Maven error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher

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I hit this problem too, and found this article. For Maven3, changing my environment variable name from M2_HOME to M3_HOME did the trick. I am on a Mac running OSX 10.9 with JDK 1.7. Hope this helps.

Note: Please delete M2_HOME, if already set. Eg: unset M2_HOME

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