There is no control over it in pure standard APIs, but if you are shipping a game you could do it with JVM specific ways or even ship a custom / customized GC.

There is no control over it in pure standard APIs, but if you are shipping a game you could do it with JVM specific ways or even ship a custom / customized GC. But most games don't actually need this. I'd be more concerned about whether there's a JVM language you like over other non JVM options for a game.