NPE in VirtualFlow

[Chien Yang]

The closest I can find that is somewhat related to TableView and NPE, 
but not exactly the same issue is the following JIRA:

https://javafx-jira.kenai.com/browse/RT-39624

Please file a JIRA once you have a reproducible test case ready. Here is 
a link on how to file a bug report with us:
https://wiki.openjdk.java.net/display/OpenJFX/Submitting+a+Bug+Report

Thanks,
- Chien

On 12/26/2014 1:30 AM, Mario Ivankovits wrote:
> 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)
>