单独建一个web工程，写一个jfreechart的jsp，可以正常运行，并在网页上显示相应图片
当将同样的配置及代码放到另一个工程（个人的毕业设计）时，开始没有错误，一运行到该jsp就出错，报错如下
276 ERROR com.opensymphony.xwork2.interceptor.ParametersInterceptor:38 - Developer Notification (set struts.devMode to false to disable this message):
Unexpected Exception caught setting 'filename' on 'class com.opensymphony.xwork2.ActionSupport: Error setting expression 'filename' with value ['jfreechart-666454999448796797.png', ]
Error setting expression 'filename' with value ['jfreechart-666454999448796797.png', ] - [unknown location]


Caused by: No object in the CompoundRoot has a publicly accessible property named 'filename' (no setter could be found). - [unknown location]


请各位大神指导一下怎么解决这个问题啊？万分感谢！！！

e^^^^^看不懂……………………