Chapter 14. Pax CDI and OSGi Services

Figure 14.1, “Pax CDI Architecture” gives an overview of the technology stack underlying Pax CDI.

Pax CDI is the integration layer that makes it possible to deploy a CDI container within the Apache Karaf OSGi container.

JBoss Weld provides the CDI implementation for the Pax CDI integration. JBoss Weld is the reference implementation for CDI and comes with its own extensive documentation, CDI Reference Implementation.

A bean bundle is an OSGi bundle that has been enabled to use Pax CDI. A bundle cannot use CDI by default, it must be explicitly enabled to do so (see the section called “Requirements and capabilities”).

A CDI container effectively defines the scope for a collection of managed beans under CDI, which are capable of being published and injected within this scope. In the context of OSGi, a CDI container maps to a single bundle. That is, each bean bundle gets its own CDI container.

JBoss Fuse provides additional features that define CDI customizations (that is, non-standard CDI annotations) targeted at different aspects of middleware development. For example: