我在使用最新版本的macOS（BigSur 11.0.1）和PC/SC库时遇到了问题；在更新之前，使用该库的程序可以正常工作，但更新后就无法工作了。我正在使用Java版本1.8.0_271。
在代码中，我使用方法TerminalFactory.getDefaultType()来获取终端工厂的默认类型。更新前，我收到的是“PC/SC”，但更新后我收到的是None。
如果我想强制连接到一个实例，可以使用以下命令行：
TerminalFactory factory = TerminalFactory.getInstance("PC/SC", null);
它将返回以下错误：
java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: PC/SC, provider: SunPCSC, class: sun.security.smartcardio.SunPCSC$Factory)
at java.security.Provider$Service.newInstance(Provider.java:1711)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:243)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:190)
at javax.smartcardio.TerminalFactory.getInstance(TerminalFactory.java:245)
at prueba.Prueba.isConnected(Prueba.java:165)
at prueba.Prueba.main(Prueba.java:63)
Caused by: java.lang.UnsupportedOperationException: PC/SC not available on this platform
at sun.security.smartcardio.PCSC.checkAvailable(PCSC.java:46)
at sun.security.smartcardio.SunPCSC$Factory.<init>(SunPCSC.java:59)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.security.Provider$Service.newInstance(Provider.java:1703)
... 5 more
Caused by: java.io.IOException: No PC/SC library found on this system
at sun.security.smartcardio.PlatformPCSC.getLibraryName(PlatformPCSC.java:122)
at sun.security.smartcardio.PlatformPCSC.access$000(PlatformPCSC.java:43)
at sun.security.smartcardio.PlatformPCSC$1.run(PlatformPCSC.java:64)
at sun.security.smartcardio.PlatformPCSC$1.run(PlatformPCSC.java:60)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.smartcardio.PlatformPCSC.<clinit>(PlatformPCSC.java:60)
at sun.security.smartcardio.SunPCSC$Factory.<init>(SunPCSC.java:59)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.security.Provider$Service.newInstance(Provider.java:1703)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:243)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:190)
at javax.smartcardio.TerminalFactory.getInstance(TerminalFactory.java:245)
at javax.smartcardio.TerminalFactory.<clinit>(TerminalFactory.java:106)
at prueba.Prueba.isConnected(Prueba.java:164)
... 1 more
entro isConnected--2
Exception in thread "main" java.lang.NullPointerException
at prueba.Prueba.isConnected(Prueba.java:173)
at prueba.Prueba.main(Prueba.java:63)
我发现Big Sur删除了PC / SC库，因此无法安装它。
我不知道是否有人遇到同样的错误或已经解决了这个问题。
感谢您的帮助。