Performance degredation
------------------------
Key: MJAR-140
URL: http://jira.codehaus.org/browse/MJAR-140
Project: Maven 2.x Jar Plugin
Issue Type: Bug
Affects Versions: 2.3.1
Reporter: Eran Harel
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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