Calling a Maven plugin from another plugin

[...]
* @requiresProject
* @requiresDependencyResolution compile
* @threadSafe
*/
public class FormatMojo extends AbstractVerifyMojo
{
   /**
     * The project currently being build.
     *
     * @parameter expression="${project}"
     * @required
     * @readonly
     */
   private MavenProject mavenProject;

   /**
     * The current Maven session.
     *
     * @parameter expression="${session}"
     * @required
     * @readonly
     */
   private MavenSession mavenSession;

   /**
     * The Maven BuildPluginManager component.
     *
     * @component
     * @required
     */
   private BuildPluginManager pluginManager;

[...]

   @Override
   public void execute() throws MojoExecutionException, MojoFailureException
   {
[...]
       // I needed to add a plugin dependency where my license.txt file is located.
       Dependency dep = new Dependency();
        dep.setGroupId("org.xwiki.commons");
        dep.setArtifactId("xwiki-commons-tool-verification-resources");
        dep.setVersion("5.4");

        Plugin licensePlugin = plugin(
            groupId("com.mycila"),
            artifactId("license-maven-plugin"),
            version("2.6"));
        licensePlugin.setDependencies(Collections.singletonList(dep));

        executeMojo(
            licensePlugin,
            goal("format"),
            configuration(
                element(name("header"), "license.txt"),
                element(name("strictCheck"), "true"),
                element(name("headerDefinitions"),
                    element(name("headerDefinition"), "license-xml-definition.xml")),
                element(name("includes"),
                    element(name("include"), "src/main/resources/**/*.xml"))
           ),
            executionEnvironment(
               this.project,
               this.mavenSession,
               this.pluginManager
           )
       );
   }

[...]
}