Craig Walls - Spring Boot in Action
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- Book:Spring Boot in Action
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- Year:2016
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Spring Boot in Action: summary, description and annotation
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Summary
A developer-focused guide to writing applications using Spring Boot. Youll learn how to bypass the tedious configuration steps so that you can concentrate on your applications behavior.
Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications.
About the Technology
The Spring Framework simplifies enterprise Java development, but it does require lots of tedious configuration work. Spring Boot radically streamlines spinning up a Spring application. You get automatic configuration and a model with established conventions for build-time and runtime dependencies. You also get a handy command-line interface you can use to write scripts in Groovy. Developers who use Spring Boot often say that they cant imagine going back to hand configuring their applications.About the Book
Spring Boot in Action is a developer-focused guide to writing applications using Spring Boot. In it, youll learn how to bypass configuration steps so you can focus on your applications behavior. Spring expert Craig Walls uses interesting and practical examples to teach you both how to use the default settings effectively and how to override and customize Spring Boot for your unique environment. Along the way, youll pick up insights from Craigs years of Spring development experience.
Whats Inside
- Develop Spring apps more efficiently
- Minimal to no configuration
- Runtime metrics with the Actuator
- Covers Spring Boot 1.3
About the Reader
Written for readers familiar with the Spring Framework.
About the Author
Craig Walls is a software developer, author of the popular book Spring in Action, Fourth Edition, and a frequent speaker at conferences.Table of Contents
- Bootstarting Spring
- Developing your first Spring Boot application
- Customizing configuration
- Testing with Spring Boot
- Getting Groovy with the Spring Boot CLI
- Applying Grails in Spring Boot
- Taking a peek inside with the Actuator
- Deploying Spring Boot applications APPENDIXES
- Spring Boot developer tools
- Spring Boot starters
- Configuration properties
- Spring Boot dependencies
Craig Walls: author's other books
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Thank you for purchasing the MEAP for Spring Boot in Action. If you're new to the Spring framework, you'll find that Spring Boot will help you get up to speed quickly. On the other hand, if you're a seasoned Spring developer, you'll enjoy the optimized programming model that Spring Boot offers, helping you get more done faster.
Even after having written four editions of Spring in ActionSpring in Action, I'm still excited about what Spring has to offer. But one thing that has been a near-constant has been the configuration code required to make Spring work. Whether it be XML-based configuration or Java configuration, there has always been a sizable amount of framework configuration necessary. Add to that the Maven or Gradle specification needed to build a project and you find that there's plenty of plumbing code that distracts from writing the code that provides business functionality.
Spring Boot changes all of that. Its central feature is automatic configuration. Spring Boot is able to make reasonable guesses about what it is that you are trying to do and automatically apply the Spring configuration necessary to support it. For some applications, it's possible to have no Spring configuration whatsoever. And in all applications, the amount of Spring configuration required is greatly reduced.
Spring Boot in Action will guide you in how to take advantage of auto-configuration and, when necessary, how to override it with custom configuration. You'll also see how to use Spring Boot starters, aggregate build dependencies that focus on what kind of application you want to build instead of specific library requirements. And you'll see how to use some of the production services offered by Spring Boot's Actuator.
Spring Boot is one of the most exciting things to happen in the Spring ecosystem since Spring itself emerged. And I'm excited to introduce it to you.
Your feedback is important and will help me produce the best book possible. So please leave comments in the Author Online forum and let me know if there's something that I can do to explain Spring Boot better for you.
Craig Walls
Appendixes:
This chapter covers:
How Spring Boot simplifies Spring application development
The essential features of Spring Boot
Setting up a Spring Boot workspace
The Spring Framework has been around for over a decade and has found a place as the de facto standard framework for developing Java applications. With such a long and storied history, some might think that Spring has settled, resting on its laurels, and is not doing anything new or exciting. Some might even say that Spring is legacy and that its time to look elsewhere for innovation.
Some would be wrong.
There are many exciting new things taking place in the Spring ecosystem, including work in the areas of cloud computing, big data, schema-less data persistence, reactive programming, and client-side application development.
Perhaps the most exciting, most head-turning, most game-changing new thing to come to Spring in the past year or so is Spring Boot. Spring Boot offers a new paradigm for developing Spring applications with minimal friction. With Spring Boot, youll be able to develop Spring applications with more agility and be able to focus on addressing your applications functionality needs with minimal (or possibly no) thought of configuring Spring itself. In fact, one of the main things that Spring Boot does is to get Spring out of your way so you can get stuff done.
Throughout the chapters in this book, well explore various facets of Spring Boot development. But first, lets take a high-level look at what Spring Boot has to offer.
Spring started as a lightweight alternative to Java Enterprise Edition (JEE, or J2EE as it was known at the time). Rather than develop components as heavyweight Enterprise JavaBeans (EJBs), Spring offered a simpler approach to enterprise Java development, utilizing dependency injection and aspect-oriented programming to achieve the capabilities of EJB with plain old Java objects (POJOs).
But while Spring was lightweight in terms of component code, it was heavyweight in terms of configuration. Initially, Spring was configured with XML (and lots of it). Spring 2.5 introduced annotation-based component-scanning, which eliminated a great deal of explicit XML configuration for an applications own components. And Spring 3.0 introduced a Java-based configuration as a type-safe and refactorable option to XML.
Even so, there was no escape from configuration. Enabling certain Spring features such as transaction management and Spring MVC required explicit configuration, either in XML or Java. Enabling third-party library features such as Thymeleaf-based web views required explicit configuration. Configuring servlets and filters (such as Springs DispatcherServlet) required explicit configuration in web.xml or in a servlet initializer. Component-scanning reduced configuration and Java configuration made it less awkward, but Spring still required a lot of configuration.
All of that configuration represents development friction. Any time spent writing configuration is time spent not writing application logic. The mental shift required to think about configuring a Spring feature distracts from solving the business problem. Like any framework, Spring does a lot for you, but it demands that you do a lot for it in return.
Moreover, project dependency management is a thankless task. Deciding what libraries need to be part of the project build is tricky enough. But its even more challenging to know which versions of those libraries will play well with others.
As important as it is, dependency management is another form of friction. When youre adding dependencies to your build, youre not writing application code. Any incompatibilities that come from selecting the wrong versions of those dependencies can be a real productivity killer.
Spring Boot has changed all of that.
Suppose youre given the task of developing a very simple Hello World web application with Spring. What would you need to do? I can think of a handful of things youd need at a bare minimum:
A project structure, complete with a Maven or Gradle build file including required dependencies. At the very least, youll need Spring MVC and the Servlet API expressed as dependencies.
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