Yep, I used Eclipse for this. When I first started making the mod I used MCreator, but not anymore.
Ah ok so your like me. The original version of my mod CookBook (which was never released) was Mcreator but i restarted when my computer broke and a lost all the files. So i decided to go clean and make my mod with Eclipse and from there it was great, more things i can do, and i know stuff for the future! intact I'm still learning! i don't even know ores yet .