docs: @Override
      public void updateMembers(IEntityGroup eg) throws GroupsException {
          Connection conn = null;
          EntityGroupImpl egi = (EntityGroupImpl) eg;
          if (egi.isDirty())
              try {
                  conn = RDBMServices.getConnection();
                  setAutoCommit(conn, false);
  
                  try {
                      primUpdateMembers(egi, conn);
                      commit(conn);
                  } catch (SQLException sqle) {
                      rollback(conn);
                      throw new GroupsException("Problem updating memberships for " + egi, sqle);
                  }
              } catch (SQLException sqlex) {
                  throw new GroupsException(sqlex);
              } finally {
                  if (conn != null) {
                      try {
                          setAutoCommit(conn, true);
                      } catch (SQLException sqle) {
                          throw new GroupsException(sqle);
                      } finally {
                          RDBMServices.releaseConnection(conn);
                      }
                  }
              }
      }