Steps to reproduce

1.  Extends Pac4jConfigProvider by a very simple one like this ExtraPac4jConfigProvider.java in a custom Java module such as extended-sites.xml
2.  Start up a fresh version of Magnolia with the module in the bundle

.. Logs, screenshots, gifs...

Expected results

• System works by design

.. Justify non-trivial expectations with a link to a doc or a relevant discussion.

Actual results

• Error happen during start up process sso_startup_error_full.log

Workaround

• Let it finish the start up task, then stop and start again the instance

Development notes

• Pac4jConfigProvider constructor start its configuration monitoring on "resources" workspace before the workspace being created. Moving these initiation stuffs to the point after the workspace created would help. This should be in the SSO module's start up function info.magnolia.sso.SsoModule.start(ModuleLifecycleContext)