Lol, that Guava issue is hilarious. It took them 3 years xD. I’ll check out Green Robot’s EventBus and JDeffered, they look promising.
Hey, I’d love to contribute 
Maybe I can help out with the loading of the different 3D model file formats. You’ll need to wait though; I’ve got exams until the 6th of October. After that I’ll be completely free!
Eh, Im about to abandon this. Porting Assimp and making uploaders for all the graphics libraries seems like a much better option!
If you’d like to help elect in porting Assimp, we’d love some extra man power. Just read up on the docs, and go from there. PM me or elect if you want to make a pull request into the main repository: https://github.com/java-graphics/assimp