Although I add the ScrollController to the ListView, the client of the ScrollController does not appear. Result of print : ScrollController#a6158(no clients)

ScrollController sc = new ScrollController();
ListView(
  controller: sc,
  padding: const EdgeInsets.all(8.0),
  children: <Widget>[
    Container(
      height: 150,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 150,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 150,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
  ],
);
print(sc.toString());