I'm trying to parse a Json in a backthread on native using kotlinx.serializer, but it fails with Inv...

# multiplatform

[Jan Stoltman]

I'm trying to parse a Json in a backthread on native using kotlinx.serializer, but it fails with InvalidMutability exception. it used to work just fine with kotlin 1.3.30 and serialization 10.0 but fails at 1.3.41/11.1. Do you guys know if anything important changed in serialization between these two versions?

[Sergioedcigreja]

Are you sure that your expected json from the server matches your Serializable class?
Had an issue were I was expecting the wrong class for the request that I was doing

[Jan Stoltman]

Everything works when I'm on main thread. It looks like serialization might be mutating something frozen

[olonho]

basic JSON parsing with

fun fetchBackground(url: String) {
    val backgroundWorker = Worker.start()
    val future = backgroundWorker.execute(TransferMode.SAFE, { url }) {
       try {
            jsonParser.parseJson(" {\"userId\":1,\"id\":1,\"title\":\"delectus aut autem\",\"completed\":false} ")
        } catch (e: SerializationException) {
            JsonPrimitive("<error: ${e.message}>")
        }
    }
    println(future.result.jsonObject["id"])
    backgroundWorker.requestTermination().result
}

seems to work. But parsing to data class may have issues, planned to be fixed in next release.

[Jan Stoltman]

Yeah, I’m talking about parsing data classes with @serializable annotation. Is there any info on when next release can be expected?