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.
Always we need to read any input using the right encoding. This requires that you instruct the ServletRequest object what encoding to use before you read any data from it. Once you read data from the Request, the encoding is set forever.
Try using request.setCharacterEncoding("UTF-8")