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.
I see you found your "solution", but I can't quite figure out what you were trying to do. It looks like your form has a single String property named email but now your html page is going to have multiple hidden fields with the property name email.