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http://jira.codehaus.org/browse/MNG-4668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=220263#action_220263
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Karla Jacobsen commented on MNG-4668:
-------------------------------------
Patch does not handle case sensitivity.
> Error executing from commandline on Windows (Exception in thread "main"
> java.lang.NoClassDefFoundError:
> org/codehaus/plexus/classworlds/launcher/Launcher)
> ----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MNG-4668
> URL: http://jira.codehaus.org/browse/MNG-4668
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Command Line
> Affects Versions: 3.0-beta-1
> Environment: Window XP
> Reporter: Karla Jacobsen
> Attachments: mvn_bat_exit_patch.txt, mvn_bat_noexit_patch.txt
>
>
> I get the following error when trying to execute from the commandline:
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/codehaus/plexus/classworlds/launcher/Launcher
> The problem appears when a user has multiple Maven installations and has
> previously set M2_HOME. If M2_HOME points to an installation other than the
> one currently trying to run, and the M2_HOME installation does not have the
> same classworlds jar (plexus-classworlds-*.jar versus classworlds-*.jar), the
> test cases in the .bat script will succeed, but Maven will fail.
> I've attached two possible patches because I wasn't sure what the preferred
> behavior would be. The mvn_bat_noexit_patch.txt adds a check to make sure
> that the M2_HOME directory matches up with the script's parent directory. If
> the directories do not match, it prints a warning message and continued
> executing. This assumes that either there are cases in which we may want to
> allow the batch script's directory and M2_HOME to differ, or we just want to
> give someone a helpful message if the difference breaks things.
> The second patch, mvn_bat_exit_patch.txt adds the same check and exits with
> an error message if the directories don't match. I think this is the better
> approach. It cuts down on the possibility of subtle errors down the road.
> The same changes will probably need to be made to the mvnDebug.bat.
> I did not check whether any of the other scripts need to be updated.
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