Libfroth (froth32/64.dll on Windows, libfroth.so on Linux) is an library which is essential for Steam connection for Spiral Knights. Currently there's only a 32-bit libfroth.so librarly on Linux platform so it's not possible to use 64-bit Java with it.
What I'm asking is that you, Grey Havens build also a 64-bit librfroth library for Linux, so I'd be possible for some of us who're anyway stuck with Steam accounts to also play on 64-bit Java.