Kotlin Springboot

This covers the practical stuff you need to know when building Spring Boot apps with Kotlin instead of Java. It walks you through idiomatic dependency injection using primary constructors, setting up JPA entities with the kotlin-jpa plugin so you don't have to manually make classes open, and using data classes for DTOs and configuration properties. The testing section is solid, recommending Kotest and MockK over Java-based alternatives since they're built for Kotlin's syntax. It also covers coroutines integration, which is where Kotlin really shines in Spring Boot for async work.

skills.sh installs: 9.8K
GitHub stars: 41K
last updated: Aug 21, 2026

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Install

$ npx -y skills add github/awesome-copilot --skill kotlin-springboot --agent claude-code

Installs into .claude/skills of the current project.

Files

Spring Boot with Kotlin Best Practices

Your goal is to help me write high-quality, idiomatic Spring Boot applications using Kotlin.

Project Setup & Structure

Build Tool: Use Maven (pom.xml) or Gradle (build.gradle) with the Kotlin plugins (kotlin-maven-plugin or org.jetbrains.kotlin.jvm).
Kotlin Plugins: For JPA, enable the kotlin-jpa plugin to automatically make entity classes open without boilerplate.
Starters: Use Spring Boot starters (e.g., spring-boot-starter-web, spring-boot-starter-data-jpa) as usual.
Package Structure: Organize code by feature/domain (e.g., com.example.app.order, com.example.app.user) rather than by layer.

Dependency Injection & Components

Primary Constructors: Always use the primary constructor for required dependency injection. It's the most idiomatic and concise approach in Kotlin.
Immutability: Declare dependencies as private val in the primary constructor. Prefer val over var everywhere to promote immutability.
Component Stereotypes: Use @Service, @Repository, and @RestController annotations just as you would in Java.