安装maven出现错误：Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/_maven打包找不到main,exception in thread "main-优快云博客

本文链接：https://blog.youkuaiyun.com/lalade2008/article/details/51534757

本文介绍了在Mac上安装Maven时遇到的一个常见错误——UnsupportedMajor.MinorVersion错误，并提供了具体的解决方案，即通过设置正确的JAVA_HOME环境变量来指定所需的Java版本。

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按照官网步骤安装maven出现错误：
localhost:~ wuna$ mvn -version
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
   at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
   at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
   at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
   at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
   at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
   at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
   at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:254)
   at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
   at org.codehaus.plexus.classworlds.launcher.Launcher.getMainClass(Launcher.java:144)
   at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:266)
   at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
   at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

根本原因：Java环境导致，我的mac上装了1.7、1.6

将JAVA_HOME加入环境变量，解决问题，如下：

JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
export JAVA_HOME