Is there any way to define a default method for every in the action mapping of Struts-Config.XML file? If yes then how? Give a piece of code demonstrating the same.

As far as my knowledge and experience is concern there is no way to have default method for all the Action Mappings. But what i can suggest you is try to define one interface with the default method declaration and implement in all the Action Forms in that way you can get a default method for all the ActionForm its just an idea.
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