/**
 * The goal prefix that will appear before the ":".
 * 
 * @parameter
 */
protected String goalPrefix;
...

public void execute()
    throws MojoExecutionException
{
    if ( !project.getPackaging().equals( "maven-plugin" ) )
    {
        return;
    }

    String defaultGoalPrefix = PluginDescriptor.getGoalPrefixFromArtifactId( project.getArtifactId() );
    if ( goalPrefix == null )
    {
        goalPrefix = defaultGoalPrefix;
    }
    else
    {
        getLog().warn( "Goal prefix is: " + goalPrefix + "; Maven currently expects it to be " + defaultGoalPrefix );
    }

protected void executeReport( Locale locale )
    throws MavenReportException
{
    if ( !project.getPackaging().equals( "maven-plugin" ) )
    {
        return;
    }

    String goalPrefix = PluginDescriptor.getGoalPrefixFromArtifactId( project.getArtifactId() );

    // TODO: could use this more, eg in the writing of the plugin descriptor!
    PluginDescriptor pluginDescriptor = new PluginDescriptor();

    pluginDescriptor.setGroupId( project.getGroupId() );

    pluginDescriptor.setArtifactId( project.getArtifactId() );

    pluginDescriptor.setVersion( project.getVersion() );

    pluginDescriptor.setGoalPrefix( goalPrefix );