Different problems when (trying) to open a library

[JulianReitz]

Windows 10, JabRef 5.2

When I open a .bib file in windows explorer, jabref opens but does not open the bib file.

When I open jabref and try to drag and drop the bib file to the jabref GUI, I get error messages in the moment I move with the cursor to the GUI (not only when I try to drop the bib file but allready when I move over the GUI).
The error messages is at the end of this post.

The only way for me to open a bib file is to open jabref and use 'File -> Open Library'

Begin of error message:

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

java.lang.ClassCastException: class javafx.scene.control.Tab cannot be cast to class org.jabref.gui.LibraryTab (javafx.scene.control.Tab is in module org.jabref.merged.module@5.2.60000 of loader 'app'; org.jabref.gui.LibraryTab is in module org.jabref@5.2.60000 of loader 'app')
at org.jabref@5.2.60000/org.jabref.gui.JabRefFrame.lambda$init$8(Unknown Source)
at com.tobiasdiez.easybind@2.1.0/com.tobiasdiez.easybind.MappedList$1.getRemoved(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ListChangeListener$Change.getRemovedSize(Unknown Source)
at com.tobiasdiez.easybind@2.1.0/com.tobiasdiez.easybind.ListContentBinding.onChanged(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ObservableListBase.fireChange(Unknown Source)
at com.tobiasdiez.easybind@2.1.0/com.tobiasdiez.easybind.MappedList.sourceChanged(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.transformation.TransformationList.lambda$getListener$0(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.WeakListChangeListener.onChanged(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ObservableListBase.fireChange(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ListChangeBuilder.commit(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ListChangeBuilder.endChange(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ObservableListBase.endChange(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ModifiableObservableListBase.remove(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.collections.ModifiableObservableListBase.remove(Unknown Source)
at org.jabref@5.2.60000/org.jabref.gui.JabRefFrame.lambda$initDragAndDrop$2(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.event.Event.fireEvent(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.Scene$DnDGesture.handleExitEnter(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.Scene$DnDGesture.processTargetExit(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.Scene$DropTargetListener.dragExit(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragLeave$1(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragLeave(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragLeave$10(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragLeave(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.View.handleDragLeave(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.View.notifyDragLeave(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.Application.enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.EventLoop.enter(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.stage.Stage.showAndWait(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.control.HeavyweightDialog.showAndWait(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.control.Dialog.showAndWait(Unknown Source)
at org.jabref@5.2.60000/org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(Unknown Source)
at org.jabref@5.2.60000/org.jabref.gui.FallbackExceptionHandler.lambda$uncaughtException$0(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.Application.enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.EventLoop.enter(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.stage.Stage.showAndWait(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.control.HeavyweightDialog.showAndWait(Unknown Source)
at org.jabref.merged.module@5.2.60000/javafx.scene.control.Dialog.showAndWait(Unknown Source)
at org.jabref@5.2.60000/org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(Unknown Source)
at org.jabref@5.2.60000/org.jabref.gui.FallbackExceptionHandler.lambda$uncaughtException$0(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at org.jabref.merged.module@5.2.60000/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

[Siedlerchr]

Thank you for reporting this issue. We think, that is already fixed in our development version and consequently the change will be included in the next release.

We would like to ask you to use a development build from https://builds.jabref.org/main and report back if it works for you. Please remember to make a backup of your library before trying-out this version.

[JulianReitz]

Thank you for the fast response and for sending the development build. With this version, I no longer get an error when doing drag and drop, but I still can't open a bib file from the explorer using doubleclick or rightclick -> open / open with. Am Do., 8. Apr. 2021 um 13:02 Uhr schrieb Christoph < ***@***.***>:

…

Closed #7614 <#7614>. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#7614 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJKGJVM5Y2WDISELIAQBVFTTHWENJANCNFSM42SUST3Q> .

[MartinX3]

Dear @Siedlerchr updating form 5.4 to 5.5 and saving the "JabRef preferences" resulted in

