private void fillIdlePool() {
    int count = _minIdleCount;

    try {
      while (_connectionPool.size() < _minIdleCount && count-- >= 0 && _lifecycle.isActive()) {
        Subject subject = null;
        ConnectionRequestInfo info = null;

        UserPoolItem userPoolItem;

        userPoolItem = createConnection(_mcf, subject, info, null);

        if (userPoolItem != null) userPoolItem.toIdle();
      }
    } catch (Exception e) {
      e.printStackTrace();

      log.log(Level.FINE, e.toString(), e);
    }
  }