CDI Beans as JAX-RS components
40.1. Using CDI beans as JAX-RS components Both the JAX-RS and CDI specifications introduce their own component model. On the one hand, every class placed in a CDI archive that fulfills a set of basic constraints is implicitly a CDI bean. On the other hand, explicit decoration of your Java class with @Path or @Provider is required for it to become a JAX-RS component. Without the integration code, annotating a class suitable for being a CDI bean with JAX-RS annotations leads into a faulty result (JAX-RS component not managed by CDI) The resteasy-cdi module is a bridge that allows RESTEasy to work with class instances obtained from the CDI container. During a web service invocation, resteasy-cdi asks the CDI container for the managed instance of a JAX-RS component. Then, this instance is passed to RESTEasy. If a managed instance is not available for some reason (the class is placed in a jar which is not a bean deployment archive), RESTEasy falls back to instantiating the class itself. As a result, CDI services like injection, lifecycle management, events, decoration and interceptor bindings can be used in JAX-RS components.