We follow the versioning from Maven itself:
Where:
Plugins can have snapshot releases for testing, or beta releases for wider testing and a bit more stability. Sandbox plugins should only use snapshot versions.
Once a plugin is ready for another release or is about the graduate from the sandbox, follow the checklist for performing a release.
To debug Maven 2 with IDEA use this command:
MAVEN_OPTS="-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005" mvn install