backupgnucash jar file

[ETS]

On my way into linux from windows - I am trying to get
https://github.com/goodvibes2/BackupGnuCashWin/tree/master/src/backupgnucash
to work under Mint 18.  I've downloaded the jar file, and marked it as
executable, and tried to use the java 8 to run it ... but when I click
on the jar file nothing happens.  On the windows side, at least the
window popped up so you could set the paths.  Anyone else using this
program?