There is TeaVM for whatever it’s worth. JavaScript and WASM really seem more portable. They have now approximated what Java web applets tried to achieve. And

There is TeaVM for whatever it’s worth. JavaScript and WASM really seem more portable. They have now approximated what Java web applets tried to achieve. And now WASM can be run in Mainframe IBM JVMs. Nashorn or Rhino seems like it runs JavaScript there. JavaScript and WASM are now getting close to COBOL's importance. That’s no mean feat.