CDI (contexts and dependency injection) is a dependency injection (DI) specification bundled with Java EE 6 and higher. It implements an annotation-based DI framework, making it easier to fully automate dependency management and letting developers focus on coding, rather than dealing with DI in all its different slants. DI is one of the most ubiquitous forms of inversion of control used in object-oriented design. But this doesn’t imply that implementing the pattern manually is inherently easy, as it always requires explicitly implementing some kind of creational pattern, such as factories or builders as the underlying injectors.
