I think the class loading messages above were generated

by Tomcat. That's probably how it resolves the classes, so

I don't think that's an issue.

Could you raise the debug level in the CA subsystem too?

https://github.com/dogtagpki/pki/wiki/Configuring-Subsystem-Debug-Log

The authenticator uses the LDAP connection in the CA to

find the user in DS, so there might be an issue there.