java.lang.IllegalStateException:作为请求属性的bean名称的BindingResult或普通目标对象都不可用

Question

我试图从spring中从控制器获得的列表中填充一个复选框。Im从服务中获取列表，然后将其作为属性添加到模型中。但是，我发现很难访问它并将其显示为视图中的复选框。所以我在日志中得到了上面的错误，而我没有得到视图。有什么可能出了问题？

控制员：

    @RequestMapping(value = "/user-roles", method = RequestMethod.GET)
    public String viewRoles(Model model) {

    List<Permission> permissionsList;
    permissionsList = roleService.getAllPermission();

    model.addAttribute("permissions", permissionsList);
    return "user_roles";
}

    @RequestMapping(value = "/roles/addrole", method = RequestMethod.POST)
    public ModelAndView saveEmployee(@ModelAttribute("addrole") SystemRole role, ModelMap model) {

    roleService.saveSystemRole(role);
    model.addAttribute("user", new SystemRole());
    return new ModelAndView("user_roles");
}

意见：

           <div class="modal-body">
            <form:form method="post" modelAttribute="addrole" action="/roles/addrole">
                <div class="form-group">
                    <label for="role-name" class="col-form-label">Role Name</label>
                    <input type="text" class="form-control" id="role-name">
                </div>
                <div class="form-group">
                    <label class="col-form-label">Permissions</label>

                    <div class="check-box" style="padding-left: 20px">
                        <c:forEach items="${permissions}" var="oo">
                            <form:checkbox id="${oo.id}" label="${oo.name}" value="${oo.id}" path="permissionList"/>
                        </c:forEach>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Submit</button>
                </div>
            </form:form>
        </div>

这是注释复选框表单时的视图：

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Answer 1

如果要显示permission字段的复选框，请尝试更改

                    <div class="check-box" style="padding-left: 20px">
                        <c:forEach items="${permissions}" var="oo">
                            <form:checkbox id="${oo.id}" label="${oo.name}" value="${oo.id}" path="permissionList"/>
                        </c:forEach>
                    </div>

至

 <c:forEach items="${permissions}" var="oo">
  <div class="checkbox">
    <label for="${oo.id}">
      <input type="checkbox" name="checkboxes" id="${oo.id}" value="${oo.id}">
      ${oo.name}
    </label>
  </div>
</c:forEach>

或

<c:forEach items="${permissions}" var="oo">
    <div class="check-box" style="padding-left: 20px">
       <form:checkbox id="${oo.id}" label="${oo.name}" value="${oo.id}" path="permissionList"/>
    </div>
</c:forEach>