Thread-safe warning when executing maven parallel build

Question

I am running Maven parallel build. I am gettting some warning.

[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 my-project:
[WARNING] org.apache.maven.plugins:maven-clean-plugin:2.1.1
[WARNING] org.codehaus.mojo:cobertura-maven-plugin:2.2
[WARNING] ****************************************************************

The build is success. Can some one tell me which version of the following plugins will be threadsafe.

Can I simply ignore this.

Answer 1

org.apache.maven.plugins:maven-clean-plugin:2.5 and org.codehaus.mojo:cobertura-maven-plugin:2.5.2 are both threadsafe (from https://maven.apache.org/plugins/)

Mostly this warning is nothing to worry about, but I recommend using a threadsafe version for your plugins if you are using the parallel build feature.