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kotlinlang

<@UVAR0DXP0> <https://kotlinlang.slack.com/archives/C0B8ZTWE4/p1634020951040300?thread_ts=1633847081.037300&amp;cid=C0B8ZTWE4> interesting example, I guess I never tried with `Int`. with `String` you get an exception, I guess it might be the compiler unwrapping `Int` to `integer` (compared to `Integer` ), where `null == 0` also in plain java.

your second example needs a bit of configuration of the kotlin module,
```jacksonObjectMapper().registerModule(KotlinModule(nullIsSameAsDefault = true))```
(moved we don’t spam uninterested people)

actually no, tried out and even with kotlin module configured it `Int` becomes `0` :thinking_face:

Also seems like `value class` is not possible to use with jackson? :thinking_face:

image.png

This fails with something about object, creator.. changed branch and nuked the sample before copying the exception..

value classes work, just used my first one with jackson last week. but as the channel hints, I am within spring, there might me some extra configuration that is automatically added

tbf, when I want to configure object mapper manually I do `ObjectMapper().findAndRegisterModules()` , no idea why jetbrains and spring goes “manual”, as jackson already provides an automatic way for scan

Ah, okay.. so just missing some config :thumbsup: