In the commandbox REPL, is it possible to change the underlying engine that is executing the code to another engine, such as ACF? Or does it always use Lucee under the hood? (I'm assuming that's what it is doing...)

Not presently possible as it runs directly inside the CLI. It would be possible to connect it to a running server to change engines, but there's never really been demand for me to spend the time on it.

ah ok cool just exploring CB today 🙂

If Adobe had implemented JSR-223 as I had requested if them, it would be easier. 😁

erm I am not familiar with that... lol

Yes, it's how CommandBox runs Lucee

ah ok cool

For reference https://github.com/Ortus-Solutions/commandbox/blob/development/src/java/cliloader/LoaderCLIMain.java#L308

Neat!

Basically, any Java app can embed Lucee CFML code right inside their code using the scripting engine interface. It's how I pass control from the Java bootstrap to the CFML bootstrap