Exception in one JFXPanel kills other JFXPanels, too

Artem Ananiev artem.ananiev at oracle.com
Tue Aug 13 06:10:06 PDT 2013

Hi, Werner,

it looks like a bug in JFXPanel, could you file it to JIRA with a test 
case, please?



On 8/13/2013 2:32 PM, Werner Lehmann wrote:
> Hi,
> I have noticed the following problem with exception handling and
> multiple JFXPanels (FX 2.2):
> 1. Two JFXPanels, J1 and J2
> 2. Throw NPE in layoutChildren of a control inside J1
> This would print a stacktrace (see below). Then J2 is blocked: mouse
> clicks have no effect anymore. I think I have seen something similar
> with invalid FXML but did not check again now. On the other hand, if a
> button action-event handler throws an exception everything is fine:
> stacktrace is printed but the JFXPanels stay alive.
> What is the deal here? When are exceptions "lethal", and what can I do
> to protect against this, preferably without adding a try..catch to each
> layoutChildren (and whereever else this might be needed)...
> Werner
>> java.lang.NullPointerException: kaboom
>>     at
>> mint.javafx.scene.layout.designerpane.MintDesignerPane.layoutChildren(MintDesignerPane.java:192)
>>     at javafx.scene.Parent.layout(Parent.java:1018)
>>     at javafx.scene.Parent.layout(Parent.java:1028)
>>     at javafx.scene.Scene.layoutDirtyRoots(Scene.java:513)
>>     at javafx.scene.Scene.doLayoutPass(Scene.java:484)
>>     at javafx.scene.Scene.access$3900(Scene.java:169)
>>     at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2199)
>>     at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:363)
>>     at
>> com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:460)
>>     at
>> com.sun.javafx.tk.quantum.QuantumToolkit$9.run(QuantumToolkit.java:329)
>>     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
>>     at
>> com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
>>     at
>> com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
>>     at java.lang.Thread.run(Unknown Source)

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