I'm curious to know more about these. Are any free? Are any open source? These aren't rhetorical questions, there's a ton of Java stuff I'd want to test it with.

I tried robovm, it actually worked nicely but apparently only does 32 bit. Also, the simple reference HelloWorld was nearly 10MB, the build process took 20 seconds, and running it took 15x longer than a comparable one in Go. I don't mean to knock it, what it does is amazing, but it's not a viable replacement for simple static command line tools.