java - 为什么会出现“应用程序启动方法 java.lang.reflect.InvocationTargetException 中的异常”？
问题描述
我正在尝试创建一个 javafx 项目，但我总是得到“应用程序启动方法 java.lang.reflect.InvocationTargetException 中的异常”我尝试了一切，但没有任何帮助。起初 fxml 文件与 java 文件不在同一个包中，但在将其放入同一个包后，问题仍然存在。这是我的代码：
package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Lotto extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("LottoNezet.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setResizable(false);
stage.setTitle("Lott program");
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
这是整个例外
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: javafx.fxml.LoadException:
/C:/Users/gerg/eclipse-workspace/FXXMLProjekt/bin/application/LottoNezet.fxml:12
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.access$700(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml/javafx.fxml.FXMLLoader.load(Unknown Source)
at application.Lotto.start(Lotto.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
... 1 more
Caused by: java.lang.ClassNotFoundException: lotto.LottoNezetController
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
... 23 more
Exception running application application.Lotto
这是 fxml 文件：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.shape.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="300.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="lotto.LottoNezetController">
<children>
<Pane id="basePane" fx:id="basePane" prefHeight="306.0" prefWidth="400.0">
<children>
<Rectangle arcHeight="5.0" arcWidth="5.0" fill="#ebfffd" height="315.0" stroke="BLACK" strokeType="INSIDE" width="410.0" />
<Text layoutX="94.0" layoutY="69.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Írj be 5 számot 1 és 90 között!">
<font>
<Font name="Calibri Light" size="18.0" />
</font></Text>
<Text layoutX="161.0" layoutY="43.0" strokeType="OUTSIDE" strokeWidth="0.0" text="LOTTÓ">
<font>
<Font name="BATAVIA" size="25.0" />
</font>
</Text>
<Button fx:id="button" layoutX="152.0" layoutY="264.0" onAction="#handleButtonAction" text="Sorsolás!" textFill="#8d0000">
<font>
<Font size="19.0" />
</font></Button>
<HBox layoutX="37.0" layoutY="74.0" spacing="40.0">
<children>
<TextField id="input1" fx:id="input1" layoutX="73.0" layoutY="75.0" prefHeight="25.0" prefWidth="34.0" />
<TextField id="input2" fx:id="input2" layoutX="125.0" layoutY="75.0" prefHeight="25.0" prefWidth="34.0" />
<TextField id="input4" fx:id="input4" layoutX="182.0" layoutY="75.0" prefHeight="25.0" prefWidth="34.0" />
<TextField id="input3" fx:id="input3" layoutX="234.0" layoutY="75.0" prefHeight="25.0" prefWidth="34.0" />
<TextField id="input5" fx:id="input5" layoutX="293.0" layoutY="75.0" prefHeight="25.0" prefWidth="34.0" />
</children>
<padding>
<Insets bottom="1.0" left="1.0" right="1.0" top="1.0" />
</padding>
</HBox>
<HBox layoutX="48.0" layoutY="163.0" spacing="60.0">
<children>
<Label id="label1" fx:id="label1" graphicTextGap="5.0" layoutX="36.0" layoutY="129.0" />
<Label id="label2" fx:id="label2" layoutX="88.0" layoutY="129.0" />
<Label id="label3" fx:id="label3" layoutX="145.0" layoutY="129.0" />
<Label id="label4" fx:id="label4" layoutX="197.0" layoutY="129.0" />
<Label id="label5" fx:id="label5" layoutX="256.0" layoutY="129.0" />
</children>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</HBox>
<Label id="resultLabel" fx:id="resultLabel" alignment="CENTER" contentDisplay="CENTER" layoutX="70.0" layoutY="215.0" prefHeight="27.0" prefWidth="260.0" textAlignment="CENTER" textFill="#fc0000" textOverrun="CENTER_WORD_ELLIPSIS" wrapText="true">
<font>
<Font size="14.0" />
</font></Label>
<Text layoutX="100.0" layoutY="147.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Sorsolt számok:" textAlignment="CENTER" wrappingWidth="200.0">
<font>
<Font name="Calibri" size="19.0" />
</font>
</Text>
</children>
</Pane>
<Pane id="alertPane" fx:id="alertPane" prefHeight="306.0" prefWidth="400.0" visible="false" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<Rectangle arcHeight="50.0" arcWidth="50.0" fill="#cae5ff" height="123.0" layoutX="100.0" layoutY="100.0" stroke="BLACK" strokeType="INSIDE" width="200.0" />
<Label id="alertText" fx:id="alertText" alignment="CENTER" contentDisplay="CENTER" layoutX="96.0" layoutY="110.0" prefHeight="76.0" prefWidth="209.0" textAlignment="CENTER" wrapText="true" />
<Button id="alertButton" fx:id="alertButton" layoutX="184.0" layoutY="186.0" mnemonicParsing="false" onAction="#handleAlertButton" text="OK" />
</children>
</Pane>
</children>
</AnchorPane>
解决方案
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