I'm guessing you switched to Java 8. In this version Javadoc is stricter on the requirements.
You have three choices:
- Fix the errors
- disable the strict checking
- skip Javadoc when building
To disable the strict checking, add this to your pom.xml
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<configuration>
<additionalparam>-Xdoclint:none</additionalparam>
</configuration>
</plugin>
</plugins>
to skip Javadoc while building, use this:
mvn -Dmaven.javadoc.skip=true verify