callfunc.js

/*
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// simple example showing how to call a global script
// function from caller

var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");
// create manager
var manager = new ScriptEngineManager();
// create engine
var engine = manager.getEngineByName("js");

// eval code!
engine.eval("function func(name) { print('I am func, hello ' + name) }");

// invoke functions, methods of code evaluated by engine
// from javax.script.Invocable interface. But, hey,
// calling code is JavaScript and don't worry about types :)

engine.invokeFunction("func", "Nashorn");