ConcurrentModificationException when calling stage.show()

Kevin Rushforth kevin.rushforth at oracle.com
Mon Sep 5 17:47:15 UTC 2022 

I suspect a JavaFX bug, unless there some other thread not shown in your 
stack trace that is modifying any object in the now-live scene graph.

-- Kevin


On 9/5/2022 6:34 AM, Daniel Peintner wrote:
> All,
>
> I have a strange issue popping up once in a while.
> I have an application (FXML+ Controller) that has a "new" button 
> opening a new window. In 99% percent of the cases this works just fine.
>
> In some rare cases though, stage.show() fails due to a 
> ConcurrentModificationException. Since this issue does not happen in 
> my code but rather in JavaFX code I wanted to ask whether there is a 
> specific prerequisite I am not aware of or whether this is a bug in 
> JavaFX.
>
> Attached the stack trace. Unfortunately I am not able to create a 
> reproducible example that fails always.
>
> I am grateful for any tip.
>
> Thanks,
>
> -- Daniel
>
>
> Exception in thread "JavaFX Application Thread" 
> java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
> at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1857)
> at 
> javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1724)
> at 
> com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
> at 
> com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
> at 
> com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
> at 
> com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
> at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
> at javafx.event.Event.fireEvent(Event.java:198)
> at javafx.scene.Node.fireEvent(Node.java:8797)
> at javafx.scene.control.Button.fire(Button.java:203)
> at 
> com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:208)
> at 
> com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
> at 
> com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:247)
> at 
> com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
> at 
> com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
> at 
> com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
> at 
> com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at 
> com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
> at 
> com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
> at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
> at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
> at javafx.event.Event.fireEvent(Event.java:198)
> at javafx.scene.Scene$MouseHandler.process(Scene.java:3881)
> at javafx.scene.Scene.processMouseEvent(Scene.java:1874)
> at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2607)
> at 
> com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:411)
> at 
> com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:301)
> at 
> java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
> at 
> com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:450)
> at 
> com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:424)
> at 
> com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:449)
> at com.sun.glass.ui.View.handleMouseEvent(View.java:551)
> at com.sun.glass.ui.View.notifyMouse(View.java:937)
> at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
> at 
> com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
> at java.base/java.lang.Thread.run(Thread.java:833)
> Caused by: java.lang.reflect.InvocationTargetException
> at 
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
> Method)
> at 
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
> at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:568)
> at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:77)
> at 
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
> Method)
> at 
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
> at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:568)
> at com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
> at com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:84)
> at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1854)
> ... 50 more
> Caused by: java.util.ConcurrentModificationException
> at 
> java.base/java.util.AbstractList$Itr.checkForComodification(AbstractList.java:399)
> at java.base/java.util.AbstractList$Itr.next(AbstractList.java:368)
> at 
> javafx.scene.control.skin.MenuBarSkin.updateActionListeners(MenuBarSkin.java:810)
> at 
> javafx.scene.control.skin.MenuBarSkin.updateActionListeners(MenuBarSkin.java:811)
> at javafx.scene.control.skin.MenuBarSkin.rebuildUI(MenuBarSkin.java:1017)
> at javafx.scene.control.skin.MenuBarSkin.<init>(MenuBarSkin.java:356)
> at javafx.scene.control.MenuBar.createDefaultSkin(MenuBar.java:202)
> at javafx.scene.control.Control.doProcessCSS(Control.java:899)
> at javafx.scene.control.Control$1.doProcessCSS(Control.java:89)
> at 
> com.sun.javafx.scene.control.ControlHelper.processCSSImpl(ControlHelper.java:67)
> at com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:146)
> at javafx.scene.Parent.doProcessCSS(Parent.java:1400)
> at javafx.scene.Parent$1.doProcessCSS(Parent.java:125)
> at com.sun.javafx.scene.ParentHelper.processCSSImpl(ParentHelper.java:98)
> at com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:146)
> at javafx.scene.Parent.doProcessCSS(Parent.java:1400)
> at javafx.scene.Parent$1.doProcessCSS(Parent.java:125)
> at com.sun.javafx.scene.ParentHelper.processCSSImpl(ParentHelper.java:98)
> at com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:146)
> at javafx.scene.Parent.doProcessCSS(Parent.java:1400)
> at javafx.scene.Parent$1.doProcessCSS(Parent.java:125)
> at com.sun.javafx.scene.ParentHelper.processCSSImpl(ParentHelper.java:98)
> at com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:146)
> at javafx.scene.Node.processCSS(Node.java:9477)
> at javafx.scene.Scene.doCSSPass(Scene.java:572)
> at javafx.scene.Scene.preferredSize(Scene.java:1770)
> at javafx.scene.Scene$2.preferredSize(Scene.java:396)
> at com.sun.javafx.scene.SceneHelper.preferredSize(SceneHelper.java:66)
> at javafx.stage.Window$12.invalidated(Window.java:1163)
> at 
> javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
> at 
> javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
> at javafx.stage.Window.setShowing(Window.java:1239)
> at javafx.stage.Window.show(Window.java:1254)
> at javafx.stage.Stage.show(Stage.java:277)
> at 
> com.foo.MainLayoutController.openNewWindow(MainLayoutController.java:3851)
>
>
>
>
>
>

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