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

使用struts2.3进行动态方法调用时出现：There is no Action mapped for namespace [/] and action name [user!add] associated with context path 

在xml中加入这一句：

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

就行了。