How to properly call GroovyScriptEngine? - groovy

Question

I'm testing Groovy but I can't figure out how to properly call GroovyScriptEngine. It keeps producing an error below.
org.codehaus.groovy.runtime.metaclass.MissingMethodExceptionNoStack
Song.Groovy
class Song {
def args;
{
println "Song has been called." + args;
}
String getArtist(){
return "sdfsdf";
}
public String toString(){
return "Hey!";
}
}
Java Main ->
String[] paths = { "C:\\Users\\User\\workspace\\GroovyTest\\src\\groovy" };
GroovyScriptEngine gse = new GroovyScriptEngine(paths);
Binding binding = new Binding();
Object s = "Default...";
binding.setVariable("args", s);
gse.run("Song.groovy", binding);
the args variable also produce null..
What to do ?

Answer 1

You are loading a class!
If you want to test your class, try something like this in the end of your Song.groovy:
// Instantiate an object of your class and use some methods!
def song = new Song()
println song.getArtist();
When you run
gse.run("Song.groovy", binding);
You are basically loading your class, but you are not doing anything with it.
See this example here

Answer 2

(Posted on behalf of the OP):
Working code:
Test1.java
import groovy.lang.Binding;
import groovy.util.GroovyScriptEngine;
public class Test1 {
public static void main(String[] args) throws Exception {
String[] paths = { "C:\\Users\\User\\workspace\\GroovyTest\\src\\groovy" };
GroovyScriptEngine gse = new GroovyScriptEngine(paths);
Binding binding = new Binding();
binding.setVariable("args", "Test Data");
String result = (String) gse.run("File1.groovy", binding);
System.out.println("Groovy Result: " + result);
}
}
File1.groovy
package groovy;
class Greeter {
String sayHello(String data) {
def greet = data;
return greet
}
}
static void main(String[] args) {
def greeter = new Greeter()
return greeter.sayHello(args);
}