Oh, I know, I'm just pointing out that a self-hosted compiler is a different ballgame than a runtime being written in the language that runs on it. Without som

Oh, I know, I'm just pointing out that a self-hosted compiler is a different ballgame than a runtime being written in the language that runs on it. Without some degree of AOT compilation (usually of a subset or dialect of the language compiled in a different fashion), it's not really possible. The GP seemed to miss that the discussion was about the JVM, not javac. With Graal, it's possible to write a JVM in Java, but the JVM doesn't depend on another JVM to run, and the way it runs bytecode isn't the way it was compiled in the first place. It's not really self-hosted in the same way that a compiler can be.