What makes you think there is a jar somewhere that contains a class with that name? I ask because when I put that name into an Internet search, the third link that came back was your question. This suggests that there isn't a widely used open-source class of that name. And
the first link was a Sun technical tip. But I assume you already did the Internet search and found nothing, although you didn't say that.
If that wasn't what you had in mind, then
you should go back to wherever you got the name from and follow up there.