resttemplate getForObject map responsetype

Question

Update 02/05/2018 (about 4 years later)...I tested this again as people have been upvoting my question/answer and Sotirios Delimanolis is correct that I should not h

Answer 1

I know its old, but just for other people that may visit this topic: If you want to register some additional converters with RestTemplateBuilder you also have to explicitly register default ones

@Bean
public RestTemplateBuilder builder() {
    return new RestTemplateBuilder()
            .defaultMessageConverters()
            .additionalMessageConverters(halMessageConverter());
}

private HttpMessageConverter halMessageConverter() {
    ObjectMapper objectMapper = new ObjectMapper().registerModule(new Jackson2HalModule());
    TypeConstrainedMappingJackson2HttpMessageConverter halConverter = new TypeConstrainedMappingJackson2HttpMessageConverter(ResourceSupport.class);
    halConverter.setSupportedMediaTypes(Collections.singletonList(MediaTypes.HAL_JSON));
    halConverter.setObjectMapper(objectMapper);
    return halConverter;
}