如何将表头生成的工具提示添加到JTable单元？

Question

我有一个JTable，我正在尝试添加一个标题工具提示，它将显示每个标题单元格的表头中的字符串。我可以设置标题单元格的值：

colModel.getColumn(currentColumn).setHeaderValue(time + "(s)");

其中colModel：

TableColumnModel colModel = audioTable.getColumnModel();

为此，我添加了这个监听器：

audioTable = new JTable(modelAudio);
    JTableHeader header = audioTable.getTableHeader();
    header.addMouseMotionListener(new MouseMotionListener() {

        @Override
        public void mouseMoved(MouseEvent e) {
            System.out.println("mouseMoved");
            // TODO Auto-generated method stub

        }

        @Override
        public void mouseDragged(MouseEvent e) {
            System.out.println("mouseDragged");
            // TODO Auto-generated method stub

        }
    });

我看到mouseMoved在这个NPE之间反复打印：

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.synth.SynthTableHeaderUI$HeaderRenderer.getTableCellRendererComponent(Unknown Source)
at javax.swing.table.JTableHeader.getToolTipText(Unknown Source)
at javax.swing.ToolTipManager$insideTimerAction.actionPerformed(Unknown Source)
at javax.swing.Timer.fireActionPerformed(Unknown Source)
at javax.swing.Timer$DoPostEvent.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

我不知道如何获得更长的堆栈跟踪，这就是我创建表的方式：

modelAudio = new DefaultTableModel();
modelAudio.addColumn(" ");
audioTable = new JTable(modelAudio);

我想要做的棘手的事情是动态添加列，所以每次用户填充当前列时都会添加一列，如下所示：

TableColumn tc = new TableColumn(modelAudio.getColumnCount());
tc.setHeaderValue(" ");
audioTable.addColumn(tc);
modelAudio.addColumn(tc);

我添加列的方式是导致此NPE的问题吗？