We want to stop supporting jar-in-jar for plugins at some point. When loading plugins on server side, a warning should be emitted when the plugin MANIFEST contains Plugin-Dependencies entry.
Use of 'Plugin-Dependencies' mechanism is planned for removal. Update the plugin 'XXX' to shade its dependencies instead.
As an example, see what was done for
Maybe we should not emit the warning for bundled plugins, since the user has no control on them (and we know we still have some plugins using this feature).