This plugin isn't bundled in the maven 1 distribution thus you have deploy it in your local installation of maven 1, or you have to define it in your project dependencies (RECOMMENDED).
We suppose that CURRENT_VERSION is the version of the plugin you want to use. The changes report gives you the list of versions actually available.
If you want to use a SNAPSHOT of this plugin, you'll certainly have to add the following remote repositories in your settings (property
http://snapshots.dist.codehaus.org/modello/: To acquire snapshots of modello.
http://people.apache.org/repo/m1-snapshot-repository/: To acquire snapshots of the modello plugin for m1.
To install it locally, you just have to launch this command :
maven plugin:download -DgroupId=maven -DartifactId=maven-modello-plugin -Dversion=CURRENT_VERSION
You have to do it on all installations of maven 1 which will be used to build your project.
You can easily ask to maven to download/install/use this plugin in your project. You just have to add in your project POM a dependency to this plugin :
<dependency> <groupId>maven</groupId> <artifactId>maven-modello-plugin</artifactId> <version>CURRENT_VERSION</version> <type>plugin</type> </dependency>