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#serialization
    m

    marstran

    2 years ago
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    I have a data class in a module that is not dependent on kotlinx.serialization. Is there an easy way to make that class serializable in another module, without having to manually write the serializer?
    Dominaezzz

    Dominaezzz

    2 years ago
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    Yes! Let me find you an example!
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    https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/custom_serializers.md#external-serializers-for-library-classes
    m

    marstran

    2 years ago
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    Cool, thanks 🙂 But for some reason I’m getting this error while compiling: “java.lang.IllegalStateException: Class ColourEffect have constructor parameters which are not properties and therefore it is not serializable automatically”. I did this:
    @Serializer(forClass = ColourEffect::class)
object ColourEffectSerializer {}

@Serializable
data class Wrapper(@Serializable(with = ColourEffectSerializer::class) val colourEffect: ColourEffect)
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    And ColourEffect looks like this:
    data class ColourEffect(
    val u: Int,
    val v: Int
) {

    init {
        require(u in 0..255)
        require(v in 0..255)
    }

}
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    Any idea why that happens?
    Dominaezzz

    Dominaezzz

    2 years ago
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    Hmm, no idea.
    m

    marstran

    2 years ago
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    Almost feels like a bug. I made a data class in the same module and created a serializer for it the same way, and that worked well.
    n

    Nagarajan

    2 years ago
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    I was also facing same issue. Try UseSerializer file annotation that's kinda solved the issue
    m

    marstran

    2 years ago
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    @Nagarajan Oh, thanks. I’ll try that.
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