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

Creating a reactive data repository

Earlier in Chapter 3, Querying for Data with Spring Boot, we built an easy-to-read data repository by extending JpaRepository from Spring Data JPA. For Spring Data R2DBC, let’s write something like this:

public interface EmployeeRepository extends //
  ReactiveCrudRepository<Employee, Long> {}

This code can be described as follows:

  • EmployeeRepository: The name for our Spring Data repository.
  • ReactiveCrudRepository: Spring Data Commons’ base interface for any reactive repository. Note that this isn’t specific to R2DBC but instead for ANY reactive Spring Data module.
  • Employee: The domain type for this repository (which we’ll code further in the chapter).
  • Long: The primary key’s type.

In the previous chapter, we scratched together an Employee domain type using a Java 17 record. However, to interact with our database, we need something a little more detailed than that...