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.
That could be the simplest possible way of delivering your application. However you might be able to use embedded database or you can create a mega bundle installer which install and configure all components. For example izpack at http://izpack.org/ can be used to create installer for OpenJDK, Servlet container, DB?,... It has ANT integration which really ease java related installation/ configuration operation which have an ant task already in place.