"About JabRef" results in exception

[AEgit]

JabRef 5.3--2021-01-04--10180ed
Windows 10 10.0 amd64
Java 14.0.2

Using Help -> About JabRef results in an exception. Note, that this does not happen the first time you click on About JabRef. But the second time you attempt you click on About JabRef (and every consecutive attempt) results in an exception. The following error message appears:

Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]

The exception stacktrace is:

java.lang.IllegalStateException: Cannot set owner once stage has been set visible
	at org.jabref.merged.module@5.3.28/javafx.stage.Stage.initOwner(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.control.HeavyweightDialog.initOwner(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.control.Dialog.initOwner(Unknown Source)
	at org.jabref@5.3.28/org.jabref.gui.JabRefDialogService.showCustomDialog(Unknown Source)
	at org.jabref@5.3.28/org.jabref.gui.help.AboutAction.execute(Unknown Source)
	at org.jabref@5.3.28/org.jabref.gui.actions.JabRefAction.lambda$new$3(Unknown Source)
	at org.jabref.merged.module@5.3.28/org.controlsfx.control.action.Action.handle(Unknown Source)
	at org.jabref.merged.module@5.3.28/org.controlsfx.control.action.Action.handle(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.control.MenuItem.fire(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.scene.control.ContextMenuContent$MenuItemContainer.doSelect(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.scene.control.ContextMenuContent$MenuItemContainer.lambda$createChildren$12(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.Scene$MouseHandler.process(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.Scene.processMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.glass.ui.View.notifyMouse(Unknown Source)
	at org.jabref.merged.module@5.3.28/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at org.jabref.merged.module@5.3.28/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

Only by closing JabRef and re-opening it you can get rid of the error message and associated exception. But again, this is only the case for the first time you click on About JabRef. The second time the exception will appear again.

[Siedlerchr]

We now also have the weird behaviour that you can open some dialogs multiple times

[AEgit]

Note, that this bug must have been introduced in the last 18 days or so. I tried an earlier developer version 18 days ago (see #5522 (comment)), where I did not encounter this bug (at least I do not remember having seen it).

[koppor]

Should work again in the latest build (appearing in ca. 10 minutes)

[AEgit]

JabRef 5.3--2021-01-04--eca13dd
Windows 10 10.0 amd64
Java 14.0.2

I can confirm this has been fixed in the current developer version. Well done!