Book Image

Hands-On Microservices with Kotlin

By : Juan Antonio Medina Iglesias
Book Image

Hands-On Microservices with Kotlin

By: Juan Antonio Medina Iglesias

Overview of this book

With Google's inclusion of first-class support for Kotlin in their Android ecosystem, Kotlin's future as a mainstream language is assured. Microservices help design scalable, easy-to-maintain web applications; Kotlin allows us to take advantage of modern idioms to simplify our development and create high-quality services. With 100% interoperability with the JVM, Kotlin makes working with existing Java code easier. Well-known Java systems such as Spring, Jackson, and Reactor have included Kotlin modules to exploit its language features. This book guides the reader in designing and implementing services, and producing production-ready, testable, lean code that's shorter and simpler than a traditional Java implementation. Reap the benefits of using the reactive paradigm and take advantage of non-blocking techniques to take your services to the next level in terms of industry standards. You will consume NoSQL databases reactively to allow you to create high-throughput microservices. Create cloud-native microservices that can run on a wide range of cloud providers, and monitor them. You will create Docker containers for your microservices and scale them. Finally, you will deploy your microservices in OpenShift Online.
Table of Contents (14 chapters)

Understanding SpringBootTest

We have learned how easy it is to create microservices using Spring Framework, but now we need to learn how we can test them, and how Spring can help us. First, we will create a small microservice that will later be used for testing. Then, we will understand what is SpringBootTest and how we can test our beans using JUnit. Finally, we will learn how we can test our controller using MockMvc.

Creating a simple microservice

In order to create our microservice, we will use Spring Initializr, as we have been doing in the previous chapters.

We can start by visiting https://start.spring.io/:

Spring Initializr

We have chosen to create a Maven Project using Kotlin and Spring Boot 2.0.0 M7. We choose Group...