https://stackoverflow.com/questions/49936982/spring-kotlin-dsl-get-all-beans-of-certain-type

Kotlin-dsl-spring.kt

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.CommandLineRunner
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.builder.SpringApplicationBuilder
import org.springframework.context.support.beans
import org.springframework.stereotype.Component

interface Yoyo {
    fun haha() {
        println("hello world")
    }
}

@Component class Yoyo1 : Yoyo
@Component class Yoyo2 : Yoyo
@Component class Yoyo3 : Yoyo
@Component class YoyoN : Yoyo


@SpringBootApplication
class YoyoApp

fun main(args: Array<String>) {
    SpringApplicationBuilder()
            .sources(YoyoApp::class.java)
            .initializers(beans {
               bean {
                   CommandLineRunner {
                       val y1 = ref<Yoyo1>()
                       val y2 = ref<Yoyo2>()
                       val y3 = ref<Yoyo3>()
                       val yN = ref<YoyoN>()
                       arrayOf(y1, y2, y3, yN).forEach { it.haha() }
                   }
               }
            })
            .run(*args)
}

@Component
class Hoho : CommandLineRunner {
    @Autowired
    lateinit var list: List<Yoyo>

    override fun run(vararg args: String?) {
        list.forEach { it.haha() }
    }
}