mvn -v 報 java.lang.NoClassDefFoundError異常

安裝完成之後，運行mvn -v指令，發現出現異常。

Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/classworlds/Launcher Caused by: java.lang.ClassNotFoundException: org.codehaus.classworlds.Launcher         at java.net.URLClassLoader$1.run(Unknown Source)         at java.security.AccessController.doPrivileged(Native Method)         at java.net.URLClassLoader.findClass(Unknown Source)         at java.lang.ClassLoader.loadClass(Unknown Source)         at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)         at java.lang.ClassLoader.loadClass(Unknown Source)         at java.lang.ClassLoader.loadClassInternal(Unknown Source) Could not find the main class: org.codehaus.classworlds.Launcher.  Program will exit.

出錯原因:

  我環境變數裡 M2_HOME  = d:\maven3

Path中設定 d:\maven2\bin

將Path中改為%M2_HOME%\BIN\

解決問題!