Correct, implementing the core libraries is actually a massive effort. You can't just take the Hotspot one because it is a massive cumbersome codebase and it wo

Correct, implementing the core libraries is actually a massive effort. You can't just take the Hotspot one because it is a massive cumbersome codebase and it would force your JVM to work like Hotspot internally. (Let's ignore for a moment the question whether that would even be legal)