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

Tweaking things in production

An application isn’t really in production until we need to start tweaking it, fiddling with it, and making adjustments after release.

This is the very nature of operations. And the various members of the Spring team are no strangers to the world of production.

There are multiple things we can tune and adjust after being handed either an uber JAR or a container. Assuming we have an uber JAR built out of this chapter’s code, we can easily type something like this:

% java -jar target/ch7-0.0.1-SNAPSHOT.jar

This would launch the app with all its default settings, including the standard servlet port of 8080.

But what if we needed it to run next to another Spring Boot web application we just installed yesterday? That suggests we’d need it to listen on a different port. Say no more. All we need do is run a slightly different command, like this:

% SERVER_PORT=9000 java -jar target/ch7-0.0.1-SNAPSHOT.jar
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2022-11...