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https://jira.codehaus.org/browse/MNG-5628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=345906#comment-345906
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Jason van Zyl commented on MNG-5628:
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Some of the graph handling code was changed, but it's very hard to reproduce
without a sample project as Michael says.
> NullPointerException with Maven 3.2.1 when circular dependency exists in POMs
> -----------------------------------------------------------------------------
>
> Key: MNG-5628
> URL: https://jira.codehaus.org/browse/MNG-5628
> Project: Maven 2 & 3
> Issue Type: Bug
> Affects Versions: 3.2.1
> Environment: Windows 7, Cygwin
> Reporter: Ray Suliteanu
> Attachments: mvn-3.2.1-exception.txt
>
>
> I had introduced a circular dependency in my multi-project POM configuration
> without realizing it. With 3.2.1 I got an NPE. See attached file. Switching
> to 3.1.1 gave me the appropriate error about the circular dependency.
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