The Checkstyle plugin has no idea which files are changed or new. The only way to gradually add a checkstyle to the project will involve configuration, manually placing new files / packages, etc. This is a comma-separated list of patterns.
<executions> <execution> <id>checkstyle-verify</id> <phase>verify</phase> <goals> <goal>check</goal> </goals> <configuration> <includes>NewClass.java,AnotherClass.java</includes> </configuration> </execution> </executions>
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