java.lang.AssertionError: visnodes.size()=16 snapshot.size()=8
        at org.openide.explorer.view.VisualizerChildren.recomputeIndexes(VisualizerChildren.java:88)
        at org.openide.explorer.view.VisualizerChildren.added(VisualizerChildren.java:224)
        at org.openide.explorer.view.VisualizerEvent$Added.run(VisualizerEvent.java:106)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.util.Mutex$1R.run(Mutex.java:1301)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1318)
        at org.openide.util.Mutex.readAccess(Mutex.java:351)
        at org.openide.explorer.view.VisualizerNode$QP.run(VisualizerNode.java:676)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.writeAccess(Mutex.java:452)
        at org.openide.explorer.view.VisualizerNode$QP.runSafe(VisualizerNode.java:658)
        at org.openide.explorer.view.VisualizerNode.childrenAdded(VisualizerNode.java:356)
Caused: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor64.invoke(GeneratedMethodAccessor64.java:0)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:451)
Caused: java.lang.reflect.UndeclaredThrowableException
        at $Proxy7.childrenAdded(.java:0)
        at org.openide.nodes.Node.fireSubNodesChange(Node.java:1093)
        at org.openide.nodes.EntrySupport$Default.notifyAdd(EntrySupport.java:694)
        at org.openide.nodes.EntrySupport$Default.updateAdd(EntrySupport.java:520)
        at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:348)
        at org.openide.nodes.Children$Keys$2.run(Children.java:1504)
        at org.openide.util.Mutex$1Exec.run(Mutex.java:1239)
        at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1811)
        at org.openide.util.Mutex.postRequest(Mutex.java:1245)
        at org.openide.util.Mutex.postRequest(Mutex.java:1209)
        at org.openide.util.Mutex.postWriteRequest(Mutex.java:582)
        at org.openide.nodes.Children$Keys.applyKeys(Children.java:1513)
        at org.openide.nodes.Children$Keys.setKeys(Children.java:1457)
        at org.netbeans.modules.csl.navigation.ElementNode$ElementChildren.resetKeys(ElementNode.java:320)
        at org.netbeans.modules.csl.navigation.ElementNode.updateRecursively(ElementNode.java:266)
        at org.netbeans.modules.csl.navigation.ElementNode.updateRecursively(ElementNode.java:278)
        at org.netbeans.modules.csl.navigation.ClassMemberPanelUI$3.run(ClassMemberPanelUI.java:210)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)