It's possible to use CDI in your applications, including sharing bean between bundles using the Karaf service registry.
In addition of supporting the regular CDI annotations (@ApplicationScoped, @Inject, etc), Karaf CDI also supports couple of new OSGi CDI annotations: @Service and @Reference.
In this example, we are using Aries CDI and OpenWebBeans as CDI container.
karaf-cdi-example-api provides API (interface) shared between provider and consumer bundles. It allows a decoupling between interface and bean implementation.karaf-cdi-example-provider provides an application scope bean and using the @Service annotation to register the bean in the Karaf service registry (can be used in another bundle).karaf-cdi-example-consumer creates another bean and inject the provider bean from the registry (thanks to the @Reference annotation).karaf-cdi-example-features provides a Karaf features XML to easily install the example application.##Build
Simply use:
mvn clean install
##Feature and Deployment
On a running Karaf instance, you register the CDI example features repository with:
karaf@root()> feature:repo-add mvn:org.apache.karaf.examples/karaf-cdi-example-features/LATEST/xml
Then you can install the karaf-cdi-example-provider feature:
karaf@root()> feature:install karaf-cdi-example-provider
Then, you can install the karaf-cdi-example-consumer feature:
karaf@root()> feature:install karaf-cdi-example-consumer
When you install the consumer feature, you will see:
Hello world