In Java 8 the javascript engine RHINO is replaced by NASHORN

Currently JobScheduler requires Java 7 to be used.

In Java 8 it might be a problem to run JavaScript jobs using the Rhino scripting engine as for Java 8 Rhino is replaced by Nashorn, which does not support the importClass statement anymore (see http://www.oracle.com/technetwork/articles/java/jf14-nashorn-2126515.html for details).

With JRE 8 the Nashorn engine can be used by selecting the script language: javax.script:ecmascript

see What are the differences between the SpiderMonkey, Rhino and Nashorn scripting engines?