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

Summary

In this chapter, we learned how to externalize parts of our system from content that appears in the web layer to the list of users allowed to authenticate with the system. We saw how to create type-safe configuration classes, bootstrap them from property files, and then inject them into parts of our application. We even saw how to use profile-based properties and choose between using traditional Java property files or using YAML. We then explored even more ways to override property settings from the command line and checked out a comprehensive list of yet more ways to override properties.

While our examples were probably not as realistic as they could have been, the concept is there. Externalizing properties that are likely to vary from environment to environment is a valuable feature, and Spring Boot eases the usage of this pattern.

In the next chapter, Releasing an Application with Spring Boot, we are finally going to release our application into the wild. There, we...