我有一个带有可观察列表的组合框，该列表会随着用户输入字符或进行选择而更新。我遇到的问题是当我从 ComboBox 中选择一个项目并调用侦听器事件，然后调用 ComboBox 的 ObservableList 中的clear() 方法时引起的。
完整代码
public void suggestItem(ActionEvent ev){
String currentInput = foodSearch.getEditor().getText();
if(currentInput.length() > 4){
DatabaseCommunicator.openConnection();
// Returns a list no greater than size 5 of possible food items
ArrayList<String> foodList = DatabaseCommunicator.findSimilarFoods(currentInput);
ObservableList<String> comboList = foodSearch.getItems();
comboList.setAll(foodList);
DatabaseCommunicator.closeConnection();
}
}
现在，当我收到错误时，ObservableList 按其应有的方式显示，但我仍然收到此异常。尝试调试此问题导致我的 IDE 在调用运行clear() 的 setAll 后冻结，我不得不通过终端终止 IDE。
如果我用不清除（）的 addAll 替换 setAll ，我不会抛出任何异常，并且我的列表会更新并重新添加单击的项目。
我无法在侦听器中捕获异常，我希望看到堆栈跟踪，但无论如何都想尝试一下。
这是堆栈跟踪。
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$178(ListViewBehavior.java:264)
at com.sun.javafx.scene.control.behavior.ListViewBehavior$$Lambda$321/1588822558.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 javafx.scene.control.ListView$ListViewBitSetSelectionModel.clearAndSelect(ListView.java:1385)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.simpleSelect(CellBehaviorBase.java:260)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.doSelect(CellBehaviorBase.java:224)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.mousePressed(CellBehaviorBase.java:150)
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:3719)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3447)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1723)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2456)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$347(GlassViewEventHandler.java:385)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$169/414422402.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:387)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
at com.sun.glass.ui.View.handleMouseEvent(View.java:549)
at com.sun.glass.ui.View.notifyMouse(View.java:921)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139)
at com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/1091223379.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
这有点像黑客，但是
Platform.runLater(() -> {
ObservableList<String> comboList = foodSearch.getItems();
comboList.setAll(foodList);
}
似乎可以修复它。我认为问题在于您正在修改列表，而选择模型正在更改selectedItemslist，这违反了在通知期间不更改可观察列表的规则。使用Platform.runLater(...)延迟您的修改，直到当前事件完全处理之后。
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)
