[SOLVED] Parse JSON containing an array of enums in Kotlin with Klaxon

Parse JSON containing an array of enums in Kotlin with Klaxon

I'm new to Kotlin and trying to parse an array of enums from JSON:

val convertColor = object: Converter<Color> {
    override fun toJson(value: Color): String? = when(value) {
        Color.R -> "red"
        Color.G -> "green"
        Color.B -> "blue"
        else -> null
    }

    override fun fromJson(jv: JsonValue): Color = when(jv.inside) {
        "red" -> Color.R
        "green" -> Color.G
        "blue" -> Color.B
        else -> throw IllegalArgumentException("Invalid Color")
    }
}

enum class Color { R, G, B }
data class Root (val colors: Array<Color>)

Then I try to parse a sample with:

val klaxon = Klaxon().converter(convertColor)
val result = klaxon.parse<Root>("""
{
    "colors": ["red", "green", "blue"]
}
""")

But I get this runtime exception:

Exception in thread "main" java.lang.IllegalArgumentException: array element type mismatch

It seems like the converter is not applied to the array elements.

Solution

It works if you replace Array with List, which is recommended anyway:

data class Root(val colors: List<Color>)