* @param form the search form containing current search criteria
     */
    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "roleItems", roleService.getRoleList(rolePager)); // page navi

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

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

    private void registerForms(final RenderData data) {
        RenderDataUtil.register(data, "roleItems", roleService.getAvailableRoleList());
        RenderDataUtil.register(data, "groupItems", groupService.getAvailableGroupList());
    }