我有一个JavaFX应用程序，其中用户按下一个按钮，该按钮将加载新的fxml。这很好。但是，当我在第二个fxml上创建另一个按钮以将用户带到第三个fxml时，在控制台中得到以下输出。很抱歉在下面放置这么多代码，我不知道什么是重要的还是不重要的。有任何想法吗？它说有一个空指针，但是我知道productionSlider.fxml的文件路径是正确的。感谢您的帮助。
Jan 13, 2019 4:15:52 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 10.0.1 by JavaFX runtime of version 8.0.191
Jan 13, 2019 4:15:55 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 10.0.1 by JavaFX runtime of version 8.0.191
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.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.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$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 45 more
Caused by: java.lang.NullPointerException: Location is required.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at application.comfortControl.loadProductivity(comfortControl.java:26)
... 55 more
package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
// Load FXML file
Parent root = FXMLLoader.load(getClass().getResource("HumansightFirstDraft.fxml"));
// Create scene
Scene scene = new Scene(root, 400, 600);
//Load CSS
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
// Display application
primaryStage.setScene(scene);
primaryStage.setResizable(false);
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.effect.Blend?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane fx:id="rootPane" prefHeight="600.0" prefWidth="400.0" stylesheets="@application.css" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.HumansightFirstDraftControl">
<children>
<Button fx:id="startSurvey" layoutX="135.0" layoutY="500.0" mnemonicParsing="false" onAction="#loadComfort" prefHeight="50.0" prefWidth="130.0" text="Daily Survey" textFill="WHITE">
<font>
<Font name="Oxygen" size="18.0" />
</font>
<effect>
<Blend />
</effect>
</Button>
<Label alignment="CENTER" focusTraversable="false" layoutX="60.0" layoutY="320.0" mouseTransparent="true" prefHeight="200.0" prefWidth="300.0" text="text1" wrapText="true">
<font>
<Font name="Oxygen" size="18.0" />
</font>
</Label>
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.effect.Blend?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane maxHeight="600.0" maxWidth="400.0" minHeight="600.0" minWidth="400.0" prefHeight="600" prefWidth="400" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.comfortControl">
<children>
<Label layoutX="70.0" layoutY="377.0" text="text2">
<font>
<Font name="Oxygen" size="18.0" />
</font>
</Label>
<ImageView fitHeight="61.0" fitWidth="346.0" layoutX="32.0" layoutY="415.0" pickOnBounds="true" preserveRatio="true" style="-fx-scale-y: 1.4;">
<image>
<Image url="@../../bin/application/sliderColors.png" />
</image>
</ImageView>
<Slider fx:id="comfortSlider" layoutX="36.0" layoutY="424.0" prefHeight="39.0" prefWidth="329.0">
<effect>
<Blend />
</effect>
</Slider>
<Button fx:id="toProductivity" layoutX="135.0" layoutY="500.0" mnemonicParsing="false" onAction="#loadProductivity" prefHeight="50.0" prefWidth="130.0" stylesheets="@application.css" text="Next" textFill="WHITE">
<font>
<Font name="Oxygen" size="18.0" />
</font>
</Button>
</children>
</AnchorPane>
package application;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;
public class HumansightFirstDraftControl implements Initializable{
@FXML
private AnchorPane rootPane;
@Override
public void initialize(URL location, ResourceBundle resources) {
// TODO Auto-generated method stub
}
@FXML
private void loadComfort(ActionEvent event) throws IOException {
AnchorPane pane = FXMLLoader.load(getClass().getResource("/application/comfortSlider.fxml"));
rootPane.getChildren().setAll(pane);
}
}
package application;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;
public class comfortControl implements Initializable{
@FXML
private AnchorPane rootPane;
@Override
public void initialize(URL location, ResourceBundle resources) {
// TODO Auto-generated method stub
}
@FXML
private void loadProductivity(ActionEvent event) throws IOException {
AnchorPane pane = FXMLLoader.load(getClass().getResource("/application/productivitySlider.fxml"));
rootPane.getChildren().setAll(pane);
}
}
答案 0 :(得分：0)
对我来说，这是一个愚蠢的错误，但是我会在某个人像我一样愚蠢的偶然情况下发布我的解决方案。我要做的就是将fx：id和anchorPane名称更改为每个更特定的名称。我都命名了anchorPanes rootPanes，所以都很时髦。