maven-settings.xml

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

    <profiles>
        <!-- Give access to Jenkins plugins -->
        <profile>
            <id>jenkins</id>
            <activation>
                <activeByDefault>true</activeByDefault> <!-- change this to false, if you don't like to have it on per default -->
            </activation>
            <repositories>
                <repository>
                    <id>repo.jenkins-ci.org</id>
                    <url>http://repo.jenkins-ci.org/public/</url>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>repo.jenkins-ci.org</id>
                    <url>http://repo.jenkins-ci.org/public/</url>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>
    <mirrors>
        <mirror>
            <id>repo.jenkins-ci.org</id>
            <url>http://repo.jenkins-ci.org/public/</url>
            <mirrorOf>m.g.o-public</mirrorOf>
        </mirror>
    </mirrors>
</settings>