Java client and rsync

Are there any available java classes that can use rsync for file transfer. If so do they support connecting to an rsync-server. Any reasons to or not to do this from within java would also be appreciated.   _Brian    

using uid instead of USER or LOGNAME

Are there any known patches to use a users effective uid rather than the environment variables USER or LOGNAME with an rsync server. Any suggestions would be appreciated.     _Brian Brian Holstein Sysadmin  SLK Hull derivatives