .setDefaultHandler(new HttpHandler() {
                   @Override
                   public void handleRequest(final HttpServerExchange exchange) throws Exception {
                       exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                       exchange.getResponseSender().send("Hello World");
                   }
               }).build();
       server.start();
   }
}