Error when running mvn javadoc:javadoc

[ORESoftware]

I get this error when running mvn javadoc:javadoc:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:javadoc (default-cli) on project async.0.1: An error has occurred in JavaDocs report generation: 
[ERROR] Exit code: 1 - javadoc: warning - The old Doclet and Taglet APIs in the packages
[ERROR] com.sun.javadoc, com.sun.tools.doclets and their implementations
[ERROR] are planned to be removed in a future JDK release. These
[ERROR] components have been superseded by the new APIs in jdk.javadoc.doclet.
[ERROR] Users are strongly recommended to migrate to the new APIs.
[ERROR] javadoc: error - invalid flag: -author
[ERROR] 
[ERROR] Command line was: /usr/lib/jvm/java-11-openjdk-amd64/bin/javadoc @options @packages
[ERROR] 
[ERROR] Refer to the generated Javadoc files in '/home/oleg/codes/oresoftware/asyncc.java/target/site/apidocs' dir.
[ERROR] 
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

here is my pom.xml file:

<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/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.oresoftware</groupId>
    <artifactId>async.0.1</artifactId>
    <packaging>jar</packaging>
    <version>0.1.1012</version>
    <name>org.ores.async.Asyncc</name>
    <url>https://github.com/ORESoftware/async.java</url>

    <properties>
        <vertx.version>3.6.0</vertx.version>
        <jdk.version>10</jdk.version>
        <log4j.version>1.2.17</log4j.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>io.vertx</groupId>
                <artifactId>vertx-stack-depchain</artifactId>
                <version>${vertx.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <licenses>
        <license>
            <name>MIT License</name>
            <url>http://www.opensource.org/licenses/mit-license.php</url>
        </license>
    </licenses>

    <description>
        A Java port of the async library for Node.js. This lib is designed to be used with Vert.x and Akka.
    </description>

    <scm>
        <connection>scm:git:https://github.com/ORESoftware/async.java.git</connection>
        <developerConnection>scm:git:ssh://github.com:ORESoftware/async.java.git</developerConnection>
        <url>https://github.com/ORESoftware/async.java/tree/master</url>
    </scm>

    <dependencies>
        <dependency>
            <groupId>io.vertx</groupId>
            <artifactId>vertx-web</artifactId>
            <version>3.6.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>io.vertx</groupId>
            <artifactId>vertx-core</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>io.vertx</groupId>
            <artifactId>vertx-unit</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>async</finalName>
        <plugins>

            <plugin>
                <groupId>org.sonatype.plugins</groupId>
                <artifactId>nexus-staging-maven-plugin</artifactId>
                <version>1.6.8</version>
                <extensions>true</extensions>
                <configuration>
                    <serverId>ossrh</serverId>
                    <nexusUrl>https://oss.sonatype.org/</nexusUrl>
                    <autoReleaseAfterClose>true</autoReleaseAfterClose>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-gpg-plugin</artifactId>
                <version>1.6</version>
                <executions>
                    <execution>
                        <id>sign-artifacts</id>
                        <phase>verify</phase>
                        <goals>
                            <goal>sign</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <artifactId>maven-javadoc-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <doclet>ch.raffael.mddoclet.MarkdownDoclet</doclet>
                    <docletArtifact>
                        <groupId>ch.raffael.markdown-doclet</groupId>
                        <artifactId>markdown-doclet</artifactId>
                        <version>1.4</version>
                    </docletArtifact>
                    <useStandardDocletOptions>true</useStandardDocletOptions>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-source-plugin</artifactId>
                <version>3.0.1</version>
                <executions>
                    <execution>
                        <id>attach-sources</id>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>false</downloadJavadocs>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>${jdk.version}</source>
                    <target>${jdk.version}</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>**/log4j.properties</exclude>
                    </excludes>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <mainClass>com.mkyong.App</mainClass>
                            <classpathPrefix>dependency-jars/</classpathPrefix>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.5.1</version>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <!-- exclude junit, we need runtime dependency only -->
                            <includeScope>runtime</includeScope>
                            <outputDirectory>${project.build.directory}/dependency-jars/</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>

</project>