/**
   * return group with given id (contains list of user ids for this group)
   *
   * @param groupId
   * @return Group
   */
  @Override
  public Group getGroup(String groupId) throws Exception {
    Group group = null;

    try {
      // Set the OrganizationSchema (if not already done)
      getOrganizationSchema();
      // Get the user information
      GroupRow gr = getOrganization().group.getGroup(idAsInt(groupId));
      if (gr == null) {
        throw new AdminException(
            "DomainDriverManager.getGroup",
            SilverpeasException.ERROR,
            "admin.EX_ERR_GROUP_NOT_FOUND",
            "group Id: '" + groupId + "'");
      }
      // Get a DomainDriver instance
      DomainDriver domainDriver = this.getDomainDriver(gr.domainId);
      // Get Group detail from specific domain
      group = domainDriver.getGroup(gr.specificId);

      // Fill silverpeas info of group details
      group.setId(groupId);
      group.setSpecificId(gr.specificId);
      group.setDomainId(idAsString(gr.domainId));
    } catch (AdminException e) {
      throw new AdminException(
          "DomainDriverManager.getGroup",
          SilverpeasException.ERROR,
          "admin.EX_ERR_GET_GROUP",
          "group Id: '" + groupId + "'",
          e);
    } finally {
      releaseOrganizationSchema();
    }
    return group;
  }