org/apache/commons/lang/UnhandledException

Struts has detected an unhandled exception:

Messages:

org.apache.commons.lang.UnhandledException
org/apache/commons/lang/UnhandledException
java.lang.NoClassDefFoundError: org/apache/commons/lang/UnhandledException
File: org/apache/jasper/servlet/JspServlet.java

jar包都放进去了，为什么会这样

http://download.csdn.net/detail/itopme/3857651