code: public void setGroupName (@Nonnull @Nonempty final String sGroupName)
    {
      ValueEnforcer.notEmpty (sGroupName, "GroupName");
      m_sGroupName = sGroupName;
    }
docs: Set the Quartz internal group name.
  
  @param sGroupName
  The new group name to be used. May neither be <code>null</code> nor
  empty.