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kotlinlang

Is there any way to use `value class`es with jackson? (Especially with Micronaut...)

The experimental project I am creating covers some use cases (but I have not confirmed that it will work with `Micronaut`).
<https://github.com/ProjectMapK/jackson-module-kogera>

However, please note that perfect support is not possible unless `Kotlin` provides the functionality for compatibility.
See also the following issue.
<https://github.com/FasterXML/jackson-module-kotlin/issues/650>

It would have been nice if one of there adapters would just use KSP to generate what's needed instead of reflection or kotlin metadata... then even the value class problems wouldn't exist... Micronaut generates some kind of classes to avoid reflection too (with the `@Introspected` annotation), but obviously they don't really support Kotlin too much... since it's mostly java.

But at least somebody's trying :smiley:! Just "expiremental project" is a bit scary to be using for production.

&gt; KSP
Perfect support for `value class` is unrealistic as far as `Jackson` is concerned.
The main reason is that the code generated by `value class` will interfere with the analysis by `Jackson`.

&gt; Just "expiremental project" is a bit scary to be using for production.
Yes, I do not recommend using this project for production code.
However, the results obtained by this project will be reflected in `jackson-module-kotlin` and `Kotlin`, so active experimentation would be greatly appreciated.

Is the issue just reading? In my experience writing value classes is working just fine

This is not to say that there are no issues in serialization.
Compared to deserialization, it works correctly in many cases, but there are a few issues that are difficult to fix.