private void registerGroupFromEP(CounterUsageCollectorEP ep) {
    if (ep.implementationClass == null) {
      final String id = ep.getGroupId();
      if (StringUtil.isNotEmpty(id)) {
        register(new EventLogGroup(id, ep.version));
      }
    }
  }
private void registerGroupFromEP(CounterUsageCollectorEP ep)