[jimbobthrowawy]

Where did you get a non-GPL version of OpenJDK?

[jevinskie]

Alternatively, where can I get the source for the app?

[Benjamin_Dobell]

Fair question if you've bought the app.

[echoangle]

You can download it for free and you can then compile stuff with it, so you don't need to buy anything for this

[jimbobthrowawy]

The appstore ToS explicitly forbids submitting apps containing code under the GPL or similar licenses, which was one of the main reasons I asked.