As pointed out by Guillaume on github (https://github.com/hibernate/hibernate-search/pull/998#issuecomment-189363783) checkstyle finds errors when explicitly called on the project via the maven command: "mvn -DskipTests checkstyle:check". This however doesn't occur during a normal build via i.e. "mvn clean install".

We will have to update the files in error and then should be fine.