Nashorn alternative for Java 11

Update (June 2022):

As of 2022, it seems J2V8 is also poorly maintained.

Better set your sights on Javet

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If someone still finds this question relevant, a viable, still actively maintained alternative to Nashorn/Rhino script engines is the J2V8 binding for the JVM.

Artifacts can be found here (be sure to use this link to get updated releases)

Multi-platform support is builtin via JNI

Though its mechanics are a bit different than those of the ScriptEngine API, performance is (as expected) better. and you don't have to deal with weird side effects like unintended class-loading caused by misuse of the API.

I have successfully used it myself in the past.

You can use Rhino as replacement

Rhino still is being maintained as an open-source project and so has a history of community involvement. For some uses, it’s clearly superior because of its faster startup time.