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How to find value of 'input' in an action class?

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I want to use one action class to serve multiple jsp forms. I am sure this is a common need. For e.g. typically Registration form and Profile maintenance form take same data validation, manipulation only few things like error messages may change.

In my action class how can I find value of 'input' as defined in struts-config.xml file? Value of 'input' will tell me from which jsp form did the request came from and then based on that I can change error messages.

Of-course, I can set session variable in my jsps and check that in my action class but I am looking for solution where some api will tell me the value of 'input'.
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