Java FXML错误:应用程序启动方法中的异常 [英] Java FXML Error: Exception in Application start method

问题描述

我已经创建了一个JavaFX项目，并且在运行时出现错误，我怀疑该错误在以下 main 类之内:

I have created a JavaFX project, and have an error upon running, I suspect the error is within the following main class:

        import java.io.IOException;
    
    import javafx.application.Application;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Scene;
    import javafx.scene.layout.AnchorPane;
    import javafx.stage.Stage;
    
    public class Main extends Application {
    
       private Stage primaryStage;
       private AnchorPane mainLayout;
    
       public void start(Stage primaryStage) throws IOException {
           this.primaryStage = primaryStage;
           this.primaryStage.setTitle("Real Estate Listings");
           showMainGUI();
       }
      
       private void showMainGUI() throws IOException {
           FXMLLoader loader = new FXMLLoader();
           loader.setLocation(Main.class.getResource("C:\\Users\\micha\\Documents\\eclipse-workspace\\ProgAssignment2\\src\\MainGUI.fxml"));
           mainLayout = loader.load();
           Scene scene = new Scene(mainLayout);
           primaryStage.setScene(scene);
           primaryStage.show();
       }
    
       public static void main(String[] args) {
           launch(args);
       }
    }

这是错误:

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(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 javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    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 java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3316)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3280)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3249)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3222)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3199)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3192)
    at Main.showMainGUI(Main.java:22)
    at Main.start(Main.java:17)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    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)
    ... 1 more
Exception running application Main

通过一些研究，我发现该错误最有可能是在调用FXML加载程序的过程中造成的，但是在尝试了几种不同的修复程序之后，我无法找到一个解决方案.我是否错误地创建了FXML对象?谢谢

Upon some research, I've found the error most likely resides within the calling to the FXML loader, however after trying several different fixes I have been unable to come across a solution. Am I creating the FXML object incorrectly? Thanks

推荐答案

我想仔细看看 NullPointerException 部分，该部分在您发布的stacktrace中提到.文件路径正确吗?

I consider to have a closer look at the NullPointerException part which is mentioned inside the stacktrace you posted. Is the path to your file correct?

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