java.lang.AssertionError: Seeking for: 'NewClass2.java'@1441a6c parent: null indexOf: -1
with parent: 'xx.yy'@22e8b4 parent: org.openide.explorer.view.VisualizerChildren@1ffeb65 indexOf: 1
Seeking in : org.openide.explorer.view.VisualizerChildren@d37de6
  0 = 'NewJFrame.java'@1db8284 parent: org.openide.explorer.view.VisualizerChildren@d37de6 indexOf: 1
  1 = 'NewJFrame.java'@1db8284 parent: org.openide.explorer.view.VisualizerChildren@d37de6 indexOf: 1

        at org.openide.explorer.view.VisualizerChildren.getIndex(VisualizerChildren.java:159)
        at org.openide.explorer.view.VisualizerNode.getIndex(VisualizerNode.java:281)
        at javax.swing.tree.DefaultTreeModel.getIndexOfChild(DefaultTreeModel.java:142)
        at javax.swing.tree.FixedHeightLayoutCache.getBounds(FixedHeightLayoutCache.java:176)
        at javax.swing.plaf.basic.BasicTreeUI.getPathBounds(BasicTreeUI.java:515)
        at javax.swing.plaf.basic.BasicTreeUI.getPathBounds(BasicTreeUI.java:508)
        at javax.swing.JTree.getPathBounds(JTree.java:2066)
        at org.openide.explorer.view.TreeViewCellEditor.checkContinueTimer(TreeViewCellEditor.java:321)
        at org.openide.explorer.view.TreeViewCellEditor.mouseMoved(TreeViewCellEditor.java:294)
        at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:313)
        at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:312)
        at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:312)
        at java.awt.AWTEventMulticaster.mouseMoved(AWTEventMulticaster.java:312)
        at java.awt.Component.processMouseMotionEvent(Component.java:6179)
        at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3283)
        at java.awt.Component.processEvent(Component.java:5903)
        at java.awt.Container.processEvent(Container.java:2023)
        at org.openide.explorer.view.TreeView$ExplorerTree.doProcessEvent(TreeView.java:1643)
        at org.openide.explorer.view.TreeView$ExplorerTree.access$1900(TreeView.java:1499)
        at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.run(TreeView.java:1996)
        at org.openide.util.Mutex.readAccess(Mutex.java:285)
        at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.<init>(TreeView.java:1978)
        at org.openide.explorer.view.TreeView$ExplorerTree.processEvent(TreeView.java:1638)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3978)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895)
        at java.awt.Container.dispatchEventImpl(Container.java:2067)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)