Spring in Action

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Java-based configuration offers several benefits over XML-based configuration, including greater type safety and improved refactorability. Even so, explicit configuration with either Java or XML is only necessary if Spring is unable to automatically configure the components. The only book you’ll ever need to learn and master the Spring ecosystem. This update is a must-read.

This book contains many examples of source code both in numbered listings and inline with normal text. In both cases, source code is formatted in a fixed-width font like this to separate it from ordinary text. Sometimes code is also in bold to highlight code that has changed from previous steps in the chapter, such as when a new feature adds to an existing line of code.Chapter 8 looks at using asynchronous communication to enable a Spring application to both send and receive messages using the Java Message Service, RabbitMQ, or Kafka. Your build file will be significantly smaller and easier to manage because you won’t need to declare a dependency on every library you might need.

Finally, in chapter 19 you’ll see how to deploy your Spring application in a variety of production environments. Chapter 1 introduces Spring and Spring Boot and how to initialize a Spring project. In this chapter, you’ll take the first steps toward building a Spring application that you’ll expand upon throughout the course of the book. Craig Walls is an engineer at VMware, a member of the Spring engineering team, a popular author, and a frequent conference speaker. Spring Framework makes life easier for Java developers. New features in Spring 5 bring its productivity-focused approach to microservices, reactive development, and other modern application designs. With Spring Boot now fully integrated, you can start even complex projects with minimal configuration code. And the upgraded WebFlux framework supports reactive apps right out of the box!

Spring is required knowledge for Java developers! Why? This powerful framework eliminates a lot of the tedious configuration and repetitive coding tasks, making it easy to build enterprise-ready, production-quality software. The latest updates bring huge productivity boosts to microservices, reactive development, and other modern application designs. It’s no wonder over half of all Java developers use Spring. about the book Automatic configuration has its roots in the Spring techniques known as autowiring and component scanning. With component scanning, Spring can automatically discover components from an application’s classpath and create them as beans in the Spring application context. With autowiring, Spring automatically injects the components with the other beans that they depend on. In general, developers new to Spring should start with chapter 1 and work through each chapter sequentially. Experienced Spring developers may prefer to jump in at any point that interests them. Even so, each chapter builds upon the previous chapter, so there may be some context missing if you dive into the middle of the book. About the code You may recognize this as a typical Maven or Gradle project structure, where application source code is placed under src/main/java, test code is placed under src/test/java, and non-Java resources are placed under src/main/resources. Within that project structure, you’ll want to take note of these items: Chapter 6 expands on the discussion of Spring MVC started in chapter 2 by looking at how to write REST APIs in Spring.

The act of wiring beans together is based on a pattern known as dependency injection (DI). Rather than have components create and maintain the lifecycle of other beans that they depend on, a dependency-injected application relies on a separate entity (the container) to create and maintain all components and inject those into the beans that need them. This is done typically through constructor arguments or property accessor methods. mvnw and mvnw.cmd—These are Maven wrapper scripts. You can use these scripts to build your project even if you don’t have Maven installed on your machine. Chapter 10 introduces Project Reactor, the reactive programming library that underpins Spring 5’s reactive features.

As for the dependencies themselves, you can either expand the various sections and seek out the desired dependencies manually, or search for them in the search box at the top of the Available list. For the Taco Cloud application, you’ll start with the dependencies shown in figure 1.4.

Chapter 13 dives into service discovery, using Spring with Netflix’s Eureka registry to both register and discover Spring-based microservices. TacoCloudApplication.java—This is the Spring Boot main class that bootstraps the project. We’ll take a closer look at this class in a moment. You’re freed from the burden of worry about library versions. You can trust that for a given version of Spring Boot, the versions of the libraries brought in transitively will be compatible. You only need to worry about which version of Spring Boot you’re using. Craig Walls is an engineer at VMware, a member of the Spring engineering team, a popular author, and a frequent conference speaker. The best resource for modern Spring development. At Manning, there were several people working their magic to make sure that this book is the best it can possibly be. Many thanks in particular to Jenny Stout, my development editor, and to the production team, including project manager Janet Vail, copyeditors Andy Carroll and Frances Buran, and proofreaders Katie Tennant and Melody Dolab. Thanks, too, to technical proofer Joshua White who was thorough and helpful.

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After the project loads in the IDE, expand it to see what it contains. Figure 1.6 shows the expanded Taco Cloud project in Spring Tool Suite. Nearly 100,000 developers have used the book version to learn Spring! Spring in Action requires a working knowledge of Java. The figure on the cover of Spring in Action, 5th edition, is Le Caraco, or an inhabitant of the province of Karak in southwest Jordan. Its capital is the city of Al-Karak, which boasts an ancient hilltop castle with magnificent views of the Dead Sea and surrounding plains. The illustration is taken from a French travel book, Encyclopédie des Voyages by J. G. St. Sauveur, published in 1796. Travel for pleasure was a relatively new phenomenon at the time and travel guides such as this one were popular, introducing both the tourist as well as the armchair traveler to the inhabitants of other regions of France and abroad.