Hello guys,

could you help me a little bit with Undertow? 

I follow all instructions in Undertown's poor documentation. So here is the class :

public class HelloWorldServer {

    public static void main(String... args) {

        Undertow server = Undertow.builder()

                .addHttpListener(8080, "localhost")

                .setHandler(new HttpHandler() {

                    @Override

                    public void handleRequest(final HttpServerExchange exchange) throws Exception {

                        if (exchange.isInIoThread()) {

                            System.out.println("Thread #" + Thread.currentThread().getName() + " is I/O : handle this");

                            exchange.dispatch(this);

                            return;

                        }

                        //[1]

                        System.out.println("Thread #" + Thread.currentThread().getName() + " Start waiting");

                        Thread.sleep(15000);

                        System.out.println("Thread #" + Thread.currentThread().getName() + " Finish waiting");

                        System.out.println();

                        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");

                        exchange.getResponseSender().send("Hello world from thread " + Thread.currentThread().getId());

                        //[2]

                    }

                }).build();

        server.start();

    }

}

 

When I start it and make three http get request simultaneously I can see this output in console :

I think that code beetween //[1] and //[2] should perform in separate thread (and as we can see from the console it really does), but why the main I/O thread are waiting and does not handle other requests?

So if my code is correct than it means that Undertow could handle one request in time...

What I do wrong?