src/it/projects/examples/alternate-doclet/pom.xml

<?xml version='1.0' encoding='UTF-8'?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.plugins.javadoc.example</groupId>
  <artifactId>alternate-doclet</artifactId>
  <version>1.0.0-SNAPSHOT</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>@maven.compiler.source@</maven.compiler.source>
    <maven.compiler.target>@maven.compiler.target@</maven.compiler.target>
  </properties>
  
  <url>http://maven.apache.org/plugins/maven-javadoc-plugin/examples/alternate-doclet.html</url>

  <build>
    <plugins>
      <!-- START SNIPPET: umlgraph -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>@project.version@</version>
        <configuration>
          <doclet>org.umlgraph.doclet.UmlGraphDoc</doclet>
          <docletArtifact>
            <!-- UMLGraph cannot be used with Java 9 or above due to substantial changes in the JavaDoc Doclet API-->
            <groupId>org.umlgraph</groupId>
            <artifactId>umlgraph</artifactId>
            <version>5.6.6</version>
          </docletArtifact>
          <additionalOptions>
            <option>-views</option>
          </additionalOptions>
        </configuration>
      </plugin>
      <!-- END SNIPPET: umlgraph -->
    </plugins>
  </build>
</project>