I am building a Java web app that needs to do some complex input validation. I would prefer to be able to validate the input on the client side before sending it off, so that the user gets quicker feedback. So that I don't have to write it twice (and have two implementations that could have bugs and need to produce the same results), I wanted to write it in a way that I can code it once and call it from both Java on the server and JavaScript on the client.
I considered developing it in Ceylon, but that language has not had a stable release in 3.5 years and officially only supports Java 7 and Java 8.
I also thought of using Nashorn and calling JavaScript from Java, but Nashorn has been deprecated for years and is not being included in the newest Java releases.
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