That sounds interesting - have you got any more details on exactly how they set this up?

You can also use the Java Unsafe class to squeeze performance (every last bit) by recycling objects. I'm sad to say that I've had to do that at least once to make some vector math work.

Edit: Check out https://dzone.com/articles/understanding-sunmiscunsafe

A person on a conference has not mentioned details. The reason for Java is productivity and access to a bigger pool of developers.