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Bacis doubt input property in struts-config.xml

 
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I am very confused on the input property in the action mapping of struts-config.xml.
Whether the input property in the action mapping is mandatory and what it's use?.

I am trying do the following:











I am getting the following error:

 
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IntelliJ IDE Ruby
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The exception shown has nothing to do with the "input" attribute. The "input" attribute defines the page that has the form on it--if validation fails this would be the page you'd want to return to. I don't recall if it's mandatory or not, but it's handy.

You don't describe the circumstances under which you get the exception, so it's hard to help.
 
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