Kotlin classes with Json annotations

The adapters don’t work when using Kotlin classes with Json(name = "..") annotations. This is because annotations in Java are not the same as annotations in Kotlin and the adapters find no Json annotation.

The moshi readme states this:

Kotlin classes work with Moshi out of the box, with the exception of annotations. If you need to annotate your Kotlin classes with an @Json annotation or otherwise, you will need to use the moshi-kotlin artifact, and set up Moshi to use its converter factory:

val moshi = Moshi.Builder() .add(KotlinJsonAdapterFactory()) .build()

But this causes the DocumentAdapter to choose KotlinJsonAdapter as dataJsonAdapter instead of a ResourceAdapter, so the serialization to a json output with attributes, relationships, etc doesn’t work.

[Kaned1as]

Another solution: Just annotate them with @field:Json instead of @Json

[bricestacey]

I ran into this same problem. I was able to solve it with the following

    class MoshiJsonNameMapping : JsonNameMapping {
        override fun getJsonName(field: Field): String {
            val foo = field.kotlinProperty?.findAnnotation<Json>()
            return foo?.name ?: field.name
        }
    }