java - 未加载 FXML 文件
问题描述
所以，我有一个 FXML 文件BookView_FXML.fxml和一个控制器BookView. show()FXML 文件在控制器类内的方法中加载。当我运行应用程序时，我得到一个fxml.LoadException.
这是错误报告：
javafx.fxml.LoadException:
/C:/path_to_package/memberApp/BookView_FXML.fxml:7
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:941)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:980)
at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:227)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:752)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
at memberApp.BookView.display(BookView.java:58)
at memberApp.HomeScreenController.lambda$initializeTableView$1(HomeScreenController.java:181)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3564)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.access$8200(Scene.java:3492)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3860)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1200(Scene.java:3579)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
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$2(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.InstantiationException: memberApp.BookView
at java.base/java.lang.Class.newInstance(Class.java:571)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:936)
... 44 more
Caused by: java.lang.NoSuchMethodException: memberApp.BookView.<init>()
at java.base/java.lang.Class.getConstructor0(Class.java:3349)
at java.base/java.lang.Class.newInstance(Class.java:556)
... 45 more
BookView班级_
package memberApp;
// excluded the import statements
public class BookView implements Initializable
{
public AnchorPane root ;
public Label bookIDLbl, titleLbl, authorLbl, isbnLbl, publisherLbl, categoryLbl, copiesAvailableLbl ;
public VBox vbox ;
private final Book theBook ;
private String bookID, title, author, isbn, publisher, category, copiesAvailable ;
public BookView(Book book)
{
this.theBook = book ;
}
@Override
public void initialize(URL url, ResourceBundle resourceBundle)
{
initializeData();
initializeLabels() ;
}
public void display()
{
Stage primary_stage = new Stage() ;
primary_stage.initModality(Modality.APPLICATION_MODAL) ; // the initModality specifies that the stage will block events
primary_stage.setTitle("BOOK INFO") ;
try {
Parent root = FXMLLoader.load(Objects.requireNonNull(getClass().getResource("BookView_FXML.fxml"))) ;
Scene scene = new Scene(root) ;
primary_stage.setScene(scene) ;
primary_stage.show() ;
}
catch (Exception e){
System.out.println("\nExceptions in BookView.display() -> " + e) ;
e.printStackTrace() ;
}
}
private void initializeData()
{
bookID = theBook.getBookID() ;
title = theBook.getTitle() ;
author = theBook.getAuthor() ;
isbn = theBook.getIsbn() ;
publisher = theBook.getPublisher() ;
category = theBook.getCategory() ;
copiesAvailable = theBook.getTotalCopies() ;
}
private void initializeLabels()
{
bookIDLbl.setText("BookID: " + bookID) ;
titleLbl.setText(title) ;
authorLbl.setText("BY " + author) ;
isbnLbl.setText("ISBN: " + isbn) ;
publisherLbl.setText("Publisher: " + publisher) ;
categoryLbl.setText("Category: " + category) ;
copiesAvailableLbl.setText("Copies Available: " + copiesAvailable) ;
}
}
FXML 文件：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>
<AnchorPane fx:id="root" minHeight="-Infinity" minWidth="-Infinity" prefHeight="450.0" prefWidth="650.0" xmlns="http://javafx.com/javafx/16" xmlns:fx="http://javafx.com/fxml/1" fx:controller="memberApp.BookView">
<Label fx:id="titleLbl" alignment="CENTER" minHeight="-Infinity" minWidth="-Infinity" prefHeight="50.0" text="<title goes here>" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<font>
<Font size="20.0" />
</font>
</Label>
<Label fx:id="authorLbl" alignment="CENTER" layoutX="10.0" layoutY="10.0" minHeight="-Infinity" minWidth="-Infinity" prefHeight="30.0" text="<author's name goes here>" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="50.0">
<font>
<Font size="15.0" />
</font>
</Label>
<VBox fx:id="vbox" alignment="CENTER" layoutX="250.0" layoutY="100.0" prefHeight="200.0" prefWidth="100.0" spacing="10.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="100.0">
<Label fx:id="bookIDLbl" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="150.0" text="Label">
<font>
<Font size="13.5" />
</font>
</Label>
<Label fx:id="isbnLbl" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="150.0" text="Label">
<font>
<Font size="13.5" />
</font>
</Label>
<Label fx:id="categoryLbl" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="150.0" text="Label">
<font>
<Font size="13.5" />
</font>
</Label>
<Label fx:id="publisherLbl" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="150.0" text="Label">
<font>
<Font size="13.5" />
</font>
</Label>
<Label fx:id="copiesAvailableLbl" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="150.0" text="Label">
<font>
<Font size="13.5" />
</font>
</Label>
</VBox>
</AnchorPane>
我不确定是什么导致了异常。任何帮助是极大的赞赏。
解决方案
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