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.
It seems OK to me. Just make sure that you are using this validation rules file and that you set its location correctly in the validation plugin definition. I know that it's elementary, but I sometimes do much more stupid things