java.lang.NullPointerException
   at org.netbeans.modules.profiler.heapwalk.ui.ClassesListControllerUI$ClassesListTableModel.setSelectedClass(ClassesListControllerUI.java:306)
   at org.netbeans.modules.profiler.heapwalk.ui.ClassesListControllerUI$ClassesListTableModel$3.run(ClassesListControllerUI.java:357)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
   at java.awt.EventQueue.access$000(EventQueue.java:96)
   at java.awt.EventQueue$1.run(EventQueue.java:608)
   at java.awt.EventQueue$1.run(EventQueue.java:606)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:617)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)