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https://issues.apache.org/jira/browse/SLING-1007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721113#action_12721113
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Carsten Ziegeler commented on SLING-1007:
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I'll start with the original issue and when we've finished that we can have a
look at the other use case.
> Implement helper classloader
> ----------------------------
>
> Key: SLING-1007
> URL: https://issues.apache.org/jira/browse/SLING-1007
> Project: Sling
> Issue Type: New Feature
> Components: Commons OSGi
> Affects Versions: Commons OSGi 2.0.4
> Reporter: Felix Meschberger
> Assignee: Carsten Ziegeler
>
> Currently we require the ScriptEngine[Factory] implementation bundles to
> create bundle header
> DynamicImport-Package: *
> to be able to access anything from the scripts since scripts are executed in
> the class loader of the script engine bundle.
> The downside of running the scripts in the class loader of the script engine
> bundle and using this global dynamic import are:
> * scripts see internal classes of the script engine bundle
> * scripts engine bundles must provide for classes for the scripts
> * whenever a wire has been created for a script and the providing bundle is
> updated or uninstalled, the script engine bundle is also cycled.
> A better approach might be to provide a ClassLoader implementation which
> behind the scenes manages access to packages exported by the bundles
> installed in the system. I would imagine such an implementation along the
> following lines:
> * Uses PackageAdmin to find a bundle providing the required class
> * Copes with bundles being updated or uninstalled
> Maybe coping with bundles being updated or uninstalled requires a two level
> approach: a fronend class loader which answers the class and resource
> accesses by relaying to a backend class loader. The back end classloader does
> the hardwork of loading classes and resources by querying bundles. Whenever a
> bundle is updated or uninstalled the backend classloader gets replaced. A
> similar approach has been chosen for the Repository ClassLoader in the
> jcr/classloader bundle.
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