java -jar test.jar
执行jar时遇到的问题如下：
Error: A JNI error has occurred, please check your installation and try againException in thread "main" java.lang.UnsupportedClassVersionError: com/xx/xx/App 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 52.0at java.lang.ClassLoader.defineClass1(Native Method)at java.lang.ClassLoader.defineClass(ClassLoader.java:756)at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)at .URLClassLoader.defineClass(URLClassLoader.java:473)at .URLClassLoader.access$100(URLClassLoader.java:74)at .URLClassLoader$1.run(URLClassLoader.java:369)at .URLClassLoader$1.run(URLClassLoader.java:363)at java.security.AccessController.doPrivileged(Native Method)at .URLClassLoader.findClass(URLClassLoader.java:362)at java.lang.ClassLoader.loadClass(ClassLoader.java:418)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)at java.lang.ClassLoader.loadClass(ClassLoader.java:351)at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)
处理办法：
1：下载jdk11,
2：使用 ‘zh/jdk11/jdk-11/bin/java’ -jar test.jar 执行
