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How to use Async-IO(setWriteListener) of Servlet3.1 with Spring-5 ?

Also, I found Link-A which mentions one needs to add Listener to outputStream.
On other hand Link-B says it should work with spring 5 and tomcat 8.5+.

Next I profiled a JVM and found that CoyoteOutputStream.checkNonBlockingWrite always return false with both deferredResult and NON-DeferredResult sample code.

 //MY TEST CODE  
 @GetMapping("/health")
    public DeferredResult<DummyDTO> upNRuning(){        
        DeferredResult<DummyDTO> defferedResult = new DeferredResult<>();
        newCachedThreadPool.submit(() ->
            defferedResult.setResult(new DummyDTO()));
        return defferedResult;  
    }

I was not able to try Link-A recommandation as i am not sure of NioReadListener implementation and its arguments.

PS:
Environment Spring-boot-2.0.4.RELEASE + Windows

Bhuvan
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