ConcurrentModification Exception on Sorting

I wrote this small program to sort arrays. To my understanding it should print 0,1,2.

However, when I run this program I am getting ConcurrentModificationException

    public class Test {
    public static void main(String[] args) {
    List<Double> l1 = new ArrayList<Double>(Arrays.asList(2., 0., 1.));
    List<Double> l2 = l1.subList(0, 3);
    Collections.sort(l1);
    System.out.println(l2.get(0));
    }
}

I am really not sure about the root cause of this exception.

Can somebody help me understand where I am making mistake ?

Note: This issue is not there on JAVA 7 , It would be great if some one also tell why it is there in JAVA 8 and not in JAVA 7