Is this just for those who are stuck with Nashorn, or will there be new development?
GraalJS is ECMASCript 2020 compatible and is said to rival V8 on performance, so I would've thought it the obvious choice for new projects going forward.
https://github.com/graalvm/graaljs
Edit: found more info about this release in the initial announcement:
https://mail.openjdk.java.net/pipermail/nashorn-dev/2020-Oct...
> The preferred way to run GraalVM JavaScript is from a GraalVM. If you prefer running it on a stock JVM, please have a look at the documentation in RunOnJDK.md.
I'm running it on a stock OpenJDK JVM without any issue, just by including a Maven dependency. For best performance you should run it on GraalVM (where the Community Edition is based on OpenJDK).
https://github.com/graalvm/graaljs/blob/master/LICENSE
"The Universal Permissive License (UPL), Version 1.0"
And about the UPL:
https://tldrlegal.com/license/universal-permissive-license-1...
"... including an explicit patent grant, clear ability to relicense ..."
It depends, do you want support for your JVM? If so:
* Graal CE has no support
* Graal EE requires either running on Oracle Cloud or calling Oracle Sales for a custom quote. These are non-starters for many.
* JVMCI requires `-XX:+UnlockExperimentalVMOptions` which often voids support.
* I believe Mandrel is supported but requires RHEL