Java Reference
In-Depth Information
Chapter4.Learning Context and
Dependency Injection
We saw that Chapter 3 , Introducing Java EE 7 - EJBs , was challenging since we had to
cover lots of ground, including Java Enterprise enhancements and a Maven-specific config-
uration. In this chapter, we'll discuss Contexts and Dependency Injection ( CDI ), which
was added to the Java EE specification in Java EE 6 (starting from JSR 299). It provides
several benefits to Java EE developers that were missing, such as allowing any JavaBean to
be used as a JSF managed bean, including stateless and stateful session beans. You can find
more information on CDI and the newest version of the specification itself (JSR 346) at .
Some of the topics that will be covered in this chapter are as follows:
• What Contexts and Dependency Injection is and how it relates to EJB
• How to rewrite our ticket-booking example to use the CDI and JavaServer Faces
• How to run the project using Maven
This chapter assumes familiarity with JavaServer Faces ( JSF ), which will be used to
provide a graphical interface for our applications. If you are looking for a start up guide for
JSF, there are several excellent resources available online, including the relevant sections in
the official Java EE 7 tutorial at
op.htm#BNATX .
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