Java 9: Nashorn Scripting / Automation Improvement

Nashorn's $EXEC built-in function was extended to support Java's System.out and System.err as parameters:


#!/usr/bin/jjs -fv
var cmd = "mvn clean install"
var System = Java.type("java.lang.System");
$EXEC(cmd, System.in, System.out, System.err);

The code above executes Maven and "streams" the output in real time into the console. With Java 9 Nashorn is even more useful for cross-platform automation of OS-level tasks.

Docklands Dockerfiles come with Nashorn script: build.js.

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