Java SE (Java Platform, Standard Edition)

I'm working on a browser-embedded JavaFX application and I'd like to OAuth to authenticate with some web service. The web service provides an Access Token and a Refresh Token.

The challenge I'm facing is that the application needs to securely store the Refresh Token someplace so that once the Access Token expires, you can generate a new one. (The Access Token doesn't need to be stored anywhere -- it's only used while the application is running, and thus stays in RAM and nowhere else.)

It seems like iOS and Android have some sort of keystore objects for developers to store this kind of information, but I'm not seeing the same thing for Windows and Mac.

Has anyone faced this situation before? Any suggestions on how to securely store the Refresh Token are appreciated.

~~ Michael