Book Image

Spring Essentials

Book Image

Spring Essentials

Overview of this book

Spring is an open source Java application development framework to build and deploy systems and applications that run on the JVM. It is the industry standard and the most popular framework among Java developers with over two-thirds of developers using it. Spring Essentials makes learning Spring so much quicker and easier with the help of illustrations and practical examples. Starting from the core concepts of features such as inversion of Control Container and BeanFactory, we move on to a detailed look at aspect-oriented programming. We cover the breadth and depth of Spring MVC, the WebSocket technology, Spring Data, and Spring Security with various authentication and authorization mechanisms. Packed with real-world examples, you’ll get an insight into utilizing the power of Spring Expression Language in your applications for higher maintainability. You’ll also develop full-duplex real-time communication channels using WebSocket and integrate Spring with web technologies such as JSF, Struts 2, and Tapestry. At the tail end, you will build a modern SPA using EmberJS at the front end and a Spring MVC-based API at the back end.By the end of the book, you will be able to develop your own dull-fledged applications with Spring.
Table of Contents (14 chapters)
Spring Essentials
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Spring's Struts integration


Spring MVC relies on DispatcherServlet, which sends requests to controllers that are configurable mapping handlers with view and theme resolution. In Struts, the controller's name is Action. While Action instances will be instantiated for every request in Struts 2 to tackle the thread safety issue, Spring MVC creates controllers once, and each controller's instance serves all requests.

To enable Spring integration with Struts 2, Struts provides struts2-spring-plugin. In Struts 2.1, Struts introduced the convention plugin (struts2-convention-plugin), which simplified the creation of Action classes (by annotation) without any configuration file (struts.xml). The plugin expects a set of naming conventions for the Action class, package, and view naming that will be explained in this section.

To integrate Struts 2 with Spring, you need to add these dependencies:

<dependency>
  <groupId>org.apache.struts</groupId>
  <artifactId>struts2-core<...