Can't convert JSONArray into a list (Kotlin)

Issue

This is my string:

{"array":[{"message":"test1","name":"test2","creation":"test3"},{"message":"test1","name":"test2","creation":"test3"}]}

And I want it get that array into a list of object in Kotlin app for Android. I tried to do it using two examples from this site... So here is my code (res = that string):

val gson = Gson()
val obj = gson.fromJson(res, JsonObject::class.java)
val arr = obj.getAsJsonArray("array")

println(arr.toString())
val list1 : List<JThread> = gson.fromJson(arr, object : TypeToken<List<JThread>>() {}.type)
val list2 = gson.fromJson(arr, Array<JThread>::class.java).asList()

for (x in list1){
   println(x.message)
}
for (x in list2){
   println(x.message)
}   

However I'm only getting null in x.message. I don't know what can go wrong. I also tried changing arr to arr.toString() everywhere and that didn't work either.

Also JThread is:

object JThread {
var message: String? = null
var name: String? = null
var creation: String? = null }     

Solution

Use this code:

import com.google.gson.annotations.SerializedName
import com.google.gson.Gson

data class Array(
    @SerializedName("message")
    var message: String,
    @SerializedName("name")
    var name: String,
    @SerializedName("creation")
    var creation: String
)

data class Example(
    @SerializedName("array")
    var array: List<Array>? = null
)

private fun fromJson(json:String):Example{
    return Gson().fromJson<Example>(json, Example::class.java)
}

PS: I made it with this site:http://www.jsonschema2pojo.org/

Answered By - samaromku