My point was that I've never had to care if a jar contained C libraries or not. Some do, many don't, but I've never had to care. Maybe I've just been lucky. I

My point was that I've never had to care if a jar contained C libraries or not. Some do, many don't, but I've never had to care. Maybe I've just been lucky. I suppose it could have been a fat-jar thing: if the jar contains its non-java dependencies for my platform, then everything just works. If the native libs are separate, then sure, its a similar issue as described elsewhere here.