has anyone heard of a java implementation of the rsync protocol other than the inactive "JarSync" Project on SourceForge? Or is there anything that compares to rsync that has been implemented in java?
One of the two original developers of rsync wrote an implementation recently in pure Java so it can be platform independent. It is called yajsync.
EDIT: Actually it wasn't the original developer who developed it just that the Github page has his name at the bottom of the page next to the license statement. It was written by Per Lundqvist. It is active though and better than Jarsync which is inactive.