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https://jira.codehaus.org/browse/MJAVADOC-171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=276619#comment-276619
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Stefan Seidel commented on MJAVADOC-171:
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Oh, and the "Maven 3" part of the pom.xml only is there to show that with Maven
3 and the maven-site-plugin:3.0 the problem is the same (even though only
versions 2.7 and 2.8 of maven-javadoc-plugin run sucessfully under Maven 3 +
maven-site-plugin 3.0).
> Modules in multi-module projects are "built" too often
> ------------------------------------------------------
>
> Key: MJAVADOC-171
> URL: https://jira.codehaus.org/browse/MJAVADOC-171
> Project: Maven 2.x Javadoc Plugin
> Issue Type: Bug
> Affects Versions: 2.3
> Environment: Maven 2.0.8, Linux
> Reporter: Stefan Seidel
> Assignee: Herve Boutemy
> Priority: Critical
> Fix For: 2.8
>
> Attachments: 2.2.log, 2.3.log, 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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