Kotlin on Google App Engine

Application.kt

package hello

import java.util.Arrays

import org.springframework.boot.CommandLineRunner
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation.Bean

@SpringBootApplication
open class Application {
    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            SpringApplication.run(Application::class.java, *args)
        }
    }
}

HelloController.kt

package hello

import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RestController

@RestController
class HelloController {
    @RequestMapping("/")
    fun index(): String {
        return "Greetings from Spring Boot!"
    }
}