Please be sure to use code tags when posting code to the forums. Unformatted code is extremely hard to read and many people that might be able to help you will just move along to posts that are easier to read. Please read this for more information.
You can go back and change your post to add code tags by clicking the button on your post.
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.