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


We began this chapter with the testing pyramid and striking a fine balance in test automation with unit testing, service testing, and integration testing. We jumpstarted with some basics of unit testing, such as leveraging mocks and spies to write unit tests. We then dived into how we can write service tests to test various RESTful endpoints using a reactive HTTP client in the Micronaut framework. Finally, we explored the exciting world of test containers for integration testing. We wrote integration tests using Testcontainer to instantiate MongoDB in the test environment.

This chapter provides you with a firm understanding of testing at various levels, such as unit, service, or integration in the Micronaut framework. After subtle yet nimble theoretical discussions, we followed up with good hands-on examples to enhance your practical skillset in automated testing in the Micronaut framework.

In the next chapter, we will explore how we can handle microservice architecture...