settings.xml

<settings>

  <pluginGroups>
    <pluginGroup>org.jenkins-ci.tools</pluginGroup>
  </pluginGroups>

  <profiles>
    <profile>
      <id>jenkins</id>
      <pluginRepositories>
        <pluginRepository>
          <id>m.g.o-public</id>
          <url>http://maven.glassfish.org/content/groups/public/</url>
        </pluginRepository>
      </pluginRepositories>
      <repositories>
        <repository>
          <id>m.g.o-public</id>
          <url>http://maven.glassfish.org/content/groups/public/</url>
          </repository>
        </repositories>
    </profile>
  </profiles>

</settings>