I would like to setup application configuration depending on what host the application is running on. I have 3 .properties files app-DEV.properties, app-TEST.properties and app.properties. I'm using tomcat and spring and I'm not sure if Spring has any built in control for this. How would I build in the swapping of config? Ideally, I would like to have a base file and that way the currently loaded properties file just overrides values to it.