Hello,

I have written a Spring MVC app that uploads files to my dropbox account.

I authenticate my Spring app with dropbox using oAuth once, at start up, using a specific Dropbox account which I'm using as an integration user.

I have written a FileUploadService that wraps all the authentication and upload logic. I use @autowire to use that service in my controllers/service layer.

I need to persist my oAuth credentials, so that I can restart my app without having to do that oAuth dance every time.

I'm looking for guidance on how to implement this in a clean way. I plan to deploy this app to heroku (and possibly move to cloudfoundry when that is GA) so local file storage is not an option AFAIK.

I can use postgresql to persist the credentials, but as they are static values, I'm not sure of the best approach to persist those JPA.

I think the crux of my question is how do I persist state of a singleton, but I don't want to scope the question so specifically, in case there are better approaches.

Thanks,
-Jev