Expecting a string, date or number here, Expression x is instead a freemarker.ext.beans.BooleanModel
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此异常的原因是freemarker不支持boolean类型。解决办法有三个：
1、页面将属性转换为字符串：${entity.property?string("true", "false")}，例如${user.active?string("true", "false")}，后续判断时要注意是判断=="true"
2、将对象的属性的类型改成其它类型，比如数字0、1，字符串等
3、将对象的属性的类型改成freemarker.ext.beans.BooleanModel，这个类型怎么用还没搞明白。
最简单最方便的就是第1种了。
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