ClassCastException when purging authorizables

[inedoviesov1]

We have a group "GroupA" (created by ACTool) and we have a CUG configured on some page to allow access for this group.
Now we do not need this group anymore and would like to delete it.
When running ACTool we get an exception:
Exception while purgin authorizables: java.lang.ClassCastException: org.apache.jackrabbit.oak.spi.security.authorization.cug.impl.CugPolicyImpl cannot be cast to javax.jcr.security.AccessControlList
Source

accesscontroltool/accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImpl.java

Line 840 in faa8a90

LOG.error("Exception while purgin authorizables: " + e, e);

While this error is valid and should prevent the deletion of the group, would be nice to have more information in the logs, what group could not be deleted, and what is the path in the repository.

[kwin]

PR highly appreciated!

[inedoviesov1]

In few weeks after vacation.