您好我试图在我的项目中实现jfxtras icalendaragenda但是当我编辑约会并保存或删除此约会时，我得到了一个NPE。有人知道为什么会这样吗？我看过一些视频教程，这个错误不应该发生。
感谢。
以下是代码：
package graphicInterface;
import java.net.URL;
import java.time.LocalDateTime;
import java.time.Period;
import java.util.ResourceBundle;
import com.jfoenix.controls.JFXButton;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.layout.BorderPane;
import jfxtras.internal.scene.control.skin.agenda.AgendaDaySkin;
import jfxtras.internal.scene.control.skin.agenda.AgendaWeekSkin;
import jfxtras.labs.icalendaragenda.scene.control.agenda.ICalendarAgenda;
import jfxtras.labs.icalendarfx.VCalendar;
public class ControllerAgendaPatients implements Initializable{
@FXML
private BorderPane container;
@FXML
private JFXButton pWeek;
@FXML
private JFXButton nWeek;
@FXML
private JFXButton day;
@FXML
private JFXButton week;
@FXML
private JFXButton month;
private ICalendarAgenda agenda;
private void createAgenda() {
VCalendar vcalendar = new VCalendar();
agenda = new ICalendarAgenda(vcalendar);
container.setCenter(agenda);
}
@FXML
void onClickDayView(ActionEvent event) {
this.agenda.setSkin(new AgendaDaySkin(agenda));
}
@FXML
void onClickMonthView(ActionEvent event) {
}
@FXML
void onClickWeekView(ActionEvent event) {
this.agenda.setSkin(new AgendaWeekSkin(agenda));
}
@FXML
void onNextWeekClick(ActionEvent event) {
LocalDateTime ldt = agenda.getDisplayedLocalDateTime().plus(Period.ofWeeks(1));
agenda.setDisplayedLocalDateTime(ldt);
}
@FXML
void onPreviousWeekClick(ActionEvent event) {
LocalDateTime ldt = agenda.getDisplayedLocalDateTime().minus(Period.ofWeeks(1));
agenda.setDisplayedLocalDateTime(ldt);
}
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
this.createAgenda();
}
}
以下是例外：
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:8413)
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$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 52 more
Caused by: java.lang.NullPointerException
at jfxtras.labs.icalendaragenda.internal.scene.control.skin.agenda.base24hour.editors.EditDisplayableTabPane.removeEmptyProperties(EditDisplayableTabPane.java:76)
at jfxtras.labs.icalendaragenda.internal.scene.control.skin.agenda.base24hour.editors.EditLocatableTabPane.removeEmptyProperties(EditLocatableTabPane.java:64)
at jfxtras.labs.icalendaragenda.internal.scene.control.skin.agenda.base24hour.editors.EditDisplayableTabPane.handleSaveButton(EditDisplayableTabPane.java:68)
at jfxtras.labs.icalendaragenda.internal.scene.control.skin.agenda.base24hour.editors.EditLocatableTabPane.handleSaveButton(EditLocatableTabPane.java:35)
... 62 more