[WARNING] *****************************************************************
[WARNING] * Your build is requesting parallel execution, but this *
[WARNING] * project contains the following plugin(s) that have goals not *
[WARNING] * marked as thread-safe to support parallel execution. *
[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 Apache Maven. *
[WARNING] *****************************************************************
[WARNING] The following plugins are not marked as thread-safe in Eclipse SWTChart:
[WARNING] org.eclipse.cbi.maven.plugins:eclipse-jarsigner-plugin:1.3.2
[WARNING]
[WARNING] Enable debug to see precisely which goals are not marked as thread-safe.
[WARNING] *****************************************************************
This partly reverts https://github.com/eclipse/swtchart/pull/301 but keeping it for the pull request builds. It seems that parallel Maven is still not ready for prime time. It prints a large warning on https://ci.eclipse.org/swtchart/job/build/job/develop/3056/console