SpringExample.kt

@SpringBootApplication
class Application

fun main(args: Array<String>) {
    SpringApplication.run(Application::class.java, *args)
}

data class Greeting(val id: Long, val content: String)

@RestController
class GreetingController {

    val counter = AtomicLong()

    @GetMapping("/greeting")
    fun greeting(@RequestParam(value = "name", defaultValue = "World") name: String) =
            Greeting(counter.incrementAndGet(), "Hello, $name")

}