[aidenn0]

This probably doesn't count as "natively" but I've run ABCL[1] under Doppio[2]. Startup times are under a minute in Chromium based browsers and under an hour in Firefox. I've run into zero stability issues, but its no speed demon.

[edit]

Just tried again today and Firefox gets to a REPL in about 3.5 minutes, while chromium is still right about 1 minute.

1: https://abcl.org/

2: https://plasma-umass.org/doppio-demo/

[metagame]

Thank you for making it!

Unfortunately, a JVM on wasm would be quite difficult for the same reason that Lisp over wasm is quite difficult (I had actually looked for wasm JVMs before trying anything). I had no idea there was a JS JVM implementation! That's very cool.

[kaba0]

There is also TeaVM which is very fast and has both a js and a wasm target.

[aidenn0]

TeaVM lacks reflection and a class loader, both of which are necessary for ABCL.