We are seeing this warning messages in our logs
javax.naming.PartialResultException: Unprocessed Continuation Reference(s); remaining name \'dc=global,dc=com\'
OK. You will be seeing this exception, when your search returns referral and you set to ignore the referral.
[Referral: When you search in AD, if AD thinks there are more information available in another place, it returns a referral [place to find more info] along with your search results.]
You could avoid this exception by setting Context.REFERRAL to follow. Then it would search in the referral also [That's why it takes more time to return result].
But in my case the referral is invalid and returned an another exception.
I fixed this issue by changing the baseDN (search base) to be more specific. E.g. ou=users,dc=mydomain,dc=com. Now I'm not seeing this exception, because it doesn't return any referral.