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http://jira.codehaus.org/browse/MNG-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_103055
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Tom Guyette commented on MNG-2795:
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It's not clear why this bug was closed.
We're seeing this exact issue -- checkstyle failing when a parent pom defines a
dependency on a jar that contains the configuration xml file.
We see it in Maven 2.0.5 and still in Maven 2.0.7. Works fine in Maven 2.0.4.
> Classloader problem loading a resource from a build extension Jar :
> difference between 2.0.4 and (future) 2.0.5
> ---------------------------------------------------------------------------------------------------------------
>
> Key: MNG-2795
> URL: http://jira.codehaus.org/browse/MNG-2795
> Project: Maven 2
> Issue Type: Bug
> Affects Versions: 2.0.5
> Reporter: Fabrice BELLINGARD
> Assignee: Jason van Zyl
> Fix For: 2.0.5
>
> Attachments: Checkstyle-2.0.4.txt, Checkstyle-2.0.5.txt,
> Test-BuildExtension.zip
>
>
> I had a problem when executing the Checkstyle plugin (version 2.1) with the
> pre-release of Maven 2.0.5. So I dug a bit to see if this could be related to
> maven core or not, and here is what I found.
> I isolated the code that breaks the build in the checkstyle plugin: it
> happens when the plugin tries to load my Checkstyle configuration file, which
> is actually located in a JAR that is specified in the build extensions. The
> code lies in the Locator#resolveLocation() method:
> // Attempt a Resource.
> URL url = this.getClass().getClassLoader().getResource(
> location );
> This code returns null for the "url" variable, which in turns breaks the
> plugin because it doesn't find any configuration file.
> I haven't had the time to dig more into it, but I found the following issue
> that might be related to this problem: "MNG-2228 : Classloader problem
> loading jars from build extensions". Brett and Carlos worked on it and fixed
> it, so maybe they could tell more about it.
> I attached the logs of the execution with Maven 2.0.4 (which works fine) and
> Maven 2.0.5 (which breaks). I haven't had the time yet to dig further into
> that problem.
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