In jsp how to extract the value from a name obtained from javascript?

It's few time i program in Java and i'm involved in an application that uses javascript to communicate between pages. I've the follow problem: in my jsp page i must process a string, but this string is produced from a javascript function. But in jsp, out of javascript function, how can i access to the value of that string of which i see from Javascript only its name?

My string is already in a form, but i have not the request because data transmission happens through javascript: i've tried to write
request.getParameter("StringName")
and i've not found compilation mistakes but in execution the application gives error (maybe it doesn't find the request in the caller page)

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