NPE in VirtualFlow

[Mario Ivankovits]

Hi!

Every now and then I get the exception down there (starting with JavaFX 
8u40-b18 if I remember correctly)

It seems it has something to to with the fact that the items list of one of my 
TableViews gets cleared and so no cells are visible any more.
I was not yet able to always reproduce that. I will try to do that, but 
probably someone has a clue anyway?

BR,
Mario

java.lang.NullPointerException
        at 
com.sun.javafx.scene.control.skin.VirtualFlow.getCellIndex(VirtualFlow.java:1726)
        at 
com.sun.javafx.scene.control.skin.VirtualFlow.addLeadingCells(VirtualFlow.java:1274)
        at 
com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1194)
        at 
com.sun.javafx.scene.control.skin.VirtualFlow.setCellCount(VirtualFlow.java:231)
        at 
com.sun.javafx.scene.control.skin.TableViewSkinBase.updateRowCount(TableViewSkinBase.java:554)
        at 
com.sun.javafx.scene.control.skin.VirtualContainerBase.checkState(VirtualContainerBase.java:113)
        at 
com.sun.javafx.scene.control.skin.VirtualContainerBase.layoutChildren(VirtualContainerBase.java:108)
        at 
com.sun.javafx.scene.control.skin.TableViewSkinBase.layoutChildren(TableViewSkinBase.java:683)
        at javafx.scene.control.Control.layoutChildren(Control.java:576)
        at javafx.scene.Parent.layout(Parent.java:1076)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Parent.layout(Parent.java:1082)
        at javafx.scene.Scene.doLayoutPass(Scene.java:552)
        at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)
        at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:314)
        at com.sun.javafx.tk.Toolkit$$Lambda$243/122134773.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:313)
        at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:340)
        at 
com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:525)
        at 
com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:505)
        at 
com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$400(QuantumToolkit.java:334)
        at 
com.sun.javafx.tk.quantum.QuantumToolkit$$Lambda$41/2090707712.run(Unknown 
Source)
        at 
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)