fork of http://www.sickboy.cz/checkstyle/download.html to work with v6.1.1 of checkstyle and netbeans 8
mvn clean install
The two npm files you need will be located under
netbeans-checksyle/netbeans-checksyle-library/target/netbeans-checkstyle-library.nbm
netbeans-checksyle/netbeans-checksyle-plugin/target/netbeans-checkstyle-plugin.nbm