Does the Fantom programming language, either directly or via a third-party implementation, support JSR-223? That is, can Fantom be used to script Java objects via the 'javax.script' API?
Just realised that this question still has no accepted answer. So, to answer it myself...
No - Fantom does not support JSR-223. (As of 15 May 2015.)
There have been no further comments on the Fantom blog (re http://fantom.org/forum/topic/2127 or otherwise). There appears to be nothing on the interweb re 'Fantom', 'javax.script' and 'JSR-223' as far as an implementation for Fantom goes.