Hi,
I'm kinda new to jme and I was wondering if it's possible to use a .obj file in jme. 
If so, how?
Thanks in advance…
You sure can! If you have the tests handy, check out TestModelLoading (or named similar) as i beleive it handles several different formats, and also look here:
ObjToJme class
Oh ok. Thanks for your help!
There is a method in user code which loads models of all types and then exports a .jbin for later use. Take a look at that, it's really easy to use.