dragging files and folders on entry generates exception

[ilippert]

JabRef 5.2--2020-11-03--b5bcea4
Linux 5.8.17-200.fc32.x86_64 amd64
Java 15.0.1

Upon dragging a pdf (without write file permissions) on an entry, I got this exception.

Log File

java.lang.NullPointerException: Cannot read field "dragboard" because "this.this$0.dndGesture" is null
  at org.jabref.merged.module@5.2.214/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.214/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.2.214/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

[ilippert]

JabRef 5.2--2020-11-05--09f8098
Linux 5.8.18-200.fc32.x86_64 amd64
Java 15.0.1

another log case for the same error - but without read-only file.

Log File

java.lang.NullPointerException: Cannot read field "dragboard" because "this.this$0.dndGesture" is null
  at org.jabref.merged.module@5.2.224/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

[ilippert]

Exception, but file was attached.

Log File

java.lang.NullPointerException: Cannot read field "dragboard" because "this.this$0.dndGesture" is null
  at org.jabref.merged.module@5.2.224/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.2.224/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

[ilippert]

Same happens regularly (error, but file gets attached) - just documenting the errors, in case that is helpful.

JabRef 5.2--2020-11-17--a335f0d
Linux 5.9.8-200.fc33.x86_64 amd64
Java 15.0.1

Log File

java.lang.NullPointerException: Cannot read field "dragboard" because "this.this$0.dndGesture" is null
  at org.jabref.merged.module@5.2.264/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.2.264/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.2.264/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

[Siedlerchr]

It's always the same error, so no need to report it everytime, but I fear it's somehow related to javafx. I am not sure if we can do anything about this atm.
Coul you please give some more information about your GUI toolkit? KDE? GTK? Gnome?
There was a similar thing in OSX which got fixed in the latest javafx application.

[ilippert]

Ok, thanks a lot.
This is gnome, Fedora 33, Wayland.

[ilippert]

It is still the same issue
JabRef 5.3--2021-01-07--129abaa
Linux 5.9.16-200.fc33.x86_64 amd64
Java 15.0.1

[Siedlerchr]

Can you please try again with the latest version? I updated the javafx version

[ilippert]

Hi,
at
JabRef 5.3--2021-01-09--86852c6
Linux 5.9.16-200.fc33.x86_64 amd64
Java 15.0.1
JavaFX 15.0.1+1

I do not get any reaction - no error message but neither is a pdf attached.

[ilippert]

Hi,

at
JabRef 5.3--2021-02-03--242a494
Linux 5.10.11-200.fc33.x86_64 amd64
Java 15.0.2
JavaFX 15.0.1+1
I get

Log File

java.lang.NullPointerException: Cannot read field "dragboard" because "this.this$0.dndGesture" is null
  at org.jabref.merged.module@5.3.115/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.115/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.3.115/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

and the pdf does not get attached.

[ilippert]

See also https://gitlab.gnome.org/GNOME/nautilus/-/issues/1745

[ilippert]

Hi,

at
JabRef 5.3--2021-03-19--049acb9
Linux 5.11.7-200.fc33.x86_64 amd64
Java 15.0.2
JavaFX 16+8
I get

Log File

  at org.jabref.merged.module@5.3.203/javafx.scene.Scene$DropTargetListener.drop(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragDrop$2(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragDrop$11(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.glass.ui.View.handleDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.glass.ui.View.notifyDragDrop(Unknown Source)
  at org.jabref.merged.module@5.3.203/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
  at org.jabref.merged.module@5.3.203/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(Unknown Source)
  at java.base/java.lang.Thread.run(Unknown Source)

and the pdf does get attached when I drag and drop onto the File field of an entry/in entry editor.

[Siedlerchr]

@ilippert damn, I hoped that the bug was fixed with jfx16 :/
Did you press any modifier key? Can you try with shift/ctrl/alt... And the exception from the log seems to be missing some lines wich state the cause, but that seems like the same as in your other post