To Reproduce:

Run SwingSet2, throws the NPE, stack trace is attached

D:\test-JDK\7-b97-PIT\demo\jfc\SwingSet2>..\..\..\bin\java -jar SwingSet2.jar
Exception in thread "main" java.lang.NullPointerException
        at javax.swing.plaf.basic.BasicTabbedPaneUI$Handler.propertyChange(Basic
TabbedPaneUI.java:3530)
        at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)

        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:327)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:263)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:283)
        at java.awt.Component.firePropertyChange(Component.java:8347)
        at javax.swing.JComponent.firePropertyChange(JComponent.java:4510)
        at javax.swing.JTabbedPane.setTitleAt(JTabbedPane.java:1321)
        at SwingSet2.setDemo(SwingSet2.java:720)
        at SwingSet2.preloadFirstDemo(SwingSet2.java:672)
        at SwingSet2.<init>(SwingSet2.java:208)
        at SwingSet2.main(SwingSet2.java:229)