Invalid action class configuration that references an unknown class named

Struts has detected an unhandled exception:

Messages:	yhwAction Invalid action class configuration that references an unknown class named [yhwAction]
File:	org/apache/catalina/loader/WebappClassLoader.java
Line number:	1,387

---

Stacktraces

java.lang.RuntimeException: Invalid action class configuration that references an unknown class named [yhwAction]

可能存在的問題是 struts.xml對應的這個action 沒有配好 例如 action裏的return的內容在 result裏找不到 或者是表單提交的action沒配置