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  • Persisting oAuth credentials for an integration user in Spring (Heroku/cloudfoundry)


    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.