@Override
        public String toString() {
            return "DNCacheEntry{" +
                "userRDN=" + Arrays.toString(userRDN) +
                ", baseDN=" + baseDN +
                '}';
        }
Returns the cached BaseDN value, or null if this is a negative lookup result.

@return baseDN value
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapManager.java