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I don't know if there are any commercial special purpouse ARM JVMs, but HotSpot/OpenJDK is pretty sad performance-wise on ARM.

Oracle provide Java 8 for ARM: http://www.oracle.com/technetwork/java/javase/downloads/jdk8... The performance on my little Raspberry Pi went up dramatically compared to OpenJDK when they released it (over a year ago).

There's a marked absence of benchmark data on the web about this vs same on x86. Does Oracle's license forbid publication of such?

Yeah - was once instructed to use a full container (Glassfish) on ARM. A bootup took 5 minutes, requests took ten seconds. It was depressing.