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Using CDI and Dependency Injection for Java in a JSF 2.0 Application

Posted: December 9, 2009	Published: October 30, 2009
Author: Roger Kitain

JSR 299: Contexts and Dependency Injection (CDI) defines a set of services for the Java EE environment that makes applications much easier to develop. It provides an architecture that allows Java EE components such as servlets, enterprise beans, and JavaBeans to exist within the lifecycle of an application with well-defined scopes. In addition, CDI services allow Java EE components, including EJB session beans and JavaServer Faces (JSF) managed beans to be injected and to interact in a loosely coupled way by firing and observing events. Perhaps most significantly, CDI unifies and simplifies the EJB and JSF programming models. It allows enterprise beans to act as managed beans in a JSF application. Through its services, CDI brings transactional support to the web tier. This can make it a lot easier to access transactional resources in web applications. For example, CDI services makes it a lot easier to build a Java EE web application that accesses a database with persistence provided by the Java Persistence API.

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