<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-javadoc-plugin</artifactId>
  <configuration>
    <doclet>com.automation.xmldoclet.XmlDoclet</doclet>
    <additionalparam>
        -d ${project.build.directory}
        -filename ${project.artifactId}-${project.version}-javadoc.xml
    </additionalparam>
    <useStandardDocletOptions>false</useStandardDocletOptions>
    <docletArtifact>
      <groupId>com.automation</groupId>
      <artifactId>xml-doclet</artifactId>
      <version>2.0.0</version>
    </docletArtifact>
  </configuration>
</plugin>

javadoc -doclet com.automation.xmldoclet.XmlDoclet \
  -docletpath xml-doclet-2.0.0-jar-with-dependencies.jar \
  [Javadoc- and XmlDoclet-Options]

-d <directory>            Destination directory for output file.
                          Default: .

-docencoding <encoding>   Encoding of the output file.
                          Default: UTF8

-dryrun                   Parse javadoc, but don't write output file.
                          Default: false

-filename <filename>      Name of the output file.
                          Default: javadoc.xml

package com.example;

/**
 * Worlds greeter.
 */
public class HelloWorld {

    /**
     * Greets all worlds.
     *
     * @param worlds list of worlds to greet
     * @return       a greeting to everyone!
     */
    public String hello(List<String> worlds) {
        return "Hello " + worlds.toString();
    }
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
  <package name="com.example">
    <class name="AnnotatedParameter" qualified="com.example.HelloWorld" scope="public" abstract="false" error="false" exception="false" externalizable="false" included="true" serializable="false">
      <comment>Worlds greeter.</comment>
      <class qualified="java.lang.Object"/>
      <constructor name="AnnotatedParameter" signature="()" qualified="com.example.HelloWorld" scope="public" final="false" included="true" native="false" synchronized="false" static="false" varArgs="false"/>
      <method name="hello" signature="(java.util.List&lt;java.lang.String&gt;)" qualified="com.example.HelloWorld.hello" scope="public" abstract="false" final="false" included="true" native="false" synchronized="false" static="false" varArgs="false">
        <comment>Greets all worlds.</comment>
        <tag name="@param" text="worlds list of worlds to greet"/>
        <tag name="@return" text="a greeting to everyone!"/>
        <parameter name="worlds">
          <type qualified="java.util.List">
            <generic qualified="java.lang.String"/>
          </type>
        </parameter>
        <return qualified="java.lang.String"/>
      </method>
    </class>
  </package>
</root>

Copyright 2018, MarkusBernhardt
Copyright 2020, vojtechhabarta
Copyright 2022, CloudBlue

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.