CDIomgevingen

CDIomgevingen, or Contexts and Dependency Injection (CDI) environments, are a set of services provided by the Java EE platform to manage the lifecycle of stateful components, known as beans, within an application. CDI is designed to simplify the development of enterprise applications by promoting a more modular and loosely coupled architecture. It achieves this through the use of dependency injection, which allows beans to be automatically injected into other beans, reducing the need for manual instantiation and configuration.

CDI environments support several types of beans, including managed beans, session beans, and producer methods. Managed beans are simple Java classes that are managed by the CDI container, while session beans are enterprise beans that can be used for transaction management and remote access. Producer methods allow for the creation of beans that are not directly managed by the CDI container, providing greater flexibility in bean creation.

One of the key features of CDI environments is the use of qualifiers and stereotypes. Qualifiers are annotations that can be used to distinguish between beans of the same type, allowing for more precise dependency injection. Stereotypes, on the other hand, are a way to group together multiple qualifiers and other metadata, simplifying the configuration of beans.

CDI environments also provide support for interceptors, which can be used to add cross-cutting concerns, such as logging or security, to beans without modifying their code. Interceptors are defined using annotations and can be applied to individual methods or entire classes.

In summary, CDIomgevingen are a powerful set of services provided by the Java EE platform to manage the lifecycle of stateful components within an application. Through the use of dependency injection, qualifiers, stereotypes, and interceptors, CDI environments promote a more modular and loosely coupled architecture, simplifying the development of enterprise applications.