hi Nam,
In Struts, struts.xml file should reside on the classpath of the webapp (generally /WEB-INF/classes).
If you are using eclipse and putting struts.xml file in the src folder then at deployement it will
go into the web-inf/classes folder.
It is advisable to put the xml file in the web-inf/classes and its standard.Apart from
that if the file is in the classpath struts will find the config file.
this will give you some idea :
Configuration file