Book Image

Developing Java Applications with Spring and Spring Boot

By : Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Book Image

Developing Java Applications with Spring and Spring Boot

By: Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov

Overview of this book

Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The course is up made of three modules, each one having a take-away relating to building end-to-end java applications. The first module takes the approach of learning Spring frameworks by building applications.You will learn to build APIs and integrate them with popular fraemworks suh as AngularJS, Spring WebFlux, and Spring Data. You will also learn to build microservices using Spring's support for Kotlin. You will learn about the Reactive paradigm in the Spring architecture using Project Reactor. In the second module, after getting hands-on with Spring, you will learn about the most popular tool in the Spring ecosystem-Spring Boot. You will learn to build applications with Spring Boot, bundle them, and deploy them on the cloud. After learning to build applications with Spring Boot, you will be able to use various tests that are an important part of application development. We also cover the important developer tools such as AMQP messaging, websockets, security, and more. This will give you a good functional understanding of scalable development in the Spring ecosystem with Spring Boot. In the third and final module, you will tackle the most important challenges in Java application development with Spring Boot using practical recipes. Including recipes for testing, deployment, monitoring, and securing your applications. This module will also address the functional and technical requirements for building enterprise applications. By the end of the course you will be comfortable with using Spring and Spring Boot to develop Java applications and will have mastered the intricacies of production-grade applications.
Table of Contents (34 chapters)
Title Page - Courses
Copyright and Credits - Courses
Packt Upsell - Courses
Preface
Bibliography
Index

Creating a custom Spring Boot autoconfiguration starter


We have a high-level idea of the process by which Spring Boot decides which configurations to include in the formation of the application context. Now, let's take a stab at creating our own Spring Boot starter artifact, which we can include as an autoconfigurable dependency in our build.

 

In Chapter 21, Configuring Web Applications, you learned how to create database Repository objects. So, let's build a simple starter that will create another CommandLineRunner that will take the collection of all the Repository instances and print out the count of the total entries for each.

We will start by adding a child Gradle project to our existing project that will house the codebase for the starter artifact. We will call it db-count-starter.

How to do it...

  1. We will start by creating a new directory named db-count-starter in the root of our project.
  2. As our project has now become what is known as a multiproject build, we will need to create a settings...