JavaFX dialog exception

Question

I get an exception from my costum dialog right at the moment when I click the close button.

Exception in thread "JavaFX Application Thread" java.lang.IllegalStateException: Nested event loops are allowed only while handling system events
    at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(Unknown Source)
    at javafx.stage.Stage.showAndWait(Unknown Source)
    at javafx.scene.control.HeavyweightDialog.showAndWait(Unknown Source)
    at javafx.scene.control.Dialog.showAndWait(Unknown Source)
    at puni.view.CustomDialog.showReport(CustomDialog.java:251)
    at puni.view.OverviewController.showReportDialog(OverviewController.java:1088)
    at puni.view.OverviewController.startOverview(OverviewController.java:1136)
    at puni.view.OverviewController.access$0(OverviewController.java:1095)
    at puni.view.OverviewController$3.handle(OverviewController.java:538)
    at puni.view.OverviewController$3.handle(OverviewController.java:1)
    at javafx.animation.Animation.impl_finished(Unknown Source)
    at javafx.animation.AnimationAccessorImpl.finished(Unknown Source)
    at com.sun.scenario.animation.shared.SingleLoopClipEnvelope.timePulse(Unknown Source)
    at javafx.animation.Animation.impl_timePulse(Unknown Source)
    at javafx.animation.Animation$1.lambda$timePulse$26(Unknown Source)
    at javafx.animation.Animation$1$$Lambda$246/14625425.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at javafx.animation.Animation$1.timePulse(Unknown Source)
    at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(Unknown Source)
    at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$400(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit$$Lambda$40/6985548.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
    at com.sun.glass.ui.win.WinApplication$$Lambda$36/3326003.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)


Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: Key not associated with a running event loop: javafx.scene.control.HeavyweightDialog$1@1a9ed1e
    at com.sun.javafx.tk.quantum.QuantumToolkit.exitNestedEventLoop(Unknown Source)
    at javafx.stage.Stage.impl_visibleChanged(Unknown Source)
    at javafx.stage.Window$9.invalidated(Unknown Source)
    at javafx.beans.property.BooleanPropertyBase.markInvalid(Unknown Source)
    at javafx.beans.property.BooleanPropertyBase.set(Unknown Source)
    at javafx.stage.Window.setShowing(Unknown Source)
    at javafx.stage.Window.hide(Unknown Source)
    at javafx.scene.control.HeavyweightDialog.close(Unknown Source)
    at javafx.scene.control.Dialog.close(Unknown Source)
    at puni.view.CustomDialog$1.handle(CustomDialog.java:222)
    at puni.view.CustomDialog$1.handle(CustomDialog.java:1)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
    at javafx.event.Event.fireEvent(Unknown Source)
    at javafx.scene.Node.fireEvent(Unknown Source)
    at javafx.scene.control.Button.fire(Unknown Source)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
    at javafx.event.Event.fireEvent(Unknown Source)
    at javafx.scene.Scene$MouseHandler.process(Unknown Source)
    at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
    at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$258/29661310.get(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.notifyMouse(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
    at com.sun.glass.ui.win.WinApplication$$Lambda$36/3326003.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

What do you have at line CustomDialog.java:251? – Uluk Biy Aug 05 '15 at 06:19 — Uluk Biy, Aug 05 '15 at 06:19
Thats the showAndWait(); Method call – Punika Aug 05 '15 at 06:22 — Punika, Aug 05 '15 at 06:22

score 3 · Answer 1 · answered Aug 05 '15 at 07:40

3

I solved the issue by using Platform.runLater();

Platform.runLater(new Runnable(){
    @Override
    public void run() {
        dialog.showAndWait();               
    }           
});

This works but is that a good solution and what is the background of the exception?

answered Aug 05 '15 at 07:40

Punika

354
3
16

hmm .. sounds like a hack (which might bite you in future, as all hacks do ;-) Helping you to dig to the bottom of the problem requires a SSCCE that demonstrates the problem. – kleopatra Aug 06 '15 at 08:32
Your are right. Do you mean I should post the affected code or what does SSCCE mean ^^ – Punika Aug 07 '15 at 08:52
1

well, you do have access to a search machine, don't you ;-) Also, don't forget to read the help topic of this site about how to ask for maximum help (the acronym - MVCE (?) - is different, but meaning the same) – kleopatra Aug 07 '15 at 09:31

score 0 · Answer 2 · answered Aug 05 '15 at 07:56

I'm not an JavaFX expert, so this is mostly guessing:

The use of runLater() takes the action out of the event loop of the dialog window and moves it onto the main event loop of the application. This might prevent further nesting which seems to cause the problem.

The lack of information or code makes this kinda hard to understand.

JavaFX dialog exception

2 Answers2