異常JavaFX中刷新與所選項目的組合框時（的InvocationTargetException）

我有我用繩子異常JavaFX中刷新與所選項目的組合框時（的InvocationTargetException）

ObservableList<String> list = FXCollections.observableArrayList(); 

for (String port : ports){ 
    list.add(port); 
} 

comboBoxSelectPort.setItems(list);

列表initalize組合框然後，我從ComboBox中選擇一個項目，做一些動作，最後希望用空列表刷新組合框。

ObservableList<String> list = FXCollections.observableArrayList(); 
comboBoxSelectPort.setItems(list);

但是每次想要刷新ComboBox時，都會出現以下錯誤。也許問題是我刷新時選擇了一些項目？

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774) 
     at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) 
     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) 
     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:49) 
     at javafx.event.Event.fireEvent(Event.java:198) 
     at javafx.scene.Node.fireEvent(Node.java:8411) 
     at com.sun.javafx.scene.control.skin.ComboBoxListViewSkin.handleControlPropertyChanged(ComboBoxListViewSkin.java:179) 
     at com.sun.javafx.scene.control.skin.BehaviorSkinBase.lambda$registerChangeListener$61(BehaviorSkinBase.java:197) 
     at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55) 
     at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89) 
     at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361) 
     at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) 
     at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105) 
     at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112) 
     at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146) 
     at javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:150) 
     at javafx.scene.control.ComboBox.updateValue(ComboBox.java:463) 
     at javafx.scene.control.ComboBox.access$200(ComboBox.java:192) 
     at javafx.scene.control.ComboBox$3.changed(ComboBox.java:446) 
     at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:361) 
     at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) 
     at javafx.beans.property.ReadOnlyObjectWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyObjectWrapper.java:176) 
     at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:142) 
     at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112) 
     at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146) 
     at javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:102) 
     at javafx.scene.control.ComboBox$ComboBoxSelectionModel.lambda$new$154(ComboBox.java:494) 
     at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137) 
     at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) 
     at javafx.beans.property.ReadOnlyIntegerWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:176) 
     at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:142) 
     at javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:113) 
     at javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:147) 
     at javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:68) 
     at javafx.scene.control.ComboBox$ComboBoxSelectionModel.updateItemsObserver(ComboBox.java:578) 
     at javafx.scene.control.ComboBox$ComboBoxSelectionModel.access$400(ComboBox.java:482) 
     at javafx.scene.control.ComboBox$ComboBoxSelectionModel$1.invalidated(ComboBox.java:511) 
     at javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83) 
     at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:349) 
     at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81) 
     at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105) 
     at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112) 
     at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146) 
     at javafx.scene.control.ComboBox.setItems(ComboBox.java:286) 
     at de.control.GrblSender.setPorts(GrblSender.java:90) 
     at de.control.Controller.handleButtonDisconnect(Controller.java:397) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:497) 
     at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) 
     at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:497) 
     at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) 
     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769) 
     at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) 
     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) 
     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:49) 
     at javafx.event.Event.fireEvent(Event.java:198) 
     at javafx.scene.Node.fireEvent(Node.java:8411) 
     at javafx.scene.control.Button.fire(Button.java:185) 
     at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182) 
     at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96) 
     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$MouseHandler.process(Scene.java:3757) 
     at javafx.scene.Scene$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$MouseEventNotification.run(GlassViewEventHandler.java:352) 
     at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388) 
     at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
     at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387) 
     at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
     at com.sun.glass.ui.View.notifyMouse(View.java:937) 
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
     at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
     at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.reflect.InvocationTargetException 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:497) 
     at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) 
     at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:497) 
     at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) 
     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769) 
     ... 119 more 
Caused by: java.lang.NullPointerException 
     at de.control.Controller.handleComboBoxSelectPort(Controller.java:68) 
     ... 129 more

來源

2016-04-08 Luke

是否有原因，你想做一個新的清單，而不是清理舊的？ ObservableList有一個刪除方法你會做 'list.remove（0，list.size（））;' – dustinroepsch

沒有理由。我改變了它，但顯然對異常沒有影響。 – Luke

您在Controller類的第68行有一個NullPointerException。 – ItachiUchiha

從控制器類

@FXML 
public void handleComboBoxSelectPort(ActionEvent event) { 

    String selectedPort = comboBoxSelectPort.getValue(); 
    imageViewPreloader.setStyle("-fx-opacity: 1"); 

    if(!selectedPort.isEmpty()) {       // LINE 68 
     try { grblSender.openPort(selectedPort); } 
     catch(Exception e){} 
    } 
}

我換成線68

if(selectedPort != null && !selectedPort.isEmpty()) {

其防止NullPointerException異常和解決我的問題！

來源

2016-04-08 20:00:10 Luke

異常JavaFX中刷新與所選項目的組合框時（的InvocationTargetException）

回答

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