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JList & Observer

 
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Hi Guys,
I am developing simple chat application and I have a problem with JList:
ChatWindow extends JFrame implements Observer {
// ---
private JList onlineUsersList = new JList();
public ChatWindow() {
Container contentPane = getContentPane();
contentPane.add(new JScrollPane(onlineUsersList),
BorderLayout.EAST);
DefaultListModel model = new DefaultListModel();
onlineUsersList.setModel(model);
// ----
}

public void update(Observable obs, Object obj) {
final DefaultListModel model =
(DefaultListModel) onlineUsersList.getModel();
model.addElement("From update");
onlineUsersList.setModel(model);
}
}
What's wrong here ?
Thanks.
 
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