InvokeScriptFunction.java

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import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

@SuppressWarnings("javadoc")
public class InvokeScriptFunction {
    public static void main(final String[] args) throws Exception {
        final ScriptEngineManager manager = new ScriptEngineManager();
        final ScriptEngine engine = manager.getEngineByName("nashorn");

        // JavaScript code in a String
        final String script = "function hello(name) { print('Hello, ' + name); }";
        // evaluate script
        engine.eval(script);

        // javax.script.Invocable is an optional interface.
        // Check whether your script engine implements or not!
        // Note that the JavaScript engine implements Invocable interface.
        final Invocable inv = (Invocable) engine;

        // invoke the global function named "hello"
        inv.invokeFunction("hello", "Scripting!!" );
    }
}