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highly type-safe

consistent

portable

CDI enhances the Java EE programming model in two more important ways

allows you to use EJBs directly as JSF backing beans

CDI allows you to manage the scope, state, life-cycle and context for objects in a much more declarative fashion, rather than the programmatic way

CDI has no component model of its own

set of services that are consumed by Java EE components such as managed beans, Servlets and EJBs.

well-defined create/destroy life-cycle that you can get callbacks for via the @PostConstruct and @PreDestroy annotations.

Managed beans

annotation

CDI also integrates with JSF via EL bean name resolution

CDI does not directly support business component services such as transactions, security, remoting, messaging

JSR 330 defines a minimalistic API for dependency injection solutions and is primarily geared towards non-Java EE environments.

Figure 1 shows how CDI fits with the major APIs in the Java EE platform.

none of this uses string names that can be mistyped and all the code is in Java and so is checked at compile time

are additional pieces of meta-data that narrow down a particular class when more than one candidate for injection exists