Kotlin and Java are inter-operable, so it's easy to do a trial of Kotlin on just a small part of your codebase.Kotlin can also be used as a scripting language.Otherwise, most of the Kotlin class would have a primary constructor. secondary constructors - if you need more than one constructor, then only you would go for secondary. One of Kotlin’s key features is null-safety, which cleanly deals with null values at compile time rather than bumping into the famous NullPointerException at runtime.Classes are final by default, which corresponds to Effective Java Item 17 - you would need to explicitly put open if you want to make a class inheritable.Kotlin's Data classes are more concise than Java's value classes.Kotlin compiles to bytecode, so it can perform just as well as Java.I have no experience in Kotlin, but what I read and saw on Kotlin code in GitHub projects was definitely worth exploring.Īn important question you might ask is: why Kotlin? Why Kotlin? That's magic of Spring's which is further explained below.

You will notice in the Code Walkthrough section that there is NO controller and NO service class in the project. Kotlin and Spring Boot work well together. I have developed a very simple REST API in Kotlin using Spring Boot, Spring Data, and the H2 in-memory DB. In this article, we are going to talk about Kotlin.

Kotlin github example