<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
+ <configuration>
+ <!--<propertyExpansion>checkstyle.violationSeverity=error</propertyExpansion>-->
+ <includeTestSourceDirectory>true</includeTestSourceDirectory>
+ </configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>