It's not a fake, it's one of Norbert's emulators.
They used to be pretty popular until he removed 'em from his site:
February 26, 2004: Java Emulators Offline
Today I removed my Java emulators from my website. I think after four years and more than 5 million visits most of the people, who are interested in this stuff, now know about JAE, ONE, and NOSE. Thanks to all of you for visiting and for your nice emails. The project is not dead. I will continue my work on them and will let you know about the news here.
Anyway, I don't know if there are any other java nes emulators but I guess he's going to put his back someday.
Btw, here's a link to the mainpage of his site.
