RocksDB can be built as a single self contained cross-platform JAR. The cross-platform jar can be usd on any 64-bit OSX system, 32-bit Linux system, or 64-bit Linux system.
Once you have these items, run this make command from RocksDB's root source directory:
make jclean clean rocksdbjavastaticrelease
This command will build RocksDB natively on OSX, and will then spin up two Vagrant Virtualbox Ubuntu images to build RocksDB for both 32-bit and 64-bit Linux.
You can find all native binaries and JARs in the java directory upon completion: