Apache Maven Javadoc Plugin – Generate aggregate Javadoc without duplicate execution of phase compile.

Generate aggregate Javadoc without duplicate execution of phase compile.

The standard goals aggregate and test-aggregate invoke separate lifecyles compile and test-compile.
In a CI environment you now might execute something like mvn clean deploy site site-deploy.
During site build the standard reports will trigger compile or test-compile again, depending on your build this may take some time, because stuff like enforcer or generating stubs from a WDSL will be invoked again, which may lead to longer build times.
As of version 3.0.1 two new reports are defined, aggregate-no-fork and test-aggregate-no-fork which will not trigger above phases a second time.

Configure this in your reporting section as follows:

<project>
  ...
  <reporting>
    <excludeDefaults>true</excludeDefaults>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>3.6.3</version>
        <reportSets>
          <reportSet>
            <reports>
              <report>aggregate-no-fork</report>
              <report>test-aggregate-no-fork</report>
            </reports>
          </reportSet>
        </reportSets>
      </plugin>
    </plugins>
  </reporting>
  ...
</project>