onComplete for async listeners not always called ------------------------------------------------ Key: WFLY-3962 URL: https://issues.jboss.org/browse/WFLY-3962 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 8.0.0.Final, 8.1.0.Final Reporter: Heiko Rupp Assignee: Stuart Douglas Fix For: 8.2.0.Final, 9.0.0.Beta1 I have a servlet filter that does chain.doFilter(requestWrapper, responseWrapper); if (request.isAsyncStarted()) { asyncListener = request.getAsyncContext().createListener(JsonPAsyncListener.class); request.getAsyncContext().addListener(asyncListener, requestWrapper, responseWrapper); } And (sometimes) this works well so that the onComplete() method of the listener is called. But this does not happen always. In some (repeatable) condition none of the callback methods in my AsyncListener are called. I was first thinking that the servlet (resteasy) behind chain.doFilter() is so fast that it completes before I can add the listener. But then I tried adding a Thread.sleep() in the RE code which did not change anything. Similar when I do a startAsync() and add the listener before calling chain.doFilter() This happens both on Wfly 8.0 and 8.1 Basically it boils down that if the "backend" uses Futures.immediateFuture(result) , onComplete is not called. I have created a as small as possible war file + a read me on how to drive that via curl. See https://github.com/pilhuhn/misc/tree/master/web-goo I just added 2 examples to the readme file that show that if no wrapping by the filter is requested, the resteasy code works with both Futures.immediate... and Futures.transform(...)