Is retrolambda threadSafe?

[andresluuk]

When I compile my project I get the following warning:
mvn clean install -T6

[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 ...:
[WARNING] net.orfjackal.retrolambda:retrolambda-maven-plugin:2.5.7
[WARNING] Enable debug to see more precisely which goals are not marked @threadsafe.
[WARNING] *****************************************************************