code: public void setIdleMin(int min)
    {
      if (min < 1)
        throw new IllegalArgumentException(L.l("idle-min must be greater than zero."));
  
      if (_idleMax <= min) {
        throw new IllegalArgumentException(L.l("idle-min '{0}' must be less than idle-max '{1}'.",
                                               min, _idleMax));
      }
  
      _idleMin = min;
  
      _launcher.setIdleMin(_idleMin);
    }
docs: Sets the minimum number of idle threads.