*
     * This callback is intended to allow extensions to perform cleanup of any
     * allocated external resources after the build. It is invoked on best-effort
     * basis and may be missed due to an Error or RuntimeException in Maven core
     * code.
     *
     * @param session the Maven session
     * @throws MavenExecutionException in case of issue
     * @since 3.2.1, MNG-5389
     */

  <version>0.1</version>
  <packaging>pom</packaging>

  <!--
  NOTE: This extends the test to check an edge case of URL adjustment which must not error out during inheritance
  if the child misses the artifactId (as to be reported by validation).
  -->
  <url>https://maven.apache.org/</url>

    /**
     * Helper class to traverse graph. Required to make the containing method thread-safe
     * and yet use class level data to lessen stack usage in recursion
     */
    private class ClasspathGraphVisitor {
        MetadataGraph graph;

        ClasspathContainer cpc;

        List<MetadataGraphVertex> visited;