How do I deserialize JSON into a List with Kotlin + Jackson [duplicate]

Answer 1

Following code works well for me:

import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import com.fasterxml.jackson.module.kotlin.registerKotlinModule



val json = """[ {
  "id" : "1",
  "name" : "Blues"
}, {
  "id" : "0",
  "name" : "Rock"
} ]"""

data class GenreDTO(val id: Int, val name: String)

val mapper = ObjectMapper().registerKotlinModule()

fun main(args: Array) {
    val obj: List = mapper.readValue(json)
    obj.forEach {
        println(it)
    }
}

This work because of extension function defined inside jackson-kotlin-module (that used reified generics):

 public inline fun  ObjectMapper.readValue(content: String): T = readValue(content, object: TypeReference() {})

Thanks @JaysonMinard for notify me about it.

Output:

GenreDTO(id=1, name=Blues)
GenreDTO(id=0, name=Rock)