ConcurrentModificationException when calling stage.show()

[Daniel Peintner]

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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