code: public static List<Object> lookupAttributeValues(LdapOperations ldapOperations, String dn, String attribute) {
          return lookupAttributeValues(ldapOperations, LdapUtils.newLdapName(dn), attribute);
      }
docs: Lookup all values for the specified attribute, looping through the results incrementally if necessary.
  
  @param ldapOperations The instance to use for performing the actual lookup.
  @param dn             The distinguished name of the object to find.
  @param attribute      name of the attribute to request.
  @return a list with all attribute values found for the requested attribute.
  Never <code>null</code>, an empty list indicates that the attribute was not set or empty.