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The legacy use case is indeed very important, but there are many other opportunities that can come from using Java libraries as part of Web apps.

CheerpJ provide "Library mode": an API to natively interact with Java objects from JavaScript: https://cheerpj.com/docs/guides/library-mode

CheerpJ also support Java 17 (currently in preview) and LTS parity is scheduled for next year.

I use CheerpJ to do new development that is spectacularly cross-platform, runs native on all the major platforms and everywhere else in the browser with a single code base. I don't think there are too many alternatives for that and I suspect Java + CheerpJ is one of the best.

https://reportmill.com/SnapCode

This is really great! Thanks for sharing.

Being able to access the entirety of the JVM ecosystem of libraries from JS without glue code is kind of insane.

Yes, I'm super impressed by that.