Usage

Start up the sample with gradlew run and goto http://localhost:8080/error.

Question - Wildfly 14 doesn't always call AsyncListener.onComplete()

In undertow Version 2.0.12.Final we observed a behavior change in asynchronous servlet processing. Since 2.0.12.Final the AsyncListener#onComplete() method is no longer called in our sample - AsyncErrorServlet. As we try to release allocated resources in the onComplete() callback as suggested by the servlet specification, we gently ask, if the new behavior is intended or might be a bug introduced in this version.

Servlet code from AsyncErrorServlet

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.startAsync(); 
    throw new NullPointerException();
}

I would expect that both onError() and onComplete() callbacks are called by undertow.

LoggingAsyncListener.onError(status = 200) throwable = java.lang.NullPointerException LoggingAsyncListener.onComplete(status = 500)

Since version 2.0.12.Final the onComplete() callback is missing. Could you please clarify, if this is a bug in undertow or intended behavior? Thanks for your support,