在使用freemarker的过程中经常会见到如下错误:
11 十二月 2015 15:53:09,674 ERROR freemarker.runtime:98 - Error executing FreeMarker template FreeMarker template error: The following has evaluated to null or missing: ==> sex [in template "freemarker3.html" at line 10, column 3] Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??
模板代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>freemarker demo</title>
</head>
<body>
${username} <br />
${age}<br />
${sex}
</body>
</html>
?根本原因: sex没有设置值,所以报错
解决方法:
在未声明的变量后面增加叹号
${sex!}
?也可以设置默认值,在叹号后面增加默认值
${sex!‘abc‘}
?
参考附件
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原文：http://hw1287789687.iteye.com/blog/2263466