CDIenabled

CDIenabled refers to software components or applications that are managed within a CDI-enabled container, allowing them to participate in the Contexts and Dependency Injection (CDI) programming model. CDI is a standard in Java for dependency injection, contextual lifecycle management, and event handling, designed to decouple components and simplify wiring and lifecycle concerns.

In practice, a CDI-enabled deployment is recognized by the presence of a CDI deployment descriptor, typically beans.xml, in the appropriate location (META-INF for libraries, WEB-INF for web applications). Many modern application servers provide built-in CDI support, so CDI features are available automatically when the descriptor is present or when the server exposes CDI runtime capabilities. Common CDI implementations include Weld and Apache OpenWebBeans.

Key features of CDI-enabled applications include dependency injection via @Inject, contextual lifecycles with scope annotations such as @RequestScoped, @SessionScoped, @ApplicationScoped, and @Dependent, and the use of qualifiers and alternatives to select specific beans. CDI also supports producers with @Produces to create objects not managed directly by the container, events via @Observes for event-driven interactions, and additional mechanisms such as interceptors, decorators, and stereotypes to compose behavior and configuration.

Usage typically involves annotating classes with CDI annotations and injecting dependencies where needed, for example injecting a bean into a service or event handling via observers. In Java SE environments, enabling CDI may require adding a CDI implementation as a dependency and providing beans.xml, while Jakarta EE environments include CDI as part of the platform.

See also: Contexts and Dependency Injection, CDI implementations, Jakarta EE.