Book Image

Learning Spring Boot 3.0 - Third Edition

By : Greg L. Turnquist
Book Image

Learning Spring Boot 3.0 - Third Edition

By: Greg L. Turnquist

Overview of this book

Spring Boot 3 brings more than just the powerful ability to build secure web apps on top of a rock-solid database. It delivers new options for testing, deployment, Docker support, and native images for GraalVM, along with ways to squeeze out more efficient usage of existing resources. This third edition of the bestseller starts off by helping you build a simple app, and then shows you how to secure, test, bundle, and deploy it to production. Next, you’ll familiarize yourself with the ability to go “native” and release using GraalVM. As you advance, you’ll explore reactive programming and get a taste of scalable web controllers and data operations. The book goes into detail about GraalVM native images and deployment, teaching you how to secure your application using both routes and method-based rules and enabling you to apply the lessons you’ve learned to any problem. If you want to gain a thorough understanding of building robust applications using the core functionality of Spring Boot, then this is the book for you. By the end of this Spring Boot book, you’ll be able to build an entire suite of web applications using Spring Boot and deploy them to any platform you need.
Table of Contents (17 chapters)
1
Part 1: The Basics of Spring Boot
3
Part 2: Creating an Application with Spring Boot
8
Part 3: Releasing an Application with Spring Boot
12
Part 4: Scaling an Application with Spring Boot

Writing Reactive
Web Controllers

In the previous eight chapters, we gathered up all the key components needed to build a Spring Boot application. We bundled it inside a Docker container and even tweaked it to run in native mode on GraalVM instead of the standard JVM.

But what if, after doing all this, our application still suffered from a lot of idle time? What if our application was burning up our cloud bill due to having to host a huge number of instances just to meet our present needs?

In other words, is there another way to squeeze a lot more efficiency out of the whole thing, without letting go of Spring Boot?

Welcome to Spring Boot and reactive programming!

In this chapter, we’ll cover the following topics:

  • Discovering exactly what reactive programming is and why we should care
  • Creating a reactive Spring Boot application
  • Serving data with a reactive GET method
  • Consuming incoming data with a reactive POST method
  • Serving a reactive template...