How to add logging to a webflux endpoint in spring-mvc?

Question

I have an existing spring-mvc application with different @RestController. Now I want to add a Mono<String> endpoint, and log the request timestamp with url path, as well as the response timestamp.

But how? I cannot simply @EnableWebFlux as I would have to disable spring-mvc therefor.

How could I register a filter explicit for the webflux endpoint that catches on invocation, and right before the response is written back async?

@RestController
public class FluxService {
   @PostMapping
   public Mono<String> post() {
         return webClient.post().uri(uri).bodyValue(payload).retrieve().bodyToMono(String.class);
   }
}

I want enhanced logging on the @PostMapping endpoint, not on the webClient!

score 0 · Answer 1 · answered Apr 01 '20 at 19:43

MVC is a blocking/servlet based api, mixing it with webflux isn't going to work. They use different filters, security etc as MVC assumes a lot of ThreadLocal stuff. (Can I use SpringMvc and webflux together?)

If you really want to mix them like this you could use .doOnNext() once you get your mono and call your logger there.

How to add logging to a webflux endpoint in spring-mvc?

1 Answers1