How to customize SpringWebFlux WebClient JSON deserialization?

Here's an example that customizes the ObjectMapper for JSON (de)serialization.Note that for streaming purposes, different encoders/decoders are being used but the principle remains the same for their configuration.

    ExchangeStrategies strategies = ExchangeStrategies            .builder()            .codecs(clientDefaultCodecsConfigurer -> {                clientDefaultCodecsConfigurer.defaultCodecs().jackson2JsonEncoder(new Jackson2JsonEncoder(new ObjectMapper(), MediaType.APPLICATION_JSON));                clientDefaultCodecsConfigurer.defaultCodecs().jackson2JsonDecoder(new Jackson2JsonDecoder(new ObjectMapper(), MediaType.APPLICATION_JSON));            }).build();    WebClient webClient = WebClient.builder().exchangeStrategies(strategies).build();

You can configure this for a specific WebClient:

@Autowiredpublic ItunesAlbumServiceImpl(ObjectMapper mapper) {    ExchangeStrategies strategies = ExchangeStrategies.builder().codecs(clientCodecConfigurer ->        clientCodecConfigurer.customCodecs().decoder(                new Jackson2JsonDecoder(mapper,                        new MimeType("text", "javascript", StandardCharsets.UTF_8)))    ).build();    webClient = WebClient.builder()            .exchangeStrategies(strategies)            .baseUrl("https://itunes.apple.com")            .build();}

But also on 'application level'

by configuring a CodecCustomizer:

@Beanpublic CodecCustomizer jacksonLegacyJsonCustomizer(ObjectMapper mapper) {    return (configurer) -> {        MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);        CodecConfigurer.CustomCodecs customCodecs = configurer.customCodecs();        customCodecs.decoder(                new Jackson2JsonDecoder(mapper, textJavascript));        customCodecs.encoder(                new Jackson2JsonEncoder(mapper, textJavascript));    };}

which will be made effective by the WebClientAutoConfiguration as a WebClient.Builder bean:

@Autowiredpublic ItunesAlbumServiceImpl(WebClient.Builder webclientBuilder) {    webClient = webclientBuilder.baseUrl("https://itunes.apple.com").build();}

with webflux 5.0.2, de-registerDefaults

val strategies = ExchangeStrategies.builder()                .codecs { configurer ->                    configurer.registerDefaults(false)                    configurer.customCodecs().encoder(Jackson2JsonEncoder(objectMapper, APPLICATION_JSON))                    configurer.customCodecs().decoder(Jackson2JsonDecoder(objectMapper, APPLICATION_JSON))                }.build()