java.lang.ClassCastException: class javafx.scene.control.Tab cannot be cast to class org.jabref.gui.LibraryTab (javafx.scene.control.Tab is in module org.jabref.merged.module@5.5.39 of loader 'app'; org.jabref.gui.LibraryTab is in module org.jabref@5.5.39 of loader 'app')
	at org.jabref@5.5.39/org.jabref.gui.JabRefFrame.lambda$setupAllTables$23(Unknown Source)
	at java.base/java.lang.Iterable.forEach(Unknown Source)
	at org.jabref@5.5.39/org.jabref.gui.JabRefFrame.setupAllTables(Unknown Source)
	at org.jabref@5.5.39/org.jabref.gui.preferences.PreferencesDialogViewModel.storeAllSettings(Unknown Source)
	at org.jabref@5.5.39/org.jabref.gui.preferences.PreferencesDialogView.savePreferencesAndCloseDialog(Unknown Source)
	at org.jabref@5.5.39/org.jabref.gui.preferences.PreferencesDialogView.lambda$new$0(Unknown Source)
	at org.jabref@5.5.39/org.jabref.gui.util.ControlHelper.lambda$setAction$0(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventHandler$NormalEventFilterRecord.handleCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventHandler.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventDispatcher.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.scene.Node.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.scene.control.Button.fire(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.scene.control.inputmap.InputMap.handle(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.scene.Scene$MouseHandler.process(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.scene.Scene.processMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.glass.ui.View.notifyMouse(Unknown Source)
	at org.jabref.merged.module@5.5.39/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at org.jabref.merged.module@5.5.39/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

Resetting the preferences, which resulted in heavy application errors forcing me to force kill the process, fixed this issue if no file is loaded.
But the issue comes back after I opened my *.bib file and try to update the preferences.

[Siedlerchr]

Thanks for the issue report. This is odd. However, I think this should be easily fixable
Refs #7470

[MartinX3]

You're welcome
Drag-And-Drop is the only way for me to load my file. If I load it with the context menu, I also get this error.
And if I get this error once, I also can't close the application anymore without getting this error.

[MartinX3]

Also happens with newer code

java.lang.ClassCastException: class javafx.scene.control.Tab cannot be cast to class org.jabref.gui.LibraryTab (javafx.scene.control.Tab is in module org.jabref.merged.module@5.6.5 of loader 'app'; org.jabref.gui.LibraryTab is in module org.jabref@5.6.5 of loader 'app')
	at org.jabref@5.6.5/org.jabref.gui.JabRefFrame.lambda$setupAllTables$23(Unknown Source)
	at java.base/java.lang.Iterable.forEach(Unknown Source)
	at org.jabref@5.6.5/org.jabref.gui.JabRefFrame.setupAllTables(Unknown Source)
	at org.jabref@5.6.5/org.jabref.gui.preferences.PreferencesDialogViewModel.storeAllSettings(Unknown Source)
	at org.jabref@5.6.5/org.jabref.gui.preferences.PreferencesDialogView.savePreferencesAndCloseDialog(Unknown Source)
	at org.jabref@5.6.5/org.jabref.gui.preferences.PreferencesDialogView.lambda$new$0(Unknown Source)
	at org.jabref@5.6.5/org.jabref.gui.util.ControlHelper.lambda$setAction$0(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventHandler$NormalEventFilterRecord.handleCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventHandler.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventDispatcher.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.scene.Node.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.scene.control.Button.fire(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.scene.control.inputmap.InputMap.handle(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.scene.Scene$MouseHandler.process(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.scene.Scene.processMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.glass.ui.View.notifyMouse(Unknown Source)
	at org.jabref.merged.module@5.6.5/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at org.jabref.merged.module@5.6.5/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

[Siedlerchr]

@MartinX3 Can you test the newest 5.6. snapshot from here ?https://builds.jabref.org/main/ should be hopefully fixed now

[MartinX3]

@Siedlerchr tested with todays build
Same result

java.lang.ClassCastException: class javafx.scene.control.Tab cannot be cast to class org.jabref.gui.LibraryTab (javafx.scene.control.Tab is in module org.jabref.merged.module@5.6.14 of loader 'app'; org.jabref.gui.LibraryTab is in module org.jabref@5.6.14 of loader 'app')
	at org.jabref@5.6.14/org.jabref.gui.JabRefFrame.lambda$getLibraryTabs$8(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
	at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
	at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
	at java.base/java.util.stream.ReferencePipeline.collect(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.JabRefFrame.getLibraryTabs(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.preferences.PreferencesDialogViewModel.updateAfterPreferenceChanges(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.preferences.PreferencesDialogViewModel.storeAllSettings(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.preferences.PreferencesDialogView.savePreferencesAndCloseDialog(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.preferences.PreferencesDialogView.lambda$new$0(Unknown Source)
	at org.jabref@5.6.14/org.jabref.gui.util.ControlHelper.lambda$setAction$0(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventHandler$NormalEventFilterRecord.handleCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventHandler.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventDispatcher.dispatchCapturingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.scene.Node.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.scene.control.Button.fire(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.scene.control.inputmap.InputMap.handle(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.event.Event.fireEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.scene.Scene$MouseHandler.process(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.scene.Scene.processMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.glass.ui.View.notifyMouse(Unknown Source)
	at org.jabref.merged.module@5.6.14/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at org.jabref.merged.module@5.6.14/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)