After being bitten by APPLICATION_VERSION I switched to this
configuration.override(SymbolConstants.APPLICATION_VERSION,
*new*Date().getTime());
This way on my development machine I get a new version every restart and on
my production machine on every deploy.
That said I think the hash of the object in the URL and a never expires
header is the way to handle this. The only problem I can think of is assets
in style sheets. I would say the solution to that problem lookup the asset
with the hashed url and return the object with a never expires header. If
there is no hash just return the object without the header. This makes it
easy to use assets in stylesheets. If you want to solve the caching problem
just override (or declare) the style in the Layout component and use the
asset like this:
<style>
.navbar-fixed-top {
xheight: 64px;
background-position: 0px 40px;
xbackground-image: url('${context:/images/top-background.jpg}');
xbackground-repeat: repeat-x;
}
</style>
