This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Again, if you can not hand the JavaDB since it has no GUI interface, I will advice you also download the free version of DbVisualizer
which gives you the facility to Query your DB via a GUI interface or NetBeans which is also an IDE
has the same GUI feature.