Book Image

Building Microservices with Micronaut®

By : Nirmal Singh, Zack Dawood
Book Image

Building Microservices with Micronaut®

By: Nirmal Singh, Zack Dawood

Overview of this book

The open source Micronaut® framework is a JVM-based toolkit designed to create microservices quickly and easily. This book will help full-stack and Java developers build modular, high-performing, and reactive microservice-based apps using the Micronaut framework. You'll start by building microservices and learning about the core components, such as ahead-of-time compilation, reflection-less dependency injection, and reactive baked-in HTTP clients and servers. Next, you will work on a real-time microservice application and learn how to integrate Micronaut projects with different kinds of relational and non-relational databases. You'll also learn how to employ different security mechanisms to safeguard your microservices and integrate microservices using event-driven architecture in the Apache Kafka ecosystem. As you advance, you'll get to grips with automated testing and popular testing tools. The book will help you understand how you can easily handle microservice concerns in Micronaut projects, such as service discovery, API documentation, distributed configuration management, fallbacks, and circuit breakers. Finally, you'll explore the deployment and maintenance aspects of microservices and get up to speed with the Internet of Things (IoT) using the Framework. By the end of this book, you'll be able to build, test, deploy, and maintain your own microservice apps using the framework.
Table of Contents (20 chapters)
Section 1: Core Concepts and Basics
Section 2: Microservices Development
Section 3: Microservices Testing
Section 4: Microservices Deployment
Section 5: Microservices Maintenance
Section 6: IoT with Micronaut and Closure

Integration testing using Testcontainers

Testcontainers is a Java library that elegantly marries the world of testing with Docker virtualization. Using the Testcontainers library, we can set up, instantiate, and inject any Docker container into the testing code. This approach opens up many avenues for performing integration testing. In the test suite or test method setup, we can boot up a Dockerized database, Kafka or email server or any integrating app, perform the integration tests, and destroy the Dockerized app in the cleanup. With this pattern, we are up close to the production environment while not impacting the environment with any after-testing side effects.

To learn how we can use the Testcontainers library, we will experiment on the pet-clinic-reviews microservice that integrates with MongoDB. In the next section, we will begin setting up Testcontainers in the Micronaut application.

Setting up the Testcontainers in the Micronaut application

To use Testcontainers...