无法构造javafx.application.Application实例
我正在尝试Oracle网站上的JavaFX教程[fxml tutorial]（ http://docs.oracle.com/javase/8/javafx/get-started-tutorial/fxml_tutorial.htm ）。
package fxml; import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage; class Main extends Application { public Main() {} @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("welcome.fxml")); Scene scene = new Scene(root); stage.setTitle("FXML UI"); stage.setScene(scene); stage.show(); } public static void main(String args[]) { launch(args); } } 这是我不断得到的例外。 应用程序未显示在屏幕上。 我从另一个堆栈溢出答案做了非args Main（）构造函数，但它没有解决它。
Exception in Application constructor Exception in thread "main" java.lang.RuntimeException: Unable to construct Application instance: class fxml.Main at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:884) at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56) at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.IllegalAccessException: Class com.sun.javafx.application.LauncherImpl$7 can not access a member of class fxml.Main with modifiers "public" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:101) at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:295) at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:287) at java.lang.reflect.Constructor.newInstance(Constructor.java:398) at com.sun.javafx.application.LauncherImpl$7.run(LauncherImpl.java:791) at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335) at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301) at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
class Main extends Application缺少初始的public关键字。
public Main() {}也是不必要的。