Read objects from a .class file

I'm trying to use Javassist in order to get all the instantiated objects in a .class file, however, I can't seem to find the way to do so, so I ask, is there any way to get, for example, an array of Objects from a .class file?

Here is the class from which I would like to get the instantiated objects:

public class Test {

    public static void main(String[] args){

        System.out.println(new Widget());
        System.out.println(new Widget("width", 80));
        System.out.println(new Widget("height", 30));
        System.out.println(new Widget("height", 20, "width", 90));

    }

}

Widget has a public Widget(Object ...args) {} constructor.

Thanks!