Yes the GF LDAPRealm has a filter in the Realm which is defined as : "(&(objectclass=groupofuniquenames)(objectclass=*groupofurls*))";
This is for Dynamic Groups Support, and by default the GF LDAPRealm does a Static followed by a Dynamic group search.
But i guess the point is the exception is being logged as a WARNING, we should probably log it level FINE when the search filter is undefined ?.
So while everything works, you have these annoying Warnings being logged. Maybe you can file a p3 bug on GF.
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