Add kotlin-functional sample

Related to https://github.com/spring-projects/spring-framework/issues/29211

kotlin-functional/build.gradle

@@ -0,0 +1,21 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot'
+	id 'org.springframework.aot.smoke-test'
+	id 'org.graalvm.buildtools.native'
+	id 'org.jetbrains.kotlin.jvm'
+	id 'org.jetbrains.kotlin.plugin.spring' version "1.7.10"
+}
+
+dependencies {
+	implementation(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
+	implementation("org.springframework.boot:spring-boot-starter")
+	implementation("org.jetbrains.kotlin:kotlin-reflect")
+	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+	aotSmokeTestImplementation(project(":aot-smoke-test-support"))
+	aotSmokeTestImplementation("org.awaitility:awaitility:4.2.0")
+}
+

kotlin-functional/src/aotSmokeTest/java/com/example/functional/FunctionalApplicationAotTests.java

@@ -0,0 +1,23 @@
+package com.example.functional;
+
+import java.time.Duration;
+
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.aot.smoketest.support.assertj.AssertableOutput;
+import org.springframework.aot.smoketest.support.junit.AotSmokeTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@AotSmokeTest
+public class FunctionalApplicationAotTests {
+
+	@Test
+	void expectedLoggingIsProduced(AssertableOutput output) {
+		Awaitility.await().atMost(Duration.ofSeconds(10)).untilAsserted(() -> {
+			assertThat(output).hasSingleLineContaining("Hello World");
+		});
+	}
+
+}

kotlin-functional/src/main/kotlin/com/example/functional/FunctionalApplication.kt

@@ -0,0 +1,24 @@
+package com.example.functional
+
+import org.springframework.boot.CommandLineRunner
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+import org.springframework.context.support.beans
+
+@SpringBootApplication
+class FunctionalApplication
+
+fun main(args: Array<String>) {
+	runApplication<FunctionalApplication>(*args) {
+		addInitializers(beans {
+			bean<Foo>()
+		})
+	}
+}
+
+class Foo : CommandLineRunner {
+	override fun run(vararg args: String?) {
+		println("Hello world!")
+	}
+}
+

settings.gradle

@@ -69,6 +69,7 @@ include "freemarker-webflux"
 include "freemarker-webmvc"
 include "hateoas"
 include "integration"
+include "kotlin-functional"
 include "jdbc-h2"
 include "jdbc-mariadb"
 include "jdbc-mysql"