Thymeleaf之SpelEvaluationException: EL1007E: Property or field '***' canno be found on null

modelAndView.addObject("loginUser", user);

loginUser里面有username属性

当我们想获取username时，需要加上if判断，即判断loginUser不为null
<th:block th:if="${loginUser!= null}">

　　<p th:text="${loginUser.username}"></p>

</th:block>