I have somehow come upon this Java 5 Grammar for Sablecc. I can't remember where I found it, thus I can not remember the name of the author, and nothing is mentioned in the file. If you know of who is the author, please do not hesitate to contact me.
I have choosen to publish it here since I have found it more than difficult to find a working implementation of the Java 5 grammar for Sablecc, and by doing so I hope others will not get into as much trouble finding it as I did.
[Edit June 8th. 2008] I have now identified the author of the grammar, Stefan Mandel, and contacted him. The grammar is released under the LGPL, and I have added a copyright notice.