Default implementation of the form input tag population strategy. First looks to see if there is a parameter with the same name as the tag submitted in the current request. If there is, it will be returned as a String[] in order to support multiple-value parameters.
If there is no value in the request then an ActionBean bound to the current form will be looked for. If the ActionBean is found and the value is non-null it will be returned. If no value can be found in either place, null will returned. @author Tim Fennell
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