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IndexOutOfBoundsException when updating ListView in JavaFX

I am having a problem with an IndexOutOfBoundsException exception while I want to update a ListView in JavaFX.

What do I need to do

I have a ListView with items that correspond to a small simulation. By clicking on a single list item, the graphic modeling update is based on a click on the ListView element. Subsequently, the ListView needs to be updated and other items will be shown. This means that all old items will be deleted and only new ones will be shown.

My code looks like this:

public void init() { // simCont.initSimulation() returns ArrayList ObservableList<Default> obsDefaultList = FXCollections .observableArrayList(simCont.initSimulation()); listTest.getItems().addAll(obsDefaultList); listTest.getSelectionModel().selectedItemProperty() .addListener(new ChangeListener<Default>() { @Override public void changed( ObservableValue<? extends Default> observable, Default oldValue, Default newValue) { updateList(newValue); } }); } private void updateList(Default chosen) { ObservableList<Default> list = FXCollections .observableArrayList(simCont.doSimulationStep(chosen.getId())); listTest.getItems().clear(); listTest.getItems().addAll(list); }

Two items are displayed first. When I click on one of them, it updates the ListView, but I get an IndexOutOfBoundsException.

 Exception in thread "JavaFX Application Thread" java.lang.IndexOutOfBoundsException at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.subList(ReadOnlyUnbackedObservableList.java:136) at javafx.collections.ListChangeListener$Change.getAddedSubList(ListChangeListener.java:242) at com.sun.javafx.scene.control.behavior.ListViewBehavior.lambda$new$174(ListViewBehavior.java:258) at com.sun.javafx.scene.control.behavior.ListViewBehavior$$Lambda$145/442103778.onChanged(Unknown Source) at javafx.collections.WeakListChangeListener.onChanged(WeakListChangeListener.java:88) at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329) at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73) at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.callObservers(ReadOnlyUnbackedObservableList.java:75) at javafx.scene.control.MultipleSelectionModelBase.clearAndSelect(MultipleSelectionModelBase.java:331) at com.sun.javafx.scene.control.behavior.CellBehaviorBase.simpleSelect(CellBehaviorBase.java:242) at com.sun.javafx.scene.control.behavior.CellBehaviorBase.doSelect(CellBehaviorBase.java:206) at com.sun.javafx.scene.control.behavior.CellBehaviorBase.mousePressed(CellBehaviorBase.java:132) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:95) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Scene$MouseHandler.process(Scene.java:3724) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382) at com.sun.glass.ui.View.handleMouseEvent(View.java:553) at com.sun.glass.ui.View.notifyMouse(View.java:925) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102) at com.sun.glass.ui.win.WinApplication$$Lambda$37/1109371569.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Exception in thread "JavaFX Application Thread" java.lang.IndexOutOfBoundsException: Index: 3, Size: 3 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at de.hhn.unitylab.controller.SimulationController.doSimulationStep(SimulationController.java:65) at de.hhn.unitylab.ui.SimulatorViewController.updateList(SimulatorViewController.java:107) at de.hhn.unitylab.ui.SimulatorViewController.access$0(SimulatorViewController.java:105) at de.hhn.unitylab.ui.SimulatorViewController$1.changed(SimulatorViewController.java:94) at de.hhn.unitylab.ui.SimulatorViewController$1.changed(SimulatorViewController.java:1) at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182) at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) at javafx.beans.property.ReadOnlyObjectWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyObjectWrapper.java:176) at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:142) at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112) at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145) at javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:102) at javafx.scene.control.MultipleSelectionModelBase.lambda$new$34(MultipleSelectionModelBase.java:67) at javafx.scene.control.MultipleSelectionModelBase$$Lambda$127/2138925075.invalidated(Unknown Source) at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137) at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) at javafx.beans.property.ReadOnlyIntegerWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:176) at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:142) at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113) at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:146) at javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68) at javafx.scene.control.MultipleSelectionModelBase.select(MultipleSelectionModelBase.java:357) at javafx.scene.control.ListView.lambda$new$156(ListView.java:374) at javafx.scene.control.ListView$$Lambda$126/1092624378.invalidated(Unknown Source) at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349) at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) at javafx.beans.property.ReadOnlyBooleanPropertyBase.fireValueChangedEvent(ReadOnlyBooleanPropertyBase.java:72) at javafx.scene.Node$FocusedProperty.notifyListeners(Node.java:7526) at javafx.scene.Scene$13.invalidated(Scene.java:2046) at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111) at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145) at javafx.scene.Scene$KeyHandler.setFocusOwner(Scene.java:3891) at javafx.scene.Scene$KeyHandler.requestFocus(Scene.java:3938) at javafx.scene.Scene$KeyHandler.access$1900(Scene.java:3877) at javafx.scene.Scene.requestFocus(Scene.java:2010) at javafx.scene.Node.requestFocus(Node.java:7687) at com.sun.javafx.scene.control.behavior.ListViewBehavior.mousePressed(ListViewBehavior.java:360) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:95) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Scene$MouseHandler.process(Scene.java:3724) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382) at com.sun.glass.ui.View.handleMouseEvent(View.java:553) at com.sun.glass.ui.View.notifyMouse(View.java:925) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102) at com.sun.glass.ui.win.WinApplication$$Lambda$37/1109371569.run(Unknown Source) at java.lang.Thread.run(Thread.java:745)

Debugging was confusing because I did not find a reason for the exception. I searched on the Internet but found nothing for me. Hope someone can help me on this.

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4 answers

A bit late, but since you're still getting exceptions, here are my two cents. I was getting the same error and this is what worked for me.

You cannot update user interface elements from a non-main thread. One way to do this is to make Runnable and schedule it in the main runLater thread.

 Platform.runLater(new Runnable() { @Override public void run() { //put your code here }});
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Put the observed list outside the method (just like a normal field)

 ObservableList<Default> listData = FXCollections.observableArrayList() public void initialize(Url url, ResourceBundle rb) { listData.addAll(myService.getFoo); listTest.setItems(listData); //You could use lambdas here if you use Java8 listTest.getSelectionModel.selectedItemProperty() .addListener(new ChangeListener<Default>(){ @Override public void changed(ObservableValue<? extends Default> observable, Default oldValue, Default newValue) { //Update the graphical simulations somewhere here listData.clear(); listData.add(new Default(..)); //Add new values to list } }); }

If you bind a list to observable objects in a list, the table changes whenever the observable list (here listData ). What you did wrong each time creates a new observable list.

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I had exactly the same problem when using ComboBox and trying to update observablelist support.

I fixed it by changing ComboBox to ChoiceBox , and now I no longer get IndexOutOfBoundsException .

Have you tried using other containers?

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I think you are in a similar situation to this answer: JavaFX ComboBox change value throws IndexOutOfBoundsException

try

 Platform.runLater(() -> updateList(newValue) )

instead of updateList(newValue)

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Source: https://habr.com/ru/post/1204575/

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