JavaFX – Application start方法中的exception？

我正在尝试创建一个JavaFX程序，每次我尝试运行我的代码时都会遇到exception – 我不完全确定它的意思是什么……

我的代码：

package application; import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.stage.Stage; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.layout.BorderPane; public class Main extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("DogFinderFXML.fxml")); Scene scene = new Scene(root); stage.setScene(scene); stage.setTitle("HelloSwingNode Sample"); stage.show(); } /** * @param args the command line arguments */ public static void main(String[] args) { launch(args); } } 

堆栈跟踪：

 Exception in Application start method java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source) at com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source) Caused by: java.lang.RuntimeException: Exception in Application start method at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(Unknown Source) at com.sun.javafx.application.LauncherImpl$$Lambda$48/1732398722.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException: Location is required. at javafx.fxml.FXMLLoader.loadImpl(Unknown Source) at javafx.fxml.FXMLLoader.loadImpl(Unknown Source) at javafx.fxml.FXMLLoader.loadImpl(Unknown Source) at javafx.fxml.FXMLLoader.loadImpl(Unknown Source) at javafx.fxml.FXMLLoader.loadImpl(Unknown Source) at javafx.fxml.FXMLLoader.load(Unknown Source) at application.Main.start(Main.java:14) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(Unknown Source) at com.sun.javafx.application.LauncherImpl$$Lambda$51/1778973910.run(Unknown Source) at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(Unknown Source) at com.sun.javafx.application.PlatformImpl$$Lambda$44/1051754451.run(Unknown Source) at com.sun.javafx.application.PlatformImpl.lambda$null$164(Unknown Source) at com.sun.javafx.application.PlatformImpl$$Lambda$47/813155481.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(Unknown Source) at com.sun.javafx.application.PlatformImpl$$Lambda$46/1775282465.run(Unknown Source) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$141(Unknown Source) at com.sun.glass.ui.win.WinApplication$$Lambda$37/1109371569.run(Unknown Source) ... 1 more Exception running application application.Main 

任何帮助将不胜感激，

谢谢

Answer 1

一个简单的修复：将fxml文件复制到main方法当前所在的包中。 保存并重新运行。