How do you maintain java webapps in different staging environments?

You might have a set of properties that is used on the developer machine, which varies from developer to developer, another set for a staging environment, and yet another for the production environment.

In a Spring application you may also have beans that you want to load in a local environment but not in a production environment, and vice versa.

How do you handle this? Do you use separate files, ant/maven resource filtering or other approaches?