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 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. It ensures that all dependency libraries are included within the executable JAR file and available on the runtime classpath.

The way we develop applications today is different than it was a year ago, 5 years ago, 10 years ago, and certainly 15 years ago, when an initial form of the Spring Framework was introduced in Rod Johnson’s book, Expert One-on-One J2EE Design and Development (Wrox, 2002, http://mng.bz/oVjy). You’ll find several options for initializing a Spring application. Although I could walk you through the steps of manually creating a project directory structure and defining a build specification, that’s wasted time—time better spent writing application code. Therefore, you’re going to lean on the Spring Initializr to bootstrap your application. Figure 1.1. Application components are managed and injected into each other by the Spring application context.

about the book

Chapter 10 introduces Project Reactor, the reactive programming library that underpins Spring 5’s reactive features. After ten years, this is still the clearest and most comprehensive introduction to the core concepts of the Spring platform. Finally, in chapter 19 you’ll see how to deploy your Spring application in a variety of production environments.

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 Recognizing the importance of preserving what has been written, it is Manning’s policy to have the books we publish printed on acid-free paper, and we exert our best efforts to that end. Recognizing also our responsibility to conserve the resources of our planet, Manning books are printed on paper that is at least 15 percent recycled and processed without the use of elemental chlorine. 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. 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.

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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. 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. To get started with a new Spring project in Spring Tool Suite, go to the File menu and select New, and then Spring Starter Project. Figure 1.2 shows the menu structure to look for.

But enough of this chitchat, yakety-yak, and flimflam. This book’s title includes the phrase in action, so let’s get moving, and you can start writing your first application with Spring. 1.2. Initializing a Spring application What’s more, as developers look to break down their monolithic applications into discrete microservices, Spring Cloud provides facilities that make it easy to configure and discover microservices, as well as fortify them so they’re more resilient to failure. Chapter 15 introduces the circuit breaker pattern with Hystrix, enabling microservices that are resilient in the face of failure.

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Spring is the 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. As always, there’d be absolutely no point in writing this book if it weren’t for the amazing work done by the members of the Spring engineering team. I’m amazed at what you’ve created and how we continue to change how software is developed.