docs: @Override
      public ILockableEntityGroup findGroupWithLock(String key, String lockOwner)
              throws GroupsException {
          CompositeEntityIdentifier ent = newCompositeEntityIdentifier(key);
          IIndividualGroupService service = getComponentService(ent);
          return (service == null) ? null : service.findGroupWithLock(ent.getLocalKey(), lockOwner);
      }