JAX-RS async time out

AsyncJaxrsTimeout.java

@GET
@Produces("text/plain")
public void execute(@Suspended AsyncResponse response){
    System.out.println("Initially invoked on thread - "+ Thread.currentThread.getName() + ". This will free up soon !");
    //just having this would result in HTTP 503 after 10 seconds
    response.setTimeout(10, TimeUnit.SECONDS); 
    //client will recieve a HTTP 408 (timeout error) after 10 seconds
    response.setTimeoutHandler((asyncResp) -> asyncResp.resume(Response.status(Response.Status.REQUEST_TIMEOUT)).build());
    new Thread(() -> {
                try {
                    Thread.sleep(11000);
                } catch (InterruptedException ex) {
                   //ignoring
                }
            }).start();
}