Super basic Kotlin example with JSON

build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    kotlin("jvm") version "1.2.60"
    application
}

application {
    mainClassName = "HelloKt"
}

group = "net.dryft"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
    jcenter()
}

dependencies {
    compile(kotlin("stdlib-jdk8"))
    implementation("com.beust:klaxon:3.0.1")
}

tasks.withType<KotlinCompile> {
    kotlinOptions.jvmTarget = "1.8"
}

Hello.kt

// src/main/kotlin/Hello.kt

import com.beust.klaxon.Klaxon

fun main(args: Array<String>) {
    println("Hello Kotlin!")
    var item = Klaxon().parse<LineItem>(exampleJson())
    // parse can return null, so you have to refer to item with the null-safety operator:
    println("Nice ${item?.itemId} you've got there")
    item = null
    println("Bad ${item?.itemId} you've got there")
}

data class LineItem(val itemId: String, val price: Float)

fun exampleJson() = """
    {
      "itemId": "suspicious-turnip.345888",
      "price": 34.95
    }
""".trimIndent()