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

Integrating with a relational database using an ORM (Hibernate) framework

An ORM framework enables you to store, query, or manipulate data using the object-oriented paradigm. It provides an object-oriented approach to access the data from the database or, in other words, instead of using SQL, you can use Java objects to interact with the database.

In Java, as a standard specification, the Java Persistence API (JPA) specifies the following:

  • Which Java objects ought to be persisted
  • How these objects should be persisted

JPA is not a framework or tool but it dictates the standard protocol and covers the core concepts of what to persist and how to persist. Various implementing frameworks such as Hibernate and EclipseLink have adopted these JPA standards. We will be using Hibernate as our ORM framework.

To get hands-on with Hibernate in the Micronaut framework, we will work on the small pet-clinic application and, specifically for Hibernate, we will focus on the...