今天在调试 JavaFX 时发现报错：

Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:901)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: javafx.fxml.LoadException: 
/home/loac/Project/JavaFX/******/target/classes/cc/loac/******/home-view.fxml:16
	at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2714)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:944)
	at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:981)
	at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:230)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:755)
	at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2845)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2641)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2555)
	at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2523)
	at cc.loac.civilaviationmanagersystem/cc.loac.civilaviationmanagersystem.HelloApplication.start(HelloApplication.kt:18)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:847)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
	at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
	at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:290)
	... 1 more
Caused by: java.lang.IllegalAccessException: class javafx.fxml.FXMLLoader$ValueElement (in module javafx.fxml) cannot access class cc.loac.civilaviationmanagersystem.controller.HomeController (in module cc.loac.civilaviationmanagersystem) because module cc.loac.civilaviationmanagersystem does not export cc.loac.civilaviationmanagersystem.controller to module javafx.fxml
	at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392)
	at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:489)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:939)
	... 17 more

我是创建了一个新的 FXML 文件和一个对应的 Controller 类并在 FXML 中指定了 fx:controller 后报错。

下面是我的文件结构图：

解决方法

在 module-info.java 文件中加入下行：

// 具体情况具体分析，我这里指定的是我的 Controller 类所在的包地址
opens cc.loac.civilaviationmanagersystem.controller to javafx.fxml;