关于JDK1.6新增排序功能，当table为空会报数组越界的错误

    使用jdk1.6新增排序方法：jTable1.setAutoCreateRowSorter(true)，当table数据为空时会报数组越界的错误，错误信息如下：
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Vector.java:427)
at com.ruggedcom.comm.util.UnEditCheckTableModel.getColumnClass(UnEditCheckTableModel.java:15)
at javax.swing.table.TableRowSorter.useToString(TableRowSorter.java:224)
at javax.swing.DefaultRowSorter.updateUseToString(DefaultRowSorter.java:607)
at javax.swing.DefaultRowSorter.sort(DefaultRowSorter.java:556)
at javax.swing.DefaultRowSorter.setSortKeys(DefaultRowSorter.java:302)
at javax.swing.DefaultRowSorter.toggleSortOrder(DefaultRowSorter.java:463)
at javax.swing.plaf.basic.BasicTableHeaderUI$MouseInputHandler.mouseClicked(BasicTableHeaderUI.java:93)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
at java.awt.Component.processMouseEvent(Component.java:6044)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3995)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
     请问有没有好的解决办法，谢谢！