Apache Karaf SCR example

Abstract

SCR (Service Component Runtime) is a convenient way to use services with annotations.

As it‘s part of the OSGi compendium specification, you don’t need any large dependency to use it.

Artifacts

• karaf-ds-example-api provides the BookingService interface and Booking POJO.
• karaf-ds-example-provider implements and exposes a BookingService using Component annotations.
• karaf-ds-example-client uses a BookingService reference injected thanks to Reference annotations.
• karaf-ds-example-features contains a Karaf features repository used for the deployment.

## Build

Simply use Apache Maven:

mvn clean install

## Features and Deployment

On a running Karaf instance, you register the example features repository with:

karaf@root()> feature:repo-add mvn:org.apache.karaf.examples/karaf-scr-example-features/LATEST/xml

Then, you can install the karaf-scr-example-client feature:

karaf@root()> feature:install karaf-scr-example-client

This feature installs the karaf-scr-example-provider feature providing the service, and the client bundle.

Usage

When you install the client feature, you should see on the console:

karaf@root()>                                                                                                                                                                                     
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1 - AF520 - John Doe

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2 - AF59 - Alan Parker