core-it-suite/src/test/resources/mng-7160-extensionclassloader/project-core-self-first/.mvn/extensions.xml

<extensions>
  <extension>
    <groupId>org.apache.maven.its.mng7160</groupId>
    <artifactId>extension</artifactId>
    <version>1.0</version>
    <classLoadingStrategy>self-first</classLoadingStrategy>
  </extension>
</extensions>