<c:when test="${ !user.groups.isEmpty() }">报错了，怎么解决 <c:when test="${ !user.groups.isEmpty() }">报错了
阅读背景：
The function isEmpty must be used with a prefix when a default namespace is not
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<c:when test="${ !user.groups.isEmpty() }">报错了，怎么解决 <c:when test="${ !user.groups.isEmpty() }">报错了
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