Chapter 1, What is a Bean?, provides an overview of CDI beans and their history, before explaining how a Java class can be a bean.

Chapter 2, Dependency Injection and Lookup, explains injection and lookup functions, by understanding qualifiers and injection points. We also cover some possible Weld dependency errors and how our beans are proxied.

Chapter 3, Deploying JBoss Weld, covers how to deploy JBoss Weld to JBoss AS, GlassFish, and Tomcat.

Chapter 4, Scopes and Contexts, explains the scopes that are provided by CDI and how they should be used. We also explain pseudo scopes and creating a custom scope.

Chapter 5, Producers, covers producer methods and fields, injecting into producer methods, and how we can clean up beans that we produce.

Chapter 6, Interceptors and Decorators, explains how to create and enable an interceptor, and how their bindings are defined. We also look at enabling decorators and what is a decorator delegate.

Chapter 7, Events, explains how to listen for and fire events, and what type of payload can be sent. We also explain advanced event qualifiers and how to listen for events during specific transaction phases.

Chapter 8, Writing a Portable Extension, explains how to create an extension to CDI and what events the container fires that we can utilize. We then cover some examples of what can be achieved within an extension.

Chapter 9, Book Store – CDI Services, covers the development of CDI services, REST endpoints, and communicating with a database for our example application.

Chapter 10, Book Store – User Interfaces, explains how to develop a JSF admin interface and a user interface using AngularJS for our example application that will interact with our services.

To be able to run the examples from this book, you should have:

This book is for anyone wanting to understand what CDI 1.0 is and how it can be used to benefit an application's architecture. Experience with Java is required, but only so far as is needed to understand the coding constructs of the language. RESTful architecture, AngularJS, and Java Server Faces (JSF) skills are suggested, though not essential.

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "In the preceding examples we specified @RequestScoped."

A block of code is set as follows:

@RequestScoped
public class MySecondBean {
  MyFirstBean firstBean;
  @Inject
  public MySecondBean(MyFirstBean firstBean) {
    this.firstBean = firstBean;
  }
}

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "clicking the Next button moves you to the next screen".

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