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Error occurs when thymeleaf th: value is null

2022-04-23 04:32:00 【The hunter is eating meat】

Usually ,thymeleaf How values are displayed ：

<input type="text" class="form-control" th:value="${userDO.name}">

however , Be the object userDO It's empty , perhaps Object properties name It's empty time , Will report a mistake .

It can be optimized as follows ：

<input type="text" class="form-control" th:value="${userDO?.name}">

In case of multi-layer object nesting , It can be written as follows ：

<input type="text" class="form-control" th:value="${userDO?.name?.lastName}">

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