please anyone answer my question.
I am new to struts and i have this problem now 3 days.
I can't proceed without doing this.
I am reading ManningStruts2inAction book.
How do you expect anybody to help if you don't post your configuration? Don't append a WAR file--that's basically asking us to download, check the code for potential security issues, deploy, run, and debug.
Let's just jump right to the debug part. Post your config.
Use Struts 2.1, which has this enabled by default, or set the action extension constant.
I would *strongly* recommend spending some time with the Struts 2 documentation before proceeding much further; it will save you a *lot* of time and effort.