Error: Cannot invoke "javafx.scene.control.TreeItem.getValue()"

digitig · July 6, 2024, 8:39pm

Trying to work on a project and a popup keeps appearing saying:
Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null

DmitryBarashev · July 8, 2024, 11:04am

Please share the log file. Help > View log.

Carmen_Wijnberg · November 4, 2024, 4:33pm

I have the same problem, my View log says this:
C:\Users\carme\ganttproject.log

GanttProject 3.3.3311
Settings file:
location: C:\Users\carme.ganttproject
size:4995
is readable: true
java.class.path: eclipsito.jar;C:\Program Files (x86)\GanttProject-3.3;C:\Program Files (x86)\GanttProject-3.3\eclipsito.jar;C:\Program Files (x86)\GanttProject-3.3\lib\slf4j-api-2.0.4.jar;C:\Program Files (x86)\GanttProject-3.3\lib\slf4j-jdk14-2.0.4.jar
java.home: C:\Program Files (x86)\GanttProject-3.3\runtime
java.ext.dirs: null
java.io.tmpdir: C:\Users\carme\AppData\Local\Temp
java.runtime.version: 17.0.11+12-LTS
java.vendor: BellSoft
java.vm.name: OpenJDK 64-Bit Server VM
java.vm.vendor: BellSoft
java.vm.version: 17.0.11+12-LTS
os.arch: amd64
os.name: Windows 10
os.version: 10.0
sun.java.command: com.bardsoftware.eclipsito.Launch --verbosity 1 --version-dirs plugins;~/.ganttproject.d/updates --app net.sourceforge.ganttproject.GanttProject
user.country: GB
user.dir: C:\Program Files (x86)\GanttProject-3.3
user.home: C:\Users\carme
user.language: en
user.timezone: Europe/Amsterdam

[2024-11-04 15:44:04] [INFO][org.jooq.Constants]

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[2024-11-04 15:45:11] [WARN][net.sourceforge.ganttproject] Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null
java.lang.NullPointerException: Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null
at biz.ganttproject.ganttview.DragAndDropSupport.dragDetected(TaskTable.kt:1101)
at biz.ganttproject.ganttview.DragAndDropSupport.access$dragDetected(TaskTable.kt:1086)
at biz.ganttproject.ganttview.DragAndDropSupport$install$1.handle(TaskTable.kt:1092)
at biz.ganttproject.ganttview.DragAndDropSupport$install$1.handle(TaskTable.kt:1091)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.base/javafx.event.Event.fireEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$DnDGesture.fireEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$DnDGesture.process(Unknown Source)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.EmbeddedScene.lambda$mouseEvent$4(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.EmbeddedScene.lambda$mouseEvent$5(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

[2024-11-04 15:47:25] [WARN][net.sourceforge.ganttproject] Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null
java.lang.NullPointerException: Cannot invoke “javafx.scene.control.TreeItem.getValue()” because the return value of “javafx.scene.control.TreeTableRow.getTreeItem()” is null
at biz.ganttproject.ganttview.DragAndDropSupport.dragDetected(TaskTable.kt:1101)
at biz.ganttproject.ganttview.DragAndDropSupport.access$dragDetected(TaskTable.kt:1086)
at biz.ganttproject.ganttview.DragAndDropSupport$install$1.handle(TaskTable.kt:1092)
at biz.ganttproject.ganttview.DragAndDropSupport$install$1.handle(TaskTable.kt:1091)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.base/javafx.event.Event.fireEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$DnDGesture.fireEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$DnDGesture.process(Unknown Source)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Unknown Source)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.EmbeddedScene.lambda$mouseEvent$4(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at javafx.graphics/com.sun.javafx.tk.quantum.EmbeddedScene.lambda$mouseEvent$5(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

DmitryBarashev · November 5, 2024, 9:39am

Thanks for the log. It seems to be related to drag and drop in the task table. I don’t know how to reproduce the issue (please share a reproducible scenario if there is one), but it seems to be trivial to fix even without reproducing.

malcaraz · November 5, 2024, 1:46pm

Some “drag” references for some of the fixes, in Java v17.0.13 release notes
https://docs.bell-sw.com/liberica-jdk/17.0.13b12/general/release-notes/