Thymeleaf 中Property or field ‘xxx‘ cannot be found on null的一个解决办法

目前我的错误是作用域超出，使用xxx.属性时，应该在此循环内

这是错误的

<div class="mg-list-wrap" th:each="by:${ws}">



															<div class="mg-list-thumb" th:each="by:${ws}">
																<img src="/assets/img/adwords.png" class="mx-auto" alt="" />
															</div>
															<div class="mg-list-caption">
																<h4 class="mg-title" th:text="${by.wname}">岗位名称</h4>
																<span class="mg-subtitle" th:text="${by.num}">招聘人数</span>
																<span th:text="${by.dates}">发布日期</span>
															</div>




														</div>

 

修改后的为(each放在上一个div,by.wname在each包裹的范围内)

	<div class="mg-list-wrap" th:each="by:${ws}">



															<div class="mg-list-thumb">
																<img src="/assets/img/adwords.png" class="mx-auto" alt="" />
															</div>
															<div class="mg-list-caption">
																<h4 class="mg-title" th:text="${by.wname}">岗位名称</h4>
																<span class="mg-subtitle" th:text="${by.num}">招聘人数</span>
																<span th:text="${by.dates}">发布日期</span>
															</div>




														</div>