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 worked. My extension class is just a dummy class now as I have to create and initialise everything outside it and then just set the initialisation values as you suggested.
Double the work until they fix this bug, but as long as it works.
Here's a description of what I'm doing for anyone who might want to try it: