maven-archetype/maven-archetype-plugin/src/main/resources/plexus.xml

<plexus>
  <components>
    <component>
      <role>org.codehaus.plexus.builder.PlexusBuilder</role>
      <implementation>org.codehaus.plexus.builder.DefaultPlexusBuilder</implementation>
      <requirements>
        <requirement>
          <role>org.apache.maven.artifact.resolver.ArtifactResolver</role>
        </requirement>
        <requirement>
          <role>org.apache.maven.artifact.collector.ArtifactCollector</role>
        </requirement>
        <requirement>
          <role>org.apache.maven.project.MavenProjectBuilder</role>
        </requirement>
        <requirement>
          <role>org.codehaus.plexus.velocity.VelocityComponent</role>
        </requirement>
      </requirements>
    </component>

    <component>
      <role>org.codehaus.plexus.velocity.VelocityComponent</role>
      <implementation>org.codehaus.plexus.velocity.DefaultVelocityComponent</implementation>
      <configuration>
        <properties>
          <property>
            <name>resource.loader</name>
            <value>classpath</value>
          </property>
          <property>
            <name>classpath.resource.loader.class</name>
            <value>org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader</value>
          </property>
        </properties>
      </configuration>
    </component>
  </components>
</plexus>