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The architecture page is great http://jumpstarter.io/technical but all these providers are for a 'Shared nothing' setup.

What would hosting like this - heroku style - look like for JVM-backed apps? E.g. written in Closure, Scala or plain old Java, where you want to persist stuff between requests?

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I'm an early beta user. Your web app is run in a virtual machine. You can store stuff to disk, in memory or in your own database (the PHP container gives you a database per default). I am not sure what happens to stuff in RAM if they choose to migrate you to a new host machine, though.

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