Collections.copy() do not seem to work. The following fails at least with two implementations: LinkedList and ArrayList, in production mode :

gistfile1.txt

List<String> l1 = new LinkedList<String>();
List<String> l2 = new LinkedList<String>();
//	    List<String> l1 = new ArrayList<String>();
//	    List<String> l2 = new ArrayList<String>();
// copy empty list
Collections.copy(l2, l1);
l1.add("A");
l2.add("B");
Collections.copy(l2, l1);
if(!l2.get(0).equals("A")) {
	Window.alert("error"); 
}