Spring in Action

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Chapter 13 dives into service discovery, using Spring with Netflix’s Eureka registry to both register and discover Spring-based microservices. The book has 5 parts spanning 19 chapters. Part 1 covers the foundational topics of building Spring applications: 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! Craig Walls is an engineer at VMware, a member of the Spring engineering team, a popular author, and a frequent conference speaker. 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

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. 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 More recently, with the introduction of Spring Boot, automatic configuration has gone well beyond component scanning and autowiring. Spring Boot is an extension of the Spring Framework that offers several productivity enhancements. The most well-known of these enhancements is autoconfiguration, where Spring Boot can make reasonable guesses of what components need to be configured and wired together, based on entries in the classpath, environment variables, and other factors. You may also notice that all three dependencies have the word starter in their artifact ID. Spring Boot starter dependencies are special in that they typically don’t have any library code themselves, but instead transitively pull in other libraries. These starter dependencies offer three primary benefits: Chapter 10 introduces Project Reactor, the reactive programming library that underpins Spring 5’s reactive features.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. 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. The only book you’ll ever need to learn and master the Spring ecosystem. This update is a must-read.

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: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. 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 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 illustration Every single release of Spring, Spring Boot, and all of the other projects in the Spring ecosystem unleashes some new amazing capabilities that rekindle the fun in developing applications. With Spring reaching a significant milestone with its 5.0 release and Spring Boot releasing version 2.0, there’s so much more Spring to enjoy that it was a no-brainer to write another edition of Spring in Action.

Finally, the build specification ends with the Spring Boot plugin. This plugin performs a few important functions: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. Chapter 11 revisits REST API development, introducing Spring WebFlex, a new web framework that borrows much from Spring MVC while offering a new reactive model for web development. Finally, to my beautiful wife Raymie, the love of my life, my sweetest dream, and my inspiration: Thank you for your encouragement and for putting up with another book project. And to my sweet and wonderful girls, Maisy and Madi: I am so proud of you and of the amazing young ladies you are becoming. I love all of you more than you can imagine or I can possible express. About this book

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. 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. 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.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. One of the most amazing things that Spring and Spring Boot do is to automatically provide all of the foundational plumbing for an application, leaving you as a developer to focus primarily on the logic that’s unique to your application. Unfortunately, no such magic exists for writing a book. Or does it? application.properties—This file is initially empty, but offers a place where you can specify configuration properties. We’ll tinker with this file a little in this chapter, but I’ll postpone a detailed explanation of configuration properties to chapter 5. 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).