Book Image

Learning Spring Boot 2.0 - Second Edition

By : Greg L. Turnquist, Greg L. Turnquist
Book Image

Learning Spring Boot 2.0 - Second Edition

By: Greg L. Turnquist, Greg L. Turnquist

Overview of this book

Spring Boot provides a variety of features that address today's business needs along with today's scalable requirements. In this book, you will learn how to leverage powerful databases and Spring Boot's state-of-the-art WebFlux framework. This practical guide will help you get up and running with all the latest features of Spring Boot, especially the new Reactor-based toolkit. The book starts off by helping you build a simple app, then shows you how to bundle and deploy it to the cloud. From here, we take you through reactive programming, showing you how to interact with controllers and templates and handle data access. Once you're done, you can start writing unit tests, slice tests, embedded container tests, and even autoconfiguration tests. We go into detail about developer tools, AMQP messaging, WebSockets, security, and deployment. You will learn how to secure your application using both routes and method-based rules. By the end of the book, you'll have built a social media platform from which to apply the lessons you have learned to any problem. If you want a good understanding of building scalable applications using the core functionality of Spring Boot, this is the book for you.
Table of Contents (11 chapters)

Using Spring Boot's DevTools for hot code reloading

Developers are always looking for ways to speed things up. Long ago, one of the biggest speedups was incremental compilers and having them run every time we saved a file. Now that it's permeated modern tools, no one thinks twice about such a feature.

Something critically needed when it comes to building Spring Boot apps is the ability to detect a change in our code and relaunch the embedded container.

Thankfully, we just need one addition to our code we built in the previous chapter:

If you happen to be using Maven, you would want to include the optional flag.

So, this tiny module performs the following activities:

  • Disables cache settings for autoconfigured components
  • When it detects a change in code, it restarts the application, holding onto third...