diff --git a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloController.kt b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloController.kt
index 02b57bac5f..69be7dac7e 100644
--- a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloController.kt
+++ b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloController.kt
@@ -4,7 +4,7 @@ import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.RestController
 
 @RestController
-class HelloController constructor(val helloService: HelloService) {
+class HelloController(val helloService: HelloService) {
 
     @GetMapping("/hello")
     fun helloKotlin(): String {
diff --git a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloDto.kt b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloDto.kt
index 3f0139b5a9..f61c101f0f 100644
--- a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloDto.kt
+++ b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloDto.kt
@@ -1,3 +1,3 @@
 package com.baeldung.springbootkotlin
 
-data class HelloDto constructor(val greeting: String)
+data class HelloDto(val greeting: String)
diff --git a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloService.kt b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloService.kt
index c988b64e05..67791a0c2d 100644
--- a/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloService.kt
+++ b/spring-boot-kotlin/src/main/kotlin/com/baeldung/springbootkotlin/HelloService.kt
@@ -4,6 +4,7 @@ import org.springframework.stereotype.Service
 
 @Service
 class HelloService {
+
     fun getHello(): String {
         return "hello service"
     }
diff --git a/spring-boot-kotlin/src/test/kotlin/springbootkotlin/KotlinDemoApplicationTests.kt b/spring-boot-kotlin/src/test/kotlin/springbootkotlin/KotlinDemoApplicationTests.kt
index 15ddc916e2..e0d427e52f 100644
--- a/spring-boot-kotlin/src/test/kotlin/springbootkotlin/KotlinDemoApplicationTests.kt
+++ b/spring-boot-kotlin/src/test/kotlin/springbootkotlin/KotlinDemoApplicationTests.kt
@@ -1,4 +1,4 @@
-package com.example.kotlindemo
+package springbootkotlin
 
 import com.baeldung.springbootkotlin.HelloDto
 import com.baeldung.springbootkotlin.KotlinDemoApplication
@@ -24,7 +24,7 @@ class KotlinDemoApplicationTests {
 
 	@Test
 	fun testHelloController() {
-		var result = testRestTemplate?.getForEntity("/hello", String::class.java)
+		val result = testRestTemplate?.getForEntity("/hello", String::class.java)
 
 		Assert.assertNotNull(result)
 		Assert.assertEquals(result?.statusCode, HttpStatus.OK)
@@ -33,7 +33,7 @@ class KotlinDemoApplicationTests {
 
 	@Test
 	fun testHelloService() {
-		var result = testRestTemplate?.getForEntity("/hello-service", String::class.java)
+		val result = testRestTemplate?.getForEntity("/hello-service", String::class.java)
 
 		Assert.assertNotNull(result)
 		Assert.assertEquals(result?.statusCode, HttpStatus.OK)
@@ -42,7 +42,7 @@ class KotlinDemoApplicationTests {
 
 	@Test
 	fun testHelloDto() {
-		var result = testRestTemplate?.getForEntity("/hello-dto", HelloDto::class.java)
+		val result = testRestTemplate?.getForEntity("/hello-dto", HelloDto::class.java)
 
 		Assert.assertNotNull(result)
 		Assert.assertEquals(result?.statusCode, HttpStatus.OK)