CODEWITHSUNDEEP
springjacksonconvertersmime-types
berimbolo
berimbolo

Reputation: 3829

Add new media type to Mapping2JacksonHttpMessageConverter

I am trying to add a new type to the jackson converter, its a custom type but its really just json and the standard object mapper should be ok to convert it to java objects.

I am trying the following:

@Bean
MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter()
{
    MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();

    MediaType fhir = new MediaType("application", "json+fhir");

    List<MediaType> jacksonTypes = new ArrayList<>(converter.getSupportedMediaTypes());

    jacksonTypes.add(fhir);

    converter.setSupportedMediaTypes(jacksonTypes);

    return converter;
}

When I debug the application on start up and look at the list of supported types I can see the fhir media type in there but I still get the same error:

Could not extract response: no suitable HttpMessageConverter found for response type [class MyClass] and content type [application/json+fhir]

I am looking for some help to get the message converter to work with this custom type.

Thanks

** Edit - I fixed this using Stanislavs answer below:

@Bean
RestTemplate restTemplate()
{
    RestTemplate restTemplate = new RestTemplate();

    List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();
    messageConverters.add(mappingJackson2HttpMessageConverter());

    return restTemplate;
}  

MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter()
{
    MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();    
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    converter.setObjectMapper(objectMapper);

    MediaType fhir = new MediaType("application", "json+fhir");

    List<MediaType> jacksonTypes = new ArrayList<>(converter.getSupportedMediaTypes());

    jacksonTypes.add(fhir);

    converter.setSupportedMediaTypes(jacksonTypes);

    return converter;
}

Upvotes: 2

Views: 2388

Answers (1)

StanislavL
StanislavL

Reputation: 57381

Guess your converter is not registered properly. I think Jackson separately add the converter and your bean is just ignored.

See the example

Just create your converter class extending MappingJackson2HttpMessageConverter and register it like this

<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager">
   <mvc:message-converters register-defaults="true">
      <bean class="com.example.MyMappingJackson2HttpMessageConverter"/>
   </mvc:message-converters>
</mvc:annotation-driven>

Upvotes: 2

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