Spring mvc HTTP状态500-预期的会话属性'；同意'；

这是我同意的html格式。发布输入后，我在浏览器上发现错误

<form th:object="${consent}" action="../users/userDetails.html" th:action="@{${#httpServletRequest.servletPath}}" method="post">
  <fieldset>
    <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">Service  Provider</label>
        <select id="provider" name="provider" class="form-control" th:onchange="'javascript:showPIIDoc(this.value);'">
            <option th:value="0" >Select a Service Provider</option>
            <option th:each="provider : ${user.providers}"  name="name"  th:value="${user.id} +','+ ${provider.id}" th:text="${provider.name}" >[name]</option>
        </select>

    </div>  
    <div style="clear:both"></div>
    <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">PII Document</label>
        <select id ="documentdiv"  class="form-control">

        </select>
    </div>  
    <div style="clear:both"></div>

        <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">Share with</label>
        <select  class="form-control">
            <option th:value="0" >Select a user you want share the document to</option>
            <option  name="name" th:each="user : ${users}"  th:value="${user.id}" th:text="${user.firstName} + ' ' + ${user.lastName}">[name]</option>
        </select>
    </div>
    <div style="clear:both"></div>
    <div class="col-sm-7 col-md-6 col-lg-5">
        <label for="last_name">Consent</label>
        <div style="clear:both"></div>
        <input type="checkbox" name="share" th:value="1" th:text="Share" />
     </div> 

     <div style="clear:both"></div>

    <div style="margin-top:10px;margin-left:10px" class="form-actions">
        <button class="btn btn-primary" type="submit">Add Consent</button>

    </div>
  </fieldset>
</form>

我在浏览器上看到这个错误

<form th:object="${consent}" action="../users/userDetails.html" th:action="@{${#httpServletRequest.servletPath}}" method="post">
  <fieldset>
    <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">Service  Provider</label>
        <select id="provider" name="provider" class="form-control" th:onchange="'javascript:showPIIDoc(this.value);'">
            <option th:value="0" >Select a Service Provider</option>
            <option th:each="provider : ${user.providers}"  name="name"  th:value="${user.id} +','+ ${provider.id}" th:text="${provider.name}" >[name]</option>
        </select>

    </div>  
    <div style="clear:both"></div>
    <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">PII Document</label>
        <select id ="documentdiv"  class="form-control">

        </select>
    </div>  
    <div style="clear:both"></div>

        <div class="col-sm-7 col-md-6 col-lg-5">
    <label for="last_name">Share with</label>
        <select  class="form-control">
            <option th:value="0" >Select a user you want share the document to</option>
            <option  name="name" th:each="user : ${users}"  th:value="${user.id}" th:text="${user.firstName} + ' ' + ${user.lastName}">[name]</option>
        </select>
    </div>
    <div style="clear:both"></div>
    <div class="col-sm-7 col-md-6 col-lg-5">
        <label for="last_name">Consent</label>
        <div style="clear:both"></div>
        <input type="checkbox" name="share" th:value="1" th:text="Share" />
     </div> 

     <div style="clear:both"></div>

    <div style="margin-top:10px;margin-left:10px" class="form-actions">
        <button class="btn btn-primary" type="submit">Add Consent</button>

    </div>
  </fieldset>
</form>

HTTP状态500-预期的会话属性“同意”

提交表格后

这是GET方法的控制器代码。它过去叫同意书

    @RequestMapping(value = "/users/{userId}/providers/{providerId}/documents/{documentId}/consents/new", method = RequestMethod.GET)
    public String initNewConsentForm(@PathVariable("userId") int userId,@PathVariable("providerId") int providerId,@PathVariable("documentId") int documentId, Model model) {
        User user = this.clinicService.findUserById(userId);
        Provider provider = this.clinicService.findProviderById(providerId);
        Document document = this.clinicService.findDocumentById(documentId);
        Collection<User> users = this.clinicService.AllUsers();

        Consent consent = new Consent();
            model.addAttribute("provider",provider);
            model.addAttribute("document", document);
            model.addAttribute("user", user);
            model.addAttribute("users", users);
            return "providers/createOrUpdateConsentForm";

    }

@RequestMapping（value=“/users/{userId}/providers/{providerId}/documents/{documentId}/approves/new”，method=RequestMethod.GET）
公共字符串initnewapproverform（@PathVariable（“userId”）int-userId，@PathVariable（“providerId”）int-providerId，@PathVariable（“documentId”）int-documentId，Model-Model）{
User User=this.clinicService.finduserbyd（userId）；
提供者提供者=this.clinicService.findProviderById（providerId）；
Document Document=this.clinicService.findDocumentById（documentId）；
集合用户=this.clinicService.AllUsers（）；
同意=新的同意（）；
model.addAttribute（“提供者”，提供者）；
model.addAttribute（“文档”，文档）；
model.addAttribute（“用户”，用户）；
model.addAttribute（“用户”，用户）；
返回“providers/createOrUpdateConsentForm”；
}

添加

model.addAttribute（“同意”，同意）在GET方法中。
为什么在表单中有属性
action
和
th:action
？我正在使用thymeleaf。我们可以使用这两个属性。我做错了吗？我知道这是thymeleaf，请尝试删除
操作
属性。它不适用于相同的问题。你认为这个错误在哪里？在控制器中还是html中@NikolayRusev问题可能出在您提供此表单的方法中。您可以发布GET方法的代码吗。可能是您缺少
model.addAttribute（“同意”，新同意（））