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http://jira.codehaus.org/browse/MNG-3284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nigel Magnay updated MNG-3284:
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Attachment: 0001-Initial-fix-to-see-if-we-can-have-1-version-of-a-pl.patch
This is my initial attempt at a fix, which seems to work for me.
The plugin coordinator and manager change to always use versioned identifiers
(rather than 'key' which doesn't include the version).
There's some mention of version not being included - but this was never an
issue (fixed already?). If there is a counterexample of where this fix won't
work, I'd be happy to work a bit further on it...
> Cached plugins are used, even when the specifically declared
> -------------------------------------------------------------
>
> Key: MNG-3284
> URL: http://jira.codehaus.org/browse/MNG-3284
> Project: Maven 2
> Issue Type: Bug
> Components: Dependencies, Plugins and Lifecycle
> Affects Versions: 2.0.7
> Reporter: Nigel Magnay
> Priority: Critical
> Attachments:
> 0001-Initial-fix-to-see-if-we-can-have-1-version-of-a-pl.patch,
> maven-bug-2.tar, pluginbug.tar
>
>
> In the attached project, you can build module A, then build module B, but the
> top level aggregator project will fail at B.
> The reason this happens is that maven seems to cache plugins. When B is built
> in isolation, all things are fine - but when built in aggregation, one of the
> plugins that it uses has already been instantiated, and so it uses that one.
> This is incorrect, since the declared version is different in B, and is
> relying on functionality not present in the version declared in A.
> I have seen similar behaviour when a plugin relies on other plugins to get
> work done - all of a sudden a build mysteriously stops working, because of a
> completely unrelated plugin.
> This is pretty painful because
> - it's possible to get into a 'no solution', where one project relies on one
> behaviour so can't upgrade, and one project relies on new behaviour, so can't
> downgrade.
> - you get builds that work OK in isolation, but not in their project. This is
> bad. Also builds tied together in bigger aggregator projects can fail in
> mysterious ways (mysterious because the user /has/ specified the plugin
> version, and maven has ignored them, or it's a plugin dependency that got
> there first)
> - subtle build ordering changes can cause new failures (the example has B
> depend on A - but the bug might only manifest itself in certain build orders
> that change even when B and A don't).
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