Apply codecs auto-configuration to webflux server and webclient

[bclozel]

For Spring MVC, the HttpMessageConvertersAutoConfiguration configures the appropriate message converters for the server and the client (RestTemplate).

We should do the same for WebFlux, using ServerCodecConfigurer and ClientCodecConfigurer.

[snicoll]

Interesting convo in #9485

[alimate]

Probably the same issue

[bclozel]

Some changes are required in Framework to consistently apply codec configuration on both client and server sides, see SPR-15682.

[bjornharvold]

Apologies, I am looking everywhere in the Spring Boot documentation and I cannot find any reference to how to get the WebTestClient to pick up my custom objectMapper. I am using Spring Boot 2 and my custom object mapper is not being used. Is there specific configuration required?

I am assuming this ticket fixed it somehow.

Cheers

[bclozel]

If you inject a WebTestClient in your tests, it should be customized with codecs automatically.
If your application declares an ObjectMapper beans, it should override the opinion provided by Spring Boot and be picked up in the HTTP message conversion and client codecs configuration.

If it's not the case, please create a new issue with a small repro project I can take a look at.

Thanks!

[bjornharvold]

Hi @bclozel

I did what I saw in the other ticket that started this and added:

@Bean
    Jackson2JsonEncoder jackson2JsonEncoder() {
        return new Jackson2JsonEncoder(objectMapper());
    }

    @Bean
    Jackson2JsonDecoder jackson2JsonDecoder() {
        return new Jackson2JsonDecoder(objectMapper());
    }

    @Bean
    WebFluxConfigurer webFluxConfigurer(Jackson2JsonEncoder encoder, Jackson2JsonDecoder decoder) {
        return new WebFluxConfigurer() {
            @Override
            public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
                configurer.defaultCodecs().jackson2JsonEncoder(encoder);
                configurer.defaultCodecs().jackson2JsonDecoder(decoder);
            }
        };
    }

to my mock setup.