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https://issues.apache.org/jira/browse/MJAR-140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17957223#comment-17957223
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Matthias Bünger commented on MJAR-140:
--------------------------------------
This project has moved from Jira to GitHub Issues. This issue was migrated to
[apache/maven-jar-plugin#309|https://github.com/apache/maven-jar-plugin/issues/309].
> Performance degredation
> ------------------------
>
> Key: MJAR-140
> URL: https://issues.apache.org/jira/browse/MJAR-140
> Project: Maven JAR Plugin (Moved to GitHub Issues)
> Issue Type: Bug
> Affects Versions: 2.3, 2.3.1
> Reporter: Eran Harel
> Assignee: Kristian Rosenvold
> Priority: Major
> Fix For: 2.3.2
>
>
> I migrated maven to version 3.0.1 in order to utilize the parallel build
> experimental feature.
> As a result I get the following warning:
> {code}
> [WARNING] *****************************************************************
> [WARNING] * Your build is requesting parallel execution, but project *
> [WARNING] * contains the following plugin(s) that are not marked as *
> [WARNING] * @threadSafe to support parallel building. *
> [WARNING] * While this /may/ work fine, please look for plugin updates *
> [WARNING] * and/or request plugins be made thread-safe. *
> [WARNING] * If reporting an issue, report it against the plugin in *
> [WARNING] * question, not against maven-core *
> [WARNING] *****************************************************************
> [WARNING] The following plugins are not marked @threadSafe in DataBuilder:
> [WARNING] org.apache.maven.plugins:maven-eclipse-plugin:2.8
> [WARNING] org.apache.maven.plugins:maven-jar-plugin:2.2
> [WARNING] *****************************************************************
> {code}
> I upgraded the maven-jar-plugin to the latest version (2.3.1), and the
> message is gone, but now the builds take much longer: minutes added!!!
> The build takes about x 1.5 longer now.
> I also compared the maven 3 parallel build time with the new jar-plugin VS a
> serial build with the old 2.2 plugin version I had. The results are that
> same, while when using the parallel build with the 2.2 plugin I see a
> significant ~30% performance boost.
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