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http://jira.codehaus.org/browse/MNG-4577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=212354#action_212354
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Benjamin Bentmann commented on MNG-4577:
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bq. If the Windows batch does the same with M2_HOME
Yup, it does.
> support side by side installations of different maven versions
> --------------------------------------------------------------
>
> Key: MNG-4577
> URL: http://jira.codehaus.org/browse/MNG-4577
> Project: Maven 2 & 3
> Issue Type: Improvement
> Components: Bootstrap & Build, Command Line
> Affects Versions: 2.0.11, 2.2.1, 3.0-alpha-6
> Environment: Windows XP / Vista / 7
> Reporter: Jörg Buchberger
>
> If you like existing users to adopt new versions of Maven faster and if you
> like to gain new users of Maven from the paranoid type of build dudes...
> then I suggest you allow different versions of Maven to be installed and used
> in parallel.
> For example one might have the latest stable release installed, but likes to
> give the latest beta from another a branch a shot. I.e. you want to be able
> to do your work as usual on top of the stable release, while building
> something on top of a beta/branch version of Maven at the same time. This
> does not work (at least on Windows) - in fact, Maven won't even startup or
> emit version info anymore, if two or more versions of Maven are installed in
> parallel.
> Another decent example is this:
> Have the latest stable release around and ready for your work on a daily
> basis, while at the same time keeping around an ancient version of Maven for
> some complicated legacy projects in maintenance mode. This is useful, if
> project management does not allow to invest time into migrating build
> configuration and subsequent testing of its results.
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