Always throw an Exception
(never a Throwable
). You generally don’t catch Throwable
either, but you can. Throwable is the superclass to Exception
and Error
, so you would catch Throwable
if you wanted to not only catch Exception
s but Error
s, that’s the point in having it. The thing is, Error
s are generally things which a normal application wouldn’t and shouldn’t catch, so just use Exception
unless you have a specific reason to use Throwable
.