This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
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You want to get the multiple values of the drop down if I gather rightly from your post. For that use request. getParameterValues() to get all the selected values. The return type of the getParameterValues() is a String array.
One more small point that even I had overlooked. HTML and request parameters are case-sensitive. Your JSP reads Feedback whereas you are retrieving feedback. That is the reason why you are getting null value.
Other than that use the code mentioned above by Yousuf (with the case sensitive factor taken into consideration) and it should work.