Spring Boot and Kotlin is a powerful combination for modern Java programming. This guide provides an introduction to integrating Spring Boot with Kotlin, explains the benefits of Kotlin, and offers sample code with explanations for its implementation.

Why Use Kotlin with Spring Boot?

Kotlin is a concise, expressive, and statically-typed language that offers several advantages when integrated with Spring Boot:

  • Conciseness: Kotlin code is more concise and expressive, reducing boilerplate and improving readability.
  • Null Safety: Kotlin's null safety features help prevent null pointer exceptions, making code more robust.
  • Seamless Java Integration: Kotlin can seamlessly interoperate with existing Java code and libraries, making it an excellent choice for modernizing Java applications.

Getting Started with Spring Boot and Kotlin

To start modern Java programming with Spring Boot and Kotlin, follow these steps:

  1. Create a Spring Boot project using the Spring Initializr or your preferred IDE.
  2. Add the Kotlin dependency to your project's pom.xml (Maven) or build.gradle (Gradle) file:
<!-- Maven -->
// Gradle
dependencies {
implementation 'org.jetbrains.kotlin:kotlin-stdlib'
  1. Create Kotlin classes to define the structure and logic of your Spring Boot application. Kotlin's concise syntax and null safety features will enhance your development process.
// Example Kotlin Class
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication
class MySpringBootApp
fun main() {
  1. You can seamlessly use Kotlin alongside Java classes, allowing gradual adoption and modernization of your Java-based Spring Boot application.


Spring Boot and Kotlin is a modern and powerful combination for Java programming. This guide introduced the integration, explained the benefits of Kotlin, and provided sample code for developing a Spring Boot application using Kotlin. As you explore this combination further, you'll find it valuable for writing concise, robust, and modern Java code.