<project>
  ...
  <reporting> (or <build>)
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>3.0.1</version>
        <configuration>
          ...
          <additionalDependencies>
            <additionalDependency>
              <groupId>geronimo-spec</groupId>
              <artifactId>geronimo-spec-jta</artifactId>
              <version>1.0.1B-rc4</version>
            </additionalDependency>
          </additionalDependencies>
          ...
        </configuration>
      </plugin>
    </plugins>
    ...
  </reporting> (or </build>)
  ...
</project>