动态方法调用 ：Could not find action or result

错误提示：

Messages: There is no Action mapped for namespace [/] and action name [user!add] associated with context path [/bjsxt_struts2_011]. 

调用URL：

http://localhost:8094/bjsxt_struts2_011/user!add

原因：
由于这是一个学习用的例子。而我的struts.xml又是直接拷贝的
http://struts.apache.org/上面的例子，
不小心把这句话给拷贝上了：

<constant name="struts.enable.DynamicMethodInvocation" value="false" />

struts.enable.DynamicMethodInvocation属性的含义是：

### Set this to false if you wish to disable implicit dynamic method invocation
### via the URL request. This includes URLs like foo!bar.action, as well as params
### like method:bar (but not action:foo).
### An alternative to implicit dynamic method invocation is to use wildcard
### mappings, such as <action name="*/*" method="{2}" class="actions.{1}">
struts.enable.DynamicMethodInvocation = true

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