Introduce negative checks, just before each access.

[fxmisc]

Introduce negative checks, just before each access.

[Jugen]

Can you post a stacktrace please.

[newtingz]

Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89) at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306) at javafx.scene.Parent.updateCachedBounds(Parent.java:1591) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.updateTxBounds(Node.java:3641) at javafx.scene.Node.getTransformedBounds(Node.java:3424) at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) at javafx.scene.Parent.recomputeBounds(Parent.java:1524) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.updateTxBounds(Node.java:3641) at javafx.scene.Node.getTransformedBounds(Node.java:3424) at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) at javafx.scene.Parent.recomputeBounds(Parent.java:1524) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.computeLocalBounds(Node.java:3593) at javafx.scene.Node.updateLocalBounds(Node.java:3623) at javafx.scene.Node.getLocalBounds(Node.java:3484) at javafx.scene.Node.updateTxBounds(Node.java:3641) at javafx.scene.Node.getTransformedBounds(Node.java:3424) at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) at javafx.scene.Parent.updateCachedBounds(Parent.java:1596) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.updateTxBounds(Node.java:3641) at javafx.scene.Node.getTransformedBounds(Node.java:3424) at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) at javafx.scene.Parent.recomputeBounds(Parent.java:1524) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.updateTxBounds(Node.java:3641) at javafx.scene.Node.getTransformedBounds(Node.java:3424) at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) at javafx.scene.Parent.updateCachedBounds(Parent.java:1596) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.impl_intersectsBounds(Node.java:5013) at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2986) at javafx.scene.Node.impl_pickNode(Node.java:4912) at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899) at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485) at javafx.scene.Scene.pick(Scene.java:1942) at javafx.scene.Scene.access$6700(Scene.java:159) at javafx.scene.Scene$MouseHandler.process(Scene.java:3711) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:941) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:185) at java.lang.Thread.run(Unknown Source) Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89) at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306) at javafx.scene.Parent.updateCachedBounds(Parent.java:1591) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.impl_intersectsBounds(Node.java:5013) at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2986) at javafx.scene.Node.impl_pickNode(Node.java:4912) at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899) at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485) at javafx.scene.Scene.pick(Scene.java:1942) at javafx.scene.Scene.access$6700(Scene.java:159) at javafx.scene.Scene$MouseHandler.process(Scene.java:3711) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:941) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:185) at java.lang.Thread.run(Unknown Source) Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89) at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306) at javafx.scene.Parent.updateCachedBounds(Parent.java:1591) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.impl_intersectsBounds(Node.java:5013) at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2986) at javafx.scene.Node.impl_pickNode(Node.java:4912) at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899) at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485) at javafx.scene.Scene.pick(Scene.java:1942) at javafx.scene.Scene.access$6700(Scene.java:159) at javafx.scene.Scene$MouseHandler.process(Scene.java:3711) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at javafx.scene.Scene$MouseHandler$1.run(Scene.java:3521) at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:185) at java.lang.Thread.run(Unknown Source) Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89) at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306) at javafx.scene.Parent.updateCachedBounds(Parent.java:1591) at javafx.scene.Parent.recomputeBounds(Parent.java:1535) at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3133) at javafx.scene.Node.updateGeomBounds(Node.java:3577) at javafx.scene.Node.getGeomBounds(Node.java:3530) at javafx.scene.Node.getLocalBounds(Node.java:3478) at javafx.scene.Node.impl_intersectsBounds(Node.java:5013) at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2986) at javafx.scene.Node.impl_pickNode(Node.java:4912) at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899) at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485) at javafx.scene.Scene.pick(Scene.java:1942) at javafx.scene.Scene.access$6700(Scene.java:159) at javafx.scene.Scene$MouseHandler.process(Scene.java:3711) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:941) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:185) at java.lang.Thread.run(Unknown Source) Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException
And It Goes On
thanks

[Jugen]

So the difficulty is that there's no indication in the stacktrace where or why this is happening ?
The only clue we get is that it's the result of some type of MouseEvent ?
You'll need to do further research to see if you can get more information.

[newtingz]

Ok
So, I'm Usually Scrolling With The Scrollbar, very Quickly Up And Down, then it spurts that error,or most commonly it doesn't then, then when I scroll with Mouse Pad, Boom IT goes off
But,let me try to get some more info
However what about the assumed cell definitions, mentioned on the repo page,would it have any to do with?

[newtingz]

One More Thing, I think It's Related To My Heavy Cell, With images On Each Of Them, their small sizes, its a music application so when I scroll up and down, the cells tries to access the images, I'll need to implement an array blocking queue or a way to controll the images being shown

[newtingz]

Thats The Stacktrace i got from debugger

[newtingz]

[newtingz]

The main issue was, using Any other thread to update the Cell
All has to be through the JavaFX thread