There is no Action mapped for namespace [/] and action name [student ! welcome] associated with context path [/web_test_11]. [unknown location]

There is no Action mapped for namespace [/] and action name [student ! welcome] associated with context path [/web_test_11]. [unknown location]

出现该异常的原因有多种：这里写出我遇到的一种吧，自己找了半天才发现该错误

在进行动态方法调用的时候，一定要开启该功能，要不然就会报上面错误，即在struts.xml中配置常量struts.enable.DynamicMethodInvocation为true

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

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原文地址：https://www.cnblogs.com/SpringSmallGrass/p/3012830.html