遇到swing里tab页的数组越界问题,跪求swing高手出手！！！

以下是唯一得到的异常，但是我从异常中看不出来问题出在哪里。希望能得到高手的指点。希望能给出较为直接的提示，因为我swing比较白。
小弟在此谢过了！！Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 4 >= 4
at java.util.Vector.elementAt(Vector.java:427)
at javax.swing.plaf.basic.BasicTabbedPaneUI.getTextViewForTab(BasicTabbedPaneUI.java:1688)
at javax.swing.plaf.basic.BasicTabbedPaneUI.calculateTabHeight(BasicTabbedPaneUI.java:1699)
at javax.swing.plaf.basic.BasicTabbedPaneUI.calculateMaxTabHeight(BasicTabbedPaneUI.java:1724)
at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.preferredTabAreaHeight(BasicTabbedPaneUI.java:2331)
at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateSize(BasicTabbedPaneUI.java:2315)
at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.preferredLayoutSize(BasicTabbedPaneUI.java:2261)
at java.awt.Container.preferredSize(Container.java:1597)
at java.awt.Container.getPreferredSize(Container.java:1582)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1636)
at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateSize(BasicTabbedPaneUI.java:2287)
at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.preferredLayoutSize(BasicTabbedPaneUI.java:2261)
at java.awt.Container.preferredSize(Container.java:1597)
at java.awt.Container.getPreferredSize(Container.java:1582)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1636)
at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:1092)
at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:893)
at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:2048)
at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:2008)
at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:789)
at java.awt.Container.layout(Container.java:1419)
at java.awt.Container.doLayout(Container.java:1408)
at java.awt.Container.validateTree(Container.java:1505)
at java.awt.Container.validateTree(Container.java:1511)
at java.awt.Container.validateTree(Container.java:1511)
at java.awt.Container.validate(Container.java:1478)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:670)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1635)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:607)
at java.awt.EventQueue$1.run(EventQueue.java:605)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)