java.lang.ArrayIndexOutOfBoundsException when running SwingSet2 demo

Steps to reproduce:
1. Run SwingSet2 demo
2. Click on "Source" tab

Actual result:
The following exception occurs.

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 342
        at javax.swing.text.CompositeView.getView(CompositeView.java:160)
        at javax.swing.text.View.forwardUpdate(View.java:1151)
        at javax.swing.text.BoxView.forwardUpdate(BoxView.java:240)
        at javax.swing.text.View.changedUpdate(View.java:788)
        at javax.swing.text.html.BlockView.changedUpdate(BlockView.java:341)
        at javax.swing.text.View.forwardUpdateToView(View.java:1212)
        at javax.swing.text.View.forwardUpdate(View.java:1183)
        at javax.swing.text.BoxView.forwardUpdate(BoxView.java:240)
        at javax.swing.text.View.changedUpdate(View.java:788)
        at javax.swing.text.html.BlockView.changedUpdate(BlockView.java:341)
        at javax.swing.text.View.forwardUpdateToView(View.java:1212)
        at javax.swing.text.View.forwardUpdate(View.java:1183)
        at javax.swing.text.BoxView.forwardUpdate(BoxView.java:240)
        at javax.swing.text.View.changedUpdate(View.java:788)
        at javax.swing.text.html.BlockView.changedUpdate(BlockView.java:341)
        at javax.swing.plaf.basic.BasicTextUI$RootView.changedUpdate(BasicTextUI.java:1630)
        at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.changedUpdate(BasicTextUI.java:1891)
        at javax.swing.text.AbstractDocument.fireChangedUpdate(AbstractDocument.java:230)
        at javax.swing.text.html.HTMLDocument.fireChangedUpdate(HTMLDocument.java:1729)
        at javax.swing.text.html.HTMLDocument$HTMLReader.adjustEndElement(HTMLDocument.java:2470)
        at javax.swing.text.html.HTMLDocument$HTMLReader.flush(HTMLDocument.java:2525)
        at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:263)
        at javax.swing.JEditorPane.setText(JEditorPane.java:1415)
        at SwingSet2$5.run(SwingSet2.java:1042)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
        at java.awt.EventQueue.access$400(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:688)
        at java.awt.EventQueue$3.run(EventQueue.java:685)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:220)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:135)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:123)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:119)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:111)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)


Expected result: No exceptions should be thrown.