kotlin

Type mismatch when serializing data class

I'm following this example to serialize a data class. When I do so, I get this build error:

Type mismatch: inferred type is Data but SerializationStrategy<TypeVariable(T)> was expected

Here's my code:

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

@Serializable
data class Data(val a: Int, val str: String = "str")

fun main() {
    println(Json.encodeToString(Data(42)))
}

Since I am using the @Serializable annotation, shouldn't I have the right data type? How can I serialize the data class?

Solution

  • The function that only requires the value parameter is implemented as an extension function, so you need to add import

    import kotlinx.serialization.encodeToString

    To make it clear: instead of

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

    you must write

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