Get parsed groovy script methods

There are two ways to invoke your method:

1. You can search for it in script.getMetaClass().getMethods()

public static void main(String[] args) {
    GroovyShell shell = new GroovyShell();
    Script script = shell.parse("def myStuff(a){ return a }");

    script.getMetaClass()
            .getMethods()
            .stream()
            .filter(it -> it.getName().equals("myStuff"))
            .findAny()
            .ifPresent(method -> {
                final Object result = method.doMethodInvoke(script, new Object[]{3});
                System.out.println("result = " + result);
            });
}

Output:

result = 3

2. You can use script.invokeMethod(String name, Object args)

public static void main(String[] args) {
    GroovyShell shell = new GroovyShell();
    Script script = shell.parse("def myStuff(a){ return a }");

    System.out.println(script.invokeMethod("myStuff", 5));
}

Output:

5