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Pretty sure that Java 9 should still fully support apps written for older versions of Java.

However, apps written specifically for Java 9 (e.g. using the new modules system) wouldn't work on older versions of Java.

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It's a little more complicated than that; for example, a good many clojure libraries were broken by Java 9. I haven't been writing clojure day to day for about six months, so I don't know how things are looking just now. But it would be a non trivial task to migrate a lot of clojure apps over.

I don’t think that many libraries were broken by Java 9. There was a bit of tooling, and ClojureScript required adding a module, but I haven’t come across any major broken libs yet. Let me know if you have examples I can add to my Clojure Java 9 upgrade guide: https://www.deps.co/blog/how-to-upgrade-clojure-projects-to-...

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