private boolean isClassBox(String owner) {

            if (!owner.startsWith("java/lang/")) {
                return false;
            }

            String className = owner.substring("java/lang/".length());

            return (className.equals("Integer") ||
                    className.equals("Double") ||
                    className.equals("Long") ||
                    className.equals("Char") ||
                    className.equals("Byte") ||
                    className.equals("Boolean")) ||
                   className.endsWith("Number");
        }