I18n/l10n

I would like to know what do you think is the best way to write
localized messages in web application. I have a few possibilities:

1. Servlet Filter (outputstream search/replaces)
2. Resource Bundles
3. Database lookups
4. Ant task that does the replaces and deploys each
   language in it's own dir and then use Maverick's
   shunting.
5. Add yours.


I'm thinking about option 4 as the best alternative. What do you think?



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