A decent java bittorrent library

Question

I need a bittorrent library for java that works properly

I tried Snark,but it's more of a bittorrent program than a library

Tried to use the jar,but couldn't know what to do with it in netbeans

I also tried Java Bittorrent API,but it's no longer being maintained,and it's still in beta

Are there any libs out there other than those?

The library should be :

1-well documented(javadocs and complete working examples)

2-stable

3-easy to use