Dropwizard ObjectMapper not honouring enable(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS)

Question

I want to be able for jackson to parse case insensitive enums. For e.g

public enum OperType {
  SUM
  PRODUCT
}

i want to accept both "SUM" and "sum" in the POST request.

I am getting hold of objectMapper in Application::run and enabling the setting:

environment.getObjectMapper().enable(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS);

But this is having no effect!

Answer 1

Jersey doesn't use objectMapper from Dropwizard bootstrap despite what Dropwizard's official documentation might lead one to believe. Needed to register custom ContextResolver in the Application::run to make it work:

environment.jersey().register(new ObjectMapperContextResolver(injector.getInstance(ObjectMapper.class)));

where:

@Provider
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> {

    private final ObjectMapper mapper;

    public ObjectMapperContextResolver(ObjectMapper mapper) {
        this.mapper = mapper;
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return mapper;
    }

}

Man these documentations around the dropwizard ecosystem can be really confusing for someone who isn't as well versed yet!