The Karaf jetty feature references:
This bundle is not on the central maven repo (it's on the java.net maven2).
So, it can't be downloaded during features validation for instance.
Around the same area, the Karaf Cellar feature uses jclouds features now. The jclouds features uses google Guava OSGi bundle, but this bundle is only available on OSS Sonatype repo, not the central one.
We should also deploy Google Guava OSGi on the Maven central repo.