错误消息：
Error: A JNI error has occurred, please check your installation and try again
Exception in thread “main” java.lang.UnsupportedClassVersionError: JavaVersionChecker has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader 1. r u n ( U n k n o w n S o u r c e ) a t j a v a . s e c u r i t y . A c c e s s C o n t r o l l e r . d o P r i v i l e g e d ( N a t i v e M e t h o d ) a t j a v a . n e t . U R L C l a s s L o a d e r . f i n d C l a s s ( U n k n o w n S o u r c e ) a t j a v a . l a n g . C l a s s L o a d e r . l o a d C l a s s ( U n k n o w n S o u r c e ) a t s u n . m i s c . L a u n c h e r 1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher 1.run(UnknownSource)atjava.security.AccessController.doPrivileged(NativeMethod)atjava.net.URLClassLoader.findClass(UnknownSource)atjava.lang.ClassLoader.loadClass(UnknownSource)atsun.misc.LauncherAppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
执行javac -version和java -version，发现返回的版本结果不一样：
在环境变量设置里把指向jdk 11的设置删除，问题即解决。
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