Maven (mvn) Exception in thread "main" java. lang. NoClassDefFoundError

It could happen when you try to run mvn or if will just check its version it will give you this kind of error (Exception):


MBPro-2:~ apple$ mvn -version
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/plexus/classworlds/launcher/Launcher
Caused by: java.lang.ClassNotFoundException: org.codehaus.plexus.classworlds.launcher.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)

In this case you need just fix symlink to the right version of Maven on your Mac OSX: carefully read and follow all instructions of this article.