Try fix javadoc generation
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
+ <version>3.2.0</version>
<configuration>
+ <source>8</source> <!-- https://bugs.openjdk.java.net/browse/JDK-8212233 -->
+ <release>8</release> <!-- https://bugs.openjdk.java.net/browse/JDK-8212233 -->
<additionalJOption>-Xdoclint:none</additionalJOption>
</configuration>
</plugin>
