BAEL-755 Kotlin and Spring Boot 2.x tutorial

spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloController.kt

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+package com.baeldung.springbootkotlin
+
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+class HelloController @Autowired constructor(val helloService: HelloService) {
+
+    @GetMapping("/hello")
+    fun helloKotlin(): String {
+        return "hello world"
+    }
+
+    @GetMapping("/hello-service")
+    fun helloKotlinService(): String {
+        return helloService.getHello()
+    }
+
+    @GetMapping("/hello-poko")
+    fun helloPoko(): HelloPoko {
+        return HelloPoko("Hello from the poko")
+    }
+}

spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloPoko.kt

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+package com.baeldung.springbootkotlin
+
+data class HelloPoko constructor(val greeting: String)

spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloService.kt

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+package com.baeldung.springbootkotlin
+
+import org.springframework.stereotype.Service
+
+@Service
+class HelloService {
+    fun getHello(): String {
+        return "hello service"
+    }
+}

spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/KotlinDemoApplication.kt

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+package com.baeldung.springbootkotlin
+
+import org.springframework.boot.SpringApplication
+import org.springframework.boot.autoconfigure.SpringBootApplication
+
+@SpringBootApplication
+class KotlinDemoApplication
+
+fun main(args: Array<String>) {
+    SpringApplication.run(KotlinDemoApplication::class.java, *args)
+}

spring-boot-kotlin/src/test/kotlin/springbootkotlin/KotlinDemoApplicationTests.kt

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+package com.example.kotlindemo
+
+import com.baeldung.springbootkotlin.HelloPoko
+import com.baeldung.springbootkotlin.KotlinDemoApplication
+import org.junit.Assert
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.test.web.client.TestRestTemplate
+import org.springframework.http.HttpStatus
+import org.springframework.test.context.junit4.SpringRunner
+
+@RunWith(SpringRunner::class)
+@SpringBootTest(classes = arrayOf(KotlinDemoApplication::class), webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class KotlinDemoApplicationTests {
+
+	@Autowired
+	val testRestTemplate: TestRestTemplate? = null
+
+	@Test
+	fun contextLoads() {
+	}
+
+	@Test
+	fun testHelloController() {
+		var result = testRestTemplate?.getForEntity("/hello", String::class.java)
+
+		Assert.assertNotNull(result)
+		Assert.assertEquals(result?.statusCode, HttpStatus.OK)
+		Assert.assertEquals(result?.body, "hello world")
+	}
+
+	@Test
+	fun testHelloService() {
+		var result = testRestTemplate?.getForEntity("/hello-service", String::class.java)
+
+		Assert.assertNotNull(result)
+		Assert.assertEquals(result?.statusCode, HttpStatus.OK)
+		Assert.assertEquals(result?.body, "hello service")
+	}
+
+	@Test
+	fun testHelloPoko() {
+		var result = testRestTemplate?.getForEntity("/hello-poko", HelloPoko::class.java)
+
+		Assert.assertNotNull(result)
+		Assert.assertEquals(result?.statusCode, HttpStatus.OK)
+		Assert.assertEquals(result?.body, HelloPoko("Hello from the poko"))
+	}
+
+}