尝试在cmd中查看mvn版本时出错 [英] Error when trying to see mvn version in cmd

问题描述

尝试在cmd中输入"mvn -version"时，我总是收到此错误.

I keep getting this error when trying to enter "mvn -version in the cmd.

     Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/plexus/c
     lassworlds/launcher/Launcher
     Caused by: java.lang.ClassNotFoundException: org.codehaus.plexus.classworlds.lau
     ncher.Launcher
     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
     Could not find the main class: org.codehaus.plexus.classworlds.launcher.Launcher

.程序将会退出. 'cmd'无法识别为内部或外部命令，

. Program will exit. 'cmd' is not recognized as an internal or external command,

推荐答案

这通常是M2_HOME或M3_HOME配置错误的问题.我不确定，但我想不能同时设置两者.另外，执行一个哪个mvn"-显然，某些JVM安装会在usr/bin中安装一个mvn.

This is usually a problem with misconfiguring M2_HOME or M3_HOME. I'm not sure, but I think you can't have both set. Also, do a "which mvn" - apparently some JVM installs will install a mvn in usr/bin.

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