code: private ILockableEntityGroup ifindLockableGroup(String key, String lockOwner)
              throws GroupsException {
          return compositeGroupService.findGroupWithLock(key, lockOwner);
      }
docs: Returns a pre-existing <code>ILockableEntityGroup</code> or null if the group is not found.
  
  @param key String - the group key.
  @param lockOwner String - typically the user.
  @return org.apereo.portal.groups.ILockableEntityGroup