Freemarker报错Maybe using obj.something instead of obj.isSomething
背景
在使用Freemarker的过程中报错如下
freemarker.core.NonStringOrTemplateOutputException: For "${...}" content: Expected a string or something automatically convertible to string (number, date or boolean), or "template output" , but this has evaluated to a method+sequence (wrapper: f.e.b.SimpleMethodModel):
==> data.isResult [in template "order.ftl" at line 58, column 19]
----
Tip: Maybe using obj.something instead of obj.isSomething will yield the desired value.
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: ${data.isResult} [in template "order.ftl" at line 58, column 17]
----
原因及解决方法
java的get和setter方法默认规则如下,对于一个布尔变量val,声明为不同的类型,其getter和setter是不一样的
getter方法 | setter方法 | |
---|---|---|
boolean(基本数据类型) | isVal | setVal |
Boolean(包装类) | getVal | setVal |
这里我将boolean改成Boolean,重新生成setter和getter即可。
然而接下来出现了另一个问题,freemarker不支持boolean值的渲染,需要转成字符串,因此需要修改模版文件
这里将
${data.val}
改为
${data.val?string('true','false')}