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Global `@JsonInclude(Include.NON_NULL)` for all properties with a specific type

See original GitHub issue

When trying to optionally skip the certain fields when serialising certain beans, I put them into Java-8 Optional<> wrappers, as that’s what allows me to differentiate between omitted and explicit null values on deserialisation.

As described in my respective Stackoverflow question and answer, I struggled to achieve this in a generic way via MixIns, as the (default) JacksonAnnotationIntrospector is ignoring them (at least for the @JsonInclude annotation I was looking at). My final workaround is far from ideal, but at least works for this one isolated use case.

Are MixIns intentionally left out there or is it a bug?

Confirmed this under 2.7.4, 2.7.8, 2.8.5, and 2.8.6.

Issue Analytics

State:
Created 7 years ago
Comments:18 (18 by maintainers)

Top GitHub Comments

1reaction

cowtowncodercommented, Mar 11, 2017

@CarstenWickner Yes, but with reproduction you can easily add @JsonInclude for NullableInteger, and that behaves same as mix-in. So I am reasonably confident this is not related to mix-in handling but the fact that class-annotation (mix-in is simply a trick to make class annotation stick to a class without direct addition) is not used in such a setup for some reason.

I did also observe that property-annotation does indeed work.

0reactions

cowtowncodercommented, May 1, 2017

Included now for next 2.9.0 version: either 2.9.0.pr4, or, if no more pre-releases made, 2.9.0 itself.

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