Javatest can throw NPE if Wizard is being executed separately from test suite and without workdir.
JCK interview developers use this "developer" interview mode for debugging purposes.
Not a critical issue. Not related to TCK products. This can not be reproduced using the full TCK and existing work directory.

The reason why I filed this is: getting (and throwing) NPEs is basically not a good thing.

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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.sun.javatest.interview.TestsInterview$5.getRoot(TestsInterview.java:326)
at com.sun.interview.wizard.TreeQuestionRenderer.getQuestionRendererComponent(TreeQuestionRenderer.java:47)
at com.sun.interview.wizard.QuestionPanel.showQuestion(QuestionPanel.java:439)
at com.sun.interview.wizard.QuestionPanel$Listener.currentQuestionChanged(QuestionPanel.java:676)
at com.sun.interview.Interview.notifyCurrentQuestionChanged(Interview.java:1904)
at com.sun.interview.Interview.setCurrentQuestion(Interview.java:862)
at com.sun.interview.wizard.PathPanel$PathList.valueChanged(PathPanel.java:551)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1798)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1812)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:184)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:164)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:211)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:405)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:415)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:459)
at javax.swing.JList.setSelectionInterval(JList.java:2067)
at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2739)
at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2695)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)
at java.awt.Component.processMouseEvent(Component.java:6519)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3322)
at java.awt.Component.processEvent(Component.java:6287)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4878)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4700)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4872)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4457)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2724)
at java.awt.Component.dispatchEvent(Component.java:4700)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:743)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:716)
at java.awt.EventQueue$4.run(EventQueue.java:714)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:713)
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)