JAVA运行时报错Unable to make protected void java.awt.EventQueue.dispatchEvent

Question

我将matlab程序打包成了一个jar包，想要在JAVA中调用，一开始可以正常运行
我想在Jframe中运行它，因此我将运行它的代码放在了构造方法内，一直报错

java.lang.reflect.InaccessibleObjectException: Unable to make protected void java.awt.EventQueue.dispatchEvent(java.awt.AWTEvent) accessible: module java.desktop does not "opens java.awt" to unnamed module @37574691
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
    at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
    at com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities$1.run(MCRThreadUtilities.java:76)
    at com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities$1.run(MCRThreadUtilities.java:71)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
    at com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities.<clinit>(MCRThreadUtilities.java:70)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR$4.invoke(MWMCR.java:835)
    at jdk.proxy1/jdk.proxy1.$Proxy0.mclInitializeComponentInstance(Unknown Source)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.newInstance(MWMCR.java:646)
    at forJava2.ForJava2MCRFactory.newInstance(ForJava2MCRFactory.java:44)
    at forJava2.ForJava2MCRFactory.newInstance(ForJava2MCRFactory.java:55)
    at forJava2.forJava.<init>(forJava.java:63)
    at utils.Matlab.Tri(Matlab.java:15)
    at demo.tttt$1.mouseClicked(tttt.java:45)
    at java.desktop/java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:278)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6629)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3389)
    at java.desktop/java.awt.Component.processEvent(Component.java:6391)
    at java.desktop/java.awt.Container.processEvent(Container.java:2266)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5001)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4584)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:746)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:744)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:743)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Exception in thread "AWT-EventQueue-0": java.lang.reflect.UndeclaredThrowableException
    at jdk.proxy1/jdk.proxy1.$Proxy0.mclInitializeComponentInstance(Unknown Source)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.newInstance(MWMCR.java:646)
    at forJava2.ForJava2MCRFactory.newInstance(ForJava2MCRFactory.java:44)
    at forJava2.ForJava2MCRFactory.newInstance(ForJava2MCRFactory.java:55)
    at forJava2.forJava.<init>(forJava.java:63)
    at utils.Matlab.Tri(Matlab.java:15)
    at demo.tttt$1.mouseClicked(tttt.java:45)
    at java.desktop/java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:278)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6629)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3389)
    at java.desktop/java.awt.Component.processEvent(Component.java:6391)
    at java.desktop/java.awt.Container.processEvent(Container.java:2266)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5001)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4584)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:746)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:744)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:743)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.lang.IllegalAccessException: class com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities cannot access class sun.awt.AWTAutoShutdown (in module java.desktop) because module java.desktop does not export sun.awt to unnamed module @37574691
    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.Method.invoke(Method.java:560)
    at com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities.runBackgroundTask(MCRThreadUtilities.java:227)
    at com.mathworks.toolbox.javabuilder.internal.MCRThreadUtilities.runWhilePumpingEventQueue(MCRThreadUtilities.java:52)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR$4.invoke(MWMCR.java:835)

后来我发现，如果我将

        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    aaa frame = new aaa();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

中的

aaa frame = new aaa();
frame.setVisible(true);

放到外面，就可以运行了，但是我想将运行matlab代码的那串代码放在鼠标监听器里，又会继续报上面的错误

Answer 1

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这个问题看起来是由于Java的安全机制导致的，特别是在涉及到Java的AWT和Java的模块化系统时。当你尝试在Java中调用MATLAB的代码时，似乎MATLAB的代码尝试访问某些Java的内部类（在这种情况下是sun.awt.AWTAutoShutdown），但由于安全限制，它无法这样做。这就是为什么你在构造函数内运行代码没有问题，但在监听器内运行相同的代码却引发错误的原因。

解决这个问题的一种可能的方法是尝试绕过Java的安全机制，但这通常不推荐，因为它可能会导致未定义的行为和其他潜在问题。然而，在这种情况下，你可以尝试以下解决方案：

1. 修改Java的模块化系统配置：你可以尝试修改Java的模块化系统配置来允许MATLAB的代码访问所需的内部类。这可能涉及到编辑Java的模块信息文件（module-info.java）或JVM启动参数来更改模块访问权限。但是，这种方法可能需要对Java和模块化系统的深入了解。
2. 将MATLAB代码移到外部进程：考虑到在JFrame中运行MATLAB代码引发了问题，你可以考虑将MATLAB代码作为一个独立的进程运行，并通过Java程序与其进行通信。这样，MATLAB代码不会直接尝试访问Java的内部类，从而避免了这个问题。你可以使用进程间通信（IPC）机制（如Socket通信）来实现Java和MATLAB之间的数据交换。

另外，你的代码中存在一个可能的逻辑问题。你提到在构造方法中运行代码没有问题，但在鼠标监听器中运行会引发错误。如果aaa frame = new aaa(); frame.setVisible(true);这段代码是在构造方法中执行的，那么当构造方法执行完毕并返回后，JFrame对象已经被创建并显示。如果你在鼠标监听器中再次尝试创建和显示JFrame对象，这看起来是不必要的，因为JFrame已经在应用程序启动时创建和显示了。你应该确保你的代码中不会出现重复创建和显示同一个JFrame对象的逻辑错误。

希望这些信息能对你有所帮助！如果你有更多关于这个问题的细节或需要进一步的帮助，请随时向我询问。