There seems to be a bit of confusion with ant on this thread - there is no reason for anyone to run ant as far as I can see.
There are two versions of the java ZeoSleepViewer, version 2a and 3a. ZEO seem to have removed their code from everywhere they had it for some reason, although I have both versions and there is no restriction to their distribution in either source or binary form.
3a has a couple of errors to it (which I fixed in my copy), 2a I believe works ok as it is.
As to how to start it, it depends entirely on your machine. On my copy (3a) on my macs (versions 10.6 and 10.8) I just double click the file (the jar file), and it runs. On a windows machine, it depends how it is set up as to how it works, on my windows machine it just works again with a double click, on some you may need a batch file (and on all windows machines you would have had to install java).
If people have a problem getting 3a working from a jar file I can probably put it somewhere.