在包含JTable的JScrollPane中未调用TableModel

我的Java GUI出现意外行为。我想创建一个JScrollPane包含，JTable然后将其添加JScrollPane到中Frame。

这是代码：

public class UrlsScrollPanel extends JScrollPane {
private static final long serialVersionUID = 1L;

public UrlsScrollPanel() {

    //setup urls and collections
    ArrayList<URL> urls = URL.getAll();
    ArrayList<Collection> collections = new ArrayList<>();
    for(URL url : urls) collections.add(new Collection(url));

    //table
    String[] columns = {            
        "database",
        "status",
        "consumption",
        "last snapshot date",
        "last message",
        "details",
        "stop collect"
    };  

    AbstractTableModel dataModel = new AbstractTableModel() {
        private static final long serialVersionUID = 1L;

        @Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            System.out.printf("row: %d, column: %d \n", rowIndex, columnIndex); //is never called.
            URL url = urls.get(rowIndex);
            Collection collection = collections.get(rowIndex); 
            ArrayList<Message> lastMessages = collection.getLastSnapshot().getMessages();
            Message lastMessage = lastMessages.get(lastMessages.size() - 1);

            if(columnIndex == 0) return url.toString();
            if(columnIndex == 1) return collection.getStatus(); 
            if(columnIndex == 2) return ConsumptionChart.getChartPanel(collection);
            if(columnIndex == 3) return collection.getLastSnapshot().getDate();
            if(columnIndex == 4) return String.format("[ %s ] %s", lastMessage.getDate(), lastMessage.getBody()); 
            return "Comming soon.";
        }

        @Override
        public int getRowCount() {
            return urls.size();
        }

        @Override
        public int getColumnCount() {
            return columns.length;
        }

        @Override
        public boolean isCellEditable(int row, int column) {
            return false;
        }
    };
    JTable table = new JTable(dataModel);
    add(table);
    setBackground(Color.red);
    setSize(500, 500);
}
}

这就是我所说的：

public static void main(String[] args) {        
    JFrame frame = new JFrame();
    frame.setVisible(true);
    frame.setResizable(true);
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH );
    frame.setLocationRelativeTo(null);
    UrlsScrollPanel panel = new UrlsScrollPanel();
    frame.add(panel, BorderLayout.CENTER);
    SwingUtilities.updateComponentTreeUI(frame);
}

结果是红色正方形在框的左上方闪烁，然后立即消失。也dataModel似乎永远不会被调用。

非常感谢您对我做错的事情的帮助，感谢您的宝贵时间！