Nearly 100,000 developers have used the book version to learn Spring! Spring in Action requires a working knowledge of Java. You’re able to think of your dependencies in terms of what capabilities they provide, rather than in terms of library names. If you’re developing a web application, you’ll add the web starter dependency rather than a laundry list of individual libraries that enable you to write a web application. The book has 5 parts spanning 19 chapters. Part 1 covers the foundational topics of building Spring applications: Spring in Action is an excellent travel companion for the huge landscape that is the Spring Framework." Spring Boot enhances Spring development so much that it’s hard to imagine developing Spring applications without it. For that reason, this book treats Spring and Spring Boot as if they were one and the same. We’ll use Spring Boot as much as possible, and explicit configuration only when necessary. And, because Spring XML configuration is the old-school way of working with Spring, we’ll focus primarily on Spring’s Java-based configuration.

Video description In Video Editions the narrator reads the book while the content, figures, code listings, diagrams, and text appear on the screen. Like an audiobook that you can also watch as a video. 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. 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. Finally, in chapter 19 you’ll see how to deploy your Spring application in a variety of production environments.

Finally, the build specification ends with the Spring Boot plugin. This plugin performs a few important functions: Chapter 5 reveals how to configure a Spring application using Spring Boot configuration properties. You’ll also learn how to selectively apply configuration using profiles. Historically, the way you would guide Spring’s application context to wire beans together was with one or more XML files that described the components and their relationship to other components. For example, the following XML declares two beans, an InventoryService bean and a ProductService bean, and wires the InventoryService bean into ProductService via a constructor argument:

The @Configuration annotation indicates to Spring that this is a configuration class that will provide beans to the Spring application context. The configuration’s class methods are annotated with @Bean, indicating that the objects they return should be added as beans in the application context (where, by default, their respective bean IDs will be the same as the names of the methods that define them). 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. Although all of the projects in the Spring ecosystem provide excellent documentation, this book does something that none of the reference documents do: provide a hands-on, project-driven guide to bringing the elements of Spring together to build a real application. Who should read this book The only book you’ll ever need to learn and master the Spring ecosystem. This update is a must-read. After nearly 15 years of working with Spring and having written five editions of this book (not to mention Spring Boot in Action), you’d think that it’d be hard to come up with something exciting and new to say about Spring when writing the preface for this book. But nothing could be further from the truth!

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The definitive guide for developers wanting to build reliable, fault-tolerant, and scalable cloud-native applications using Spring. Chapter 13 dives into service discovery, using Spring with Netflix’s Eureka registry to both register and discover Spring-based microservices. In addition to the new reactive programming features of Spring 5, Spring Boot 2 now provides even more autoconfiguration support than ever before as well as a completely reimagined Actuator for peeking into and manipulating a running application. 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 in Action, 5th Edition is the fully updated revision of Manning's bestselling Spring in Action. This new edition includes all Spring 5.0 updates, along with new examples on reactive programming, Spring WebFlux, and microservices. You'll also find the latest Spring best practices, including Spring Boot for application setup and configuration.

Chapter 15 introduces the circuit breaker pattern with Hystrix, enabling microservices that are resilient in the face of failure. CRAIG WALLS is a principal engineer with Pivotal. He’s a zealous promoter of the Spring Framework, speaking frequently at local user groups and conferences and writing about Spring. When he’s not slinging code, Craig is planning his next trip to Disney World or Disneyland and spending as much time as he can with his wife, two daughters, two birds, and three dogs. About the cover illustrationIf you’re not a Spring Tool Suite user, that’s fine; we can still be friends. Hop over to the appendix and substitute the Initializr option that suits you best for the instructions in the following sections. But know that throughout this book, I may occasionally reference features specific to Spring Tool Suite, such as the Spring Boot Dashboard. If you’re not using Spring Tool Suite, you’ll need to adapt those instructions to fit your IDE. Part 1 of this book will get you started writing a Spring application, learning the foundations of Spring along the way. 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. Any non-trivial application is composed of many components, each responsible for its own piece of the overall application functionality, coordinating with the other application elements to get the job done. When the application is run, those components somehow need to be created and introduced to each other.