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Maven parallel build (-T) will produce notes regarding threadsafety

See original GitHub issue

Do you want to request a feature or report a bug? Feature

What is the current behavior? Use multiple Threads and Maven 3.5.3 and the output will be:

[WARNING] *****************************************************************
[WARNING] * Your build is requesting parallel execution, but project      *
[WARNING] * contains the following plugin(s) that have goals not marked   *
[WARNING] * as @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 my-project:
[WARNING] com.github.eirslett:frontend-maven-plugin:1.6
[WARNING] Enable debug to see more precisely which goals are not marked @threadSafe.
[WARNING] *****************************************************************

If the current behavior is a bug, please provide the steps to reproduce.

What is the expected behavior? Threadsafety if possible

Please mention your frontend-maven-plugin and operating system version. Maven 3.5.3 macOS high Sierra 10.13.3