我是JavaFX的新手，正在尝试使用SceneBuilder在我已经构建的Java库存代码中实现它。我收到以下错误，但不确定如何解决。通过异常我可以理解的是它无法找到fxml文件，但是我不知道为什么会这样。这是异常输出：
Mar 15, 2020 2:34:16 AM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 11.0.1 by JavaFX runtime of version 10.0.2
button to open ADD window is clicked.
Mar 15, 2020 2:34:25 AM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 11.0.1 by JavaFX runtime of version 10.0.2
javafx.fxml.LoadException:
/C:/Users/jjjas/Desktop/my_java_work/Jeet_Simran_COMP228_Lab4/bin/AddBagel.fxml
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2603)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at application.MainController.addBagel(MainController.java:27)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1782)
at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8865)
at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3876)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1300(Scene.java:3604)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1874)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2613)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.NullPointerException
at application.BagelController.initialize(BagelController.java:122)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
... 61 more
FXML文件：AddBagel.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.CheckBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.text.Font?>
<AnchorPane prefHeight="332.0" prefWidth="367.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/11.0.1" fx:controller="application.BagelController">
<children>
<Label alignment="CENTER" prefHeight="88.0" prefWidth="367.0" style="-fx-background-color: RED;" text="ADD BAGEL NAME TO BE ADDED IN THE INVENTORY" textFill="#f5f3f3">
<font>
<Font name="Segoe Script Bold" size="14.0" />
</font>
</Label>
<HBox layoutX="25.0" layoutY="88.0" prefHeight="59.0" prefWidth="332.0" spacing="95.0">
<padding>
<Insets top="30.0" />
</padding>
<children>
<CheckBox fx:id="cinnamonCheckBox" mnemonicParsing="false" prefHeight="29.0" prefWidth="121.0" text="Cinnamon" textFill="#f72929">
<font>
<Font name="Segoe Script Bold" size="15.0" />
</font>
</CheckBox>
<CheckBox fx:id="natureCheckBox" layoutX="10.0" layoutY="40.0" mnemonicParsing="false" prefHeight="29.0" prefWidth="92.0" text="Nature" textFill="#f72929">
<font>
<Font name="Segoe Script Bold" size="15.0" />
</font>
</CheckBox>
</children>
</HBox>
<HBox layoutX="25.0" layoutY="145.0" prefHeight="59.0" prefWidth="332.0" spacing="100.0">
<padding>
<Insets top="30.0" />
</padding>
<children>
<CheckBox fx:id="blueberryCheckBox" mnemonicParsing="false" prefHeight="27.0" prefWidth="117.0" text="Blueberry" textFill="#f72929">
<font>
<Font name="Segoe Script Bold" size="15.0" />
</font>
</CheckBox>
<CheckBox fx:id="cinnamonCheckBox11" layoutX="10.0" layoutY="40.0" mnemonicParsing="false" prefHeight="29.0" prefWidth="92.0" text="Nature" textFill="#f72929">
<font>
<Font name="Segoe Script Bold" size="15.0" />
</font>
</CheckBox>
</children>
</HBox>
<HBox layoutX="27.0" layoutY="217.0" prefHeight="59.0" prefWidth="313.0" spacing="80.0">
<padding>
<Insets left="20.0" right="20.0" top="10.0" />
</padding>
<children>
<Button mnemonicParsing="false" onAction="#bagelNameToBeAdded" prefHeight="40.0" prefWidth="130.0" style="-fx-background-color: yellow;" text="SAVE" textFill="#ee2525">
<font>
<Font name="Segoe Script Bold" size="13.0" />
</font>
</Button>
<Button layoutX="30.0" layoutY="20.0" mnemonicParsing="false" onAction="#bagelNameToBeAdded" prefHeight="40.0" prefWidth="130.0" style="-fx-background-color: yellow;" text="CANCEL" textFill="#ee2525">
<font>
<Font name="Segoe Script Bold" size="13.0" />
</font>
</Button>
</children>
</HBox>
<Label layoutX="47.0" layoutY="285.0" prefHeight="29.0" prefWidth="272.0" textFill="#f02222">
<font>
<Font name="Segoe Script Bold" size="13.0" />
</font>
</Label>
</children>
</AnchorPane>
主类：
package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
primaryStage.setTitle("TIM HORTONS");
String fxmlFileName = "../MainWindow.fxml";
Parent root = FXMLLoader.load(getClass().getResource(fxmlFileName));
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
主控制器类：
package application;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import ex2_database.Inventory;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class MainController implements Initializable{
Inventory inventory = new Inventory();
@FXML
private void addBagel(ActionEvent event) {
System.out.println("button to open ADD window is clicked.");
try {
Stage stage = new Stage();
String fxmlFileName = "../AddBagel.fxml";
FXMLLoader loader = new FXMLLoader(getClass().getResource(fxmlFileName));
Parent root = loader.load();
Scene scene = new Scene(root);
stage.setScene(scene);
BagelController bagelController = loader.<BagelController>getController();
bagelController.populateBagel(inventory);
stage.show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void initialize(URL location, ResourceBundle resources) {
}
}