*
     * @param groupPager the pager containing pagination and search criteria
     * @return a list of groups matching the criteria
     */
    public List<Group> getGroupList(final GroupPager groupPager) {

        final PagingResultBean<Group> groupList = groupBhv.selectPage(cb -> {
            cb.paging(groupPager.getPageSize(), groupPager.getCurrentPageNumber());

     * @param data the render data
     * @param form the search form
     */
    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "groupItems", groupService.getGroupList(groupPager)); // page navi

        // restore from pager
        copyBeanToBean(groupPager, form, op -> op.include("id"));
    }