Many fixes on STC are only for 2.5+, they are not merged into
2.4.x(It's quite hard to merge). So if you have any issue on STC, please try
In addition, we have been trying to refine STC, the next fixes are
only for 2.5+ too, so we strongly recommend you upgrade groovy to 2.5.x,
which requires Java7+ and is more powerful and efficient than 2.4.x.