You can install Groovy by using the same repository quantal uses; however, I caution you with this. I did it, but it works only after doing some things first.
To begin, you must install qt4, NOT qt5. It will not work with qt5 (at least, for my purposes it hasn't). Also note that there might be some unexpected issues in the future with this... But, try it. It's working fine for me.
One more thing: you will need to link python correctly. Run this command:
sudo ln -sf /usr/lib/x86_64-linux-gnu/libpython2.7.so.1 /usr/lib/libpython2.7.so
This will fix the python linking. Good luck!