Layout regression

[Stephen F Northover]

Thanks Scott.  It maybe that if you can't isolate a case, you can build 
FX from source (easy on Mac or Linux) and add some prints and debugging 
code.  See you in the JIRA!

Steve

On 2014-05-22 3:55 PM, Scott Palmer wrote:
> This appears to be a bug introduced in JavaFX 8
> I have filed https://javafx-jira.kenai.com/browse/RT-37252 and will
> work on a test case.
>
> Scott
>
> On Thu, May 22, 2014 at 3:45 PM, Scott Palmer <swpalmer at gmail.com> wrote:
>> I'm investigating an issue with my application where things are
>> working fine running with JavaFX 2.2 on 7u55, but I have a particular
>> case where 8u5 is throwing the following exception during layout:
>>
>> Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
>> at javafx.scene.layout.GridPane.computeMinHeights(GridPane.java:1450)
>> at javafx.scene.layout.GridPane.computeMinHeight(GridPane.java:1224)
>> at javafx.scene.Parent.minHeight(Parent.java:946)
>> at javafx.scene.layout.Region.minHeight(Region.java:1404)
>> at javafx.scene.layout.Region.computeChildMinAreaHeight(Region.java:1700)
>> at javafx.scene.layout.Region.getMaxAreaHeight(Region.java:1981)
>> at javafx.scene.layout.Region.computeMaxMinAreaHeight(Region.java:1854)
>> at javafx.scene.layout.StackPane.computeMinHeight(StackPane.java:293)
>> at javafx.scene.Parent.minHeight(Parent.java:946)
>> at javafx.scene.layout.Region.minHeight(Region.java:1404)
>> at javafx.scene.layout.Region.computeChildPrefAreaHeight(Region.java:1765)
>> at javafx.scene.layout.Region.getMaxAreaHeight(Region.java:1982)
>> at javafx.scene.layout.Region.computeMaxPrefAreaHeight(Region.java:1884)
>> at javafx.scene.layout.StackPane.computePrefHeight(StackPane.java:310)
>> at javafx.scene.Parent.prefHeight(Parent.java:918)
>> at javafx.scene.layout.Region.prefHeight(Region.java:1438)
>> at com.sun.javafx.scene.control.skin.TitledPaneSkin.computePrefHeight(TitledPaneSkin.java:249)
>> at javafx.scene.control.Control.computePrefHeight(Control.java:543)
>> at javafx.scene.Parent.prefHeight(Parent.java:918)
>> at javafx.scene.layout.Region.prefHeight(Region.java:1438)
>> at javafx.scene.layout.Region.computeChildPrefAreaHeight(Region.java:1765)
>> at javafx.scene.layout.GridPane.computePrefHeights(GridPane.java:1407)
>> at javafx.scene.layout.GridPane.computePrefHeight(GridPane.java:1242)
>> at javafx.scene.Parent.prefHeight(Parent.java:918)
>> at javafx.scene.layout.Region.prefHeight(Region.java:1438)
>> at com.sun.javafx.scene.control.skin.ScrollPaneSkin.computeScrollNodeSize(ScrollPaneSkin.java:916)
>> at com.sun.javafx.scene.control.skin.ScrollPaneSkin.layoutChildren(ScrollPaneSkin.java:791)
>> at javafx.scene.control.Control.layoutChildren(Control.java:574)
>> 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.Parent.layout(Parent.java:1082)
>> at javafx.scene.Parent.layout(Parent.java:1082)
>> at javafx.scene.Scene.doLayoutPass(Scene.java:576)
>> at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2386)
>> at com.sun.javafx.tk.Toolkit$3.run(Toolkit.java:321)
>> at com.sun.javafx.tk.Toolkit$3.run(Toolkit.java:319)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:319)
>> at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:348)
>> at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:479)
>> at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:460)
>> at com.sun.javafx.tk.quantum.QuantumToolkit$13.run(QuantumToolkit.java:327)
>> at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
>> at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
>> at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
>> at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
>> at java.lang.Thread.run(Thread.java:745)
>>
>> As you can see, it's all JavaFX code on the stack, so this is a little
>> tricky to debug.  As such I'm not sure yet if this is a JavaFX bug
>> introduced with 8.0 or an application bug that was masked in JavaFX
>> 2.2 and is now showing up in JavaFX 8.
>>
>> This happens when the managed/visible state of children changes.. but
>> I think it only for the case when all the children become unmanaged.
>>
>> Once it happens JavaFX is crippled and pretty much all layout is
>> broken.  Popups (menus) still work and I can exit the application, but
>> all layout in the main window seems to not happen anymore.  Manual
>> positioning of nodes still works though.
>>
>> I'll try to isolate a reproducible test case and file a bug report of course.
>>
>> Scott