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https://issues.apache.org/jira/browse/KARAF-3469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14322735#comment-14322735
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Guillaume Nodet commented on KARAF-3469:
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What's the use case for that ? I'd like to avoid making this small framework a
fully featured OSGi dependency injection mechanism such as DS.
For an optional dependency, the best way may be to inject a BundleContext and
retrieve the service manually when the command is executed.
> It should be possible to create a reference to an optional service from a
> command
> ---------------------------------------------------------------------------------
>
> Key: KARAF-3469
> URL: https://issues.apache.org/jira/browse/KARAF-3469
> Project: Karaf
> Issue Type: Improvement
> Reporter: Christian Schneider
> Fix For: 4.0.0
>
>
> To inject services into commands you use the
> @org.apache.karaf.shell.api.action.lifecycle.Reference annotation. Unlike the
> one from DS this annotation does not have an optional flag.
> We should allow to reference optional services and have them injected with
> null if they are not present.
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