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https://jira.codehaus.org/browse/MNG-5518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=333064#comment-333064
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Anders Hammar commented on MNG-5518:
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IIRC you had to specify it in a similar fassion with the old javadoc-style
annotations as well.
Sometimes you don't want a parameter to be specifiable from command-line
because it would break some best practice, such as reproducibility for example.
> @Parameter annotation requires property element to use command-line -D
> ----------------------------------------------------------------------
>
> Key: MNG-5518
> URL: https://jira.codehaus.org/browse/MNG-5518
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Plugin API
> Affects Versions: 3.0.4, 3.1.0
> Environment: Windows 7 Pro 64 bit, JDK 1.7.0_40
> Reporter: Robert Patrick
> Attachments: annotations.zip
>
>
> When writing a plugin using the Maven Java annotations, the @Parameter
> annotation currently requires the property element to allow the goal to
> receive configuration information from the command-line using
> -DparamName=value even though the goal works fine without it when using a POM.
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