Null fields aren't included on `JsonInclude.Include.ALWAYS`

I’m trying to force null fields to be written. When I tried it with a newly constructed object mapper, it works fine. But the object mapper used in the message body writer doesn’t write them out.

I’m configuring the ObjectMapper in the run method of my application subclass:

env.getObjectMapper().setSerializationInclusion(JsonInclude.Include.ALWAYS);

[patrox]

@toadzky, @nickbabcock OK, looks like the url which I posted has been a dead-end, but I’ve been able to pinpoint what exactly is wrong in this scenario.

Seems like there is an interference between Jackson’s AfterburnerModule and Lombok (which is not so surprising, given the fact that both are messing with the Java bytecode).

I’ve found it out by looking up how the internal ObjectMapper used for Jackson in Dropwizard is configured:

https://github.com/dropwizard/dropwizard/blob/master/dropwizard-jackson/src/main/java/io/dropwizard/jackson/Jackson.java#L58

When I tried to serialize a Lombok annotated class using ObjectMapper with AfterburnerModule, it indeed was skipping the null fields, once I removed the AfterburnerModule, the null fields were included.

Besides, I’ve also found this past issue: https://github.com/dropwizard/dropwizard/issues/1111, describing how the set-up a customized ObjectMapper, in case if some of the pre-registered modules are not needed.

[nickbabcock]

Awesome job triaging the problem. Closing the issue because it’s kinda out of our hands