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

Setting properties with environment variables

A configurable application wouldn’t be complete if there weren’t a way to configure it straight from the command line. This is of key value because no matter how much thought and design we put into our applications, something will always pop up.

Being stuck with a bundled-up application and no way to override the various property files stuffed inside it would be a showstopper.

Don’t do this!

Maybe you’ve run into situations where you need to unpack the JAR file, edit some property files, and bundle it back up. Do not do this! This is a hack that may have skated by 20 years ago, but it just doesn’t cut it today. In today’s age of controlled pipelines and secured release processes, it’s simply too risky to manually get your hands on a JAR file and tweak it like that. And thanks to the real-world experience of the Spring team, there’s no need to do that.

You can easily override...