This is mostly a binding around Khaled Mamou’s V-HACD that provides a convenient way to decompose concave meshes into convex hulls, to be used for dynamic bodies in bullet.
The README.md contains all the info you’ll need to use it.
GitHub repo: https://github.com/riccardobl/jme3-bullet-vhacd/
More links: (just for knowledge sake)
Khaled Mamou’s blog: http://kmamou.blogspot.it/