- 第一个出现的错误是找不到struts.xml这个错误，具体报错的忘记复制下来了，这是一个很蠢的错误，后来找到原因我都要打自己了，浪费时间。一开始我以为是struts的包没有导进去，然后就检查，又重新导，结果没用，然后就开始检查struts.xml文件，看看有没有配置错误，找了好久也没发现错误，重写了好几次，然后又百度什么的。都没发现原因。最后我仔细看了看，我每次写这个代码的时候都会新建一个包，然后把action代码放进里面，但是这次忘记了，直接就新建了Class，直接下代码了，当然没在com包里面了，但是我在struts.xml文件里写的class=”com.UserAction”当然是错误的了，很难受！！
- 第二个是
The following has evaluated to null or missing:
==> parameters.id [in template “template/simple/radiomap.ftl” at line 67, column 8]
Tip: It’s the step after the last dot that caused this error, not those before it.
Tip: If the failing expression is known to be legally refer to something that’s null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing
- Reached through: #include “/${parameters.templateDir}… [in template “template/xhtml/radiomap.ftl” at line 24, column 1]
Java stack trace (for programmers):
freemarker.core.InvalidReferenceException: [… Exception message was already printed; see it above …]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:116)
at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:346)
at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
at freemarker.core.BuiltInForString._eval(BuiltInForString.java:26)
at freemarker.core.Expression.eval(Expression.java:78)
at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
at freemarker.core.DollarVariable.accept(DollarVariable.java:40)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:333)
at freemarker.core.Environment.visitAndTransform(Environment.java:413)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:108)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment.include(Environment.java:2074)
at freemarker.core.Include.accept(Include.java:165)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.MixedContent.accept(MixedContent.java:62)
at freemarker.core.Environment.visit(Environment.java:312)
at freemarker.core.Environment.process(Environment.java:290)
at freemarker.template.Template.process(Template.java:312)
这么大长的一串，其实就是struts2标签用错了，看错误提示，其实是radio的标签没有写name，加上name就好了！
总结：这两个错误贼蠢，是自己不小心弄的，浪费了好多时间，以后要注意！！！