Message11339

Regarding java.io.Console.encoding I'd suggest first immediate action would be to try/catch the illegal access.

Then we can fallback to some default value or maybe we can call:

https://github.com/jline/jline2/blob/master/src/main/java/jline/internal/Configuration.java#L225
(Jython bundles JLine already)

If that isn't sufficient, we can maybe implement something like

http://mail.openjdk.java.net/pipermail/core-libs-dev/2016-September/043638.html

for the major platforms via JNI. (If possible add it to the launcher.)
I will also try if maybe a JNI-call to java.io.Console.encoding still permits the access (as JNI calls traditionally do) without  the exception.

Regarding jnr, we'll have to try most recent version and if that fails, raising a bug at their tracker (i.e. making it a SEP :-) https://en.wikipedia.org/wiki/Somebody_else's_problem) -- I suppose jnr also wants to be conveniently workable on Java 9.