I'm trying to compile with generic classes like in...

# serialization

[Amaan]

I'm trying to compile with generic classes like in the documentation, but I can't seem to get it to work. https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/basic-serialization.md#generic-classes

[Amaan]

Here is what my code looks like in my scratch.kts file when I try to follow along:

import kotlinx.serialization.Serializable
import kotlinx.serialization.encodeToString
import kotlinx.serialization.json.Json

@Serializable
class Box<T>(val contents: T)

@Serializable
class Data(
    val a: Box<Int>,
    val b: Box<String>
)

val data = Data(Box(42), Box("Kotlin"))
println(Json.encodeToString(data))

[Amaan]

And this is my error output:

Exception in thread "main" kotlinx.serialization.SerializationException: Serializer for class 'Data' is not found.
Mark the class as @Serializable or provide the serializer explicitly.
	at kotlinx.serialization.internal.Platform_commonKt.serializerNotRegistered(Platform.common.kt:91)
	at kotlinx.serialization.internal.PlatformKt.platformSpecificSerializerNotRegistered(Platform.kt:29)
	at kotlinx.serialization.SerializersKt__SerializersKt.serializer(Serializers.kt:60)
	at kotlinx.serialization.SerializersKt.serializer(Unknown Source)
	at org.jetbrains.kotlin.idea.scratch.generated.ScratchFileRunnerGenerated$ScratchFileRunnerGenerated.generated_get_instance_res0(tmp.kt:39)
	at org.jetbrains.kotlin.idea.scratch.generated.ScratchFileRunnerGenerated.main(tmp.kt:30)

[Oliver.O]

Did you forget to configure the Gradle plugin (in addition to the library dependency)? A multiplatform example:

plugins {
    kotlin("multiplatform") version "1.6.10"
    kotlin("plugin.serialization") version "1.6.10"
    application
}

[Amaan]

I already have it working for non-generics since I'm using it in Ktor.

[Oliver.O]

I have verified that your code compiled and runs fine with a Gradle build configured as described above.