JavaFX模块javafx.graphics [英] JavaFX module javafx.graphics

问题描述

在解决robot.awt的一个必需问题之后，我现在在运行我的应用程序时遇到了另一个问题.应用程序构建没有问题.堆栈跟踪:

Upon fixing a requires issue with robot.awt I've now encountered another problem upon running my application. Application builds with no issues. Stack trace :

Exception in Application constructor
Exception in thread "main" 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:566)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class reports.Main
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:890)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class reports.Main (in module Reports) because module Reports does not export reports to module javafx.graphics
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:591)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:802)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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

Process finished with exit code 1

推荐答案

此问题的根本原因包含在以下行中:

The root cause for the issue is contained in this line:

Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class reports.Main (in module Reports) because module Reports does not export reports to module javafx.graphics

Application.launch使用反射使用反射创建应用程序类的实例.如果外部类位于打开或导出到Application的模块(javafx.graphics)的程序包中，则仅允许外部类(例如Application)通过反射访问您的类.

Application.launch uses reflection to create a instance of the application class using reflection. External classes like Application are only allowed to access your classes via reflections if the class recides in a package that is opened or exported to Application's module (javafx.graphics).

您需要在Reports模块声明中添加以下行之一:

You need to add one of the following lines your Reports module declaration:

exports reports;
opens reports to javafx.graphics;

最后一行应该是首选，因为它是限制性更强的一行.如果除非reports软件包中还包含例如main类/方法，您应该使用第一行.

The last line should be preferred since it's the more restrictive one. If the unless the reports package also contains e.g. a main class/method, you should use the first line.

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