How to use the method getParameterValues() of request object in JSP?

I'm trying to use the method
String a[]=request.getParameterValues("ch_box");
to retrieve the values from the form
but it gives the error
"Method getParamaterValues(java.lang.String) not found in interface javax.servlet.http.HttpServletRequest."
so plz tell me how to overcome this hurdle?
thanx

Well, just one note... either you have a typo in your code, or else in your post.
If you cut and pasted the error message (which it looks like you did), then the method getParamaterValues() should be getParameterValues() instead (notice the spelling difference), so you probably just have a typo in your code.

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