Java 6 upgrade.
Java 6 upgrade.

recena/checkstