Cross-posting as advised from DeveloperWorks: https://developer.ibm.com/answers/questions/212469/can-an-application-hosted-outside-bluemix-access-s.html
I am exploring a scenario wherein I have an existing Java application hosted on-premises outside BlueMix. I want to make it horizontally scalable. As part of this change I would like to know if I can provision a BlueMix Session Cache service to store the application's session state externally. The application will continue to be hosted outside BlueMix but use BlueMix Session Cache for session state management.