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https://jira.codehaus.org/browse/MJAVADOC-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=346026#comment-346026
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Herve Boutemy commented on MJAVADOC-171:
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more information on forked lifecycles added in MSHARED-333, to help diagnose
problems
> Modules in multi-module projects are "built" too often
> ------------------------------------------------------
>
> Key: MJAVADOC-171
> URL: https://jira.codehaus.org/browse/MJAVADOC-171
> Project: Maven Javadoc Plugin
> Issue Type: Bug
> Affects Versions: 2.3
> Environment: Maven 2.0.8, Linux
> Reporter: Stefan Seidel
> Attachments: 2.2.log, 2.3.log, mjavadoc-171-b.zip, mjavadoc171.patch,
> mjavadoc-171.zip, mvnexec.zip
>
>
> In a multi-module project, all modules are "built" twice for each module.
> This leads to huge performance problems when many modules are in a project.
> In the attached sample project, the xmlbeans plugin is executed 27 times for
> a project with one parent module and two submodules. 18 of these executions
> can be attributed to the javadoc plugin. With version 2.2, only 3 invocations
> (once for each project) are caused by the javadoc plugin.
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