Kotlin hierarchy

fun main() {
    val mapper = jacksonObjectMapper()
    val personData = MainDataData("name", "surname", 19)
    val foo = Foo(personData, "foo")
    val bar = Bar(personData, "bar")
    println(mapper.writeValueAsString(foo))
    println(mapper.writeValueAsString(bar))
}

interface MainData {
    val name: String
    val surname: String
    val age: Int
}

data class MainDataData(
    override val name: String,
    override val surname: String,
    override val age: Int
) : MainData

data class Foo(
    @field:JsonUnwrapped
    val data: MainData,
    val foo: String
) : MainData by data

data class Bar(
    @field:JsonUnwrapped
    val data: MainData,
    val bar: String
) : MainData by data