Allow for Json View customization in AbstractJackson2HttpMessageConverter

[mipo256]

We have a service that sends HTTP requests via RestTemplate API. The body is in JSON data type. The serilization happens via Jackson and therefore via AbstractJackson2HttpMessageConverter. We also want to use the Json Views feature for internal purposes. It means, that when we're sending the HTTP request, we want to serilize only a handful of fields, not all of them.

In order to use Json Views, we need to create a custom Jackson's ObjectWriter:

ObjectWriter objectWriter = new ObjectMapper()
    .registerModule(new JavaTimeModule())
    .writerWithView(Masking.class);

Unfortunately, the AbstractJackson2HttpMessageConverter only accepts the ObjectMapper as a customization parameter. It does not accepts the ObjectWrtier, rather, it constructs it internally later here. Becuase of this, there is no clear way of customizing the Json View to be used.

I hope the explaination and requirement is clear enough.

P.S: Also, I'm not sure that the AbstractJackson2HttpMessageConverter should accept the ObjectWriter directly, maybe the view can be customized via a custom void setWritingView(Class<?> view) method, or something. I'm leaving this question open for discussion.

[sdeleuze]

If I unterstand correctly your need, I think that's already supported via MappingJacksonValue wrapper that you can use to specify both the value to write and the JSON view. Please check and provide feedback.

[mipo256]

Well, AFAIK the MappingJacksonValue can be used on the @RestController level such as:

@GetMapping
public MappingJacksonValue myApi() {
    return // whatever;
}

to customize the returned object via view. But it seems it can be used on the client side to pass it to the RestTemplate. Yes, it does solve the issue @sdeleuze, thanks.