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How to check the variables i hv on JSP page from custom interceptor / action in struts2?

tommy tan
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is there any way that i can get the variables' name that display on JSP page from action/interceptor in struts2?

I was able to get a set of variable name using the code below:

However, it only print out those variable that has value in screen. For those variable that has no value, e.g. unchecked checkbox, is not printed out.

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