Project Orion helped me get started in java, to make plugins easier. I think the greatest thing about it is that there is a new way explained on how to code plugins. The only downside to it is that it was very long (a lot of focus and preparation pre-learning videos ). Another bad thing would be that plugins created by you will be always very large, so if your plan is to create a small plugin (10-20kb) it could look bad because it will always be 300kb or more, but once you get over this aesthetic aspect, it is very good because you save lots of time when creating plugins