Major Description
When tomcat6-maven-plugin is used in a parallel build, maven says that the plugin is not thread-safe :
[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 #############:
[WARNING] org.apache.tomcat.maven:tomcat6-maven-plugin:2.1
[WARNING] *****************************************************************
It will be nice to review the plugin to ensure that it is thread-safe and add a @threadSafe annotation to it.
More details about the parallel builds: https://cwiki.apache.org/MAVEN/parallel-builds-in-maven-3.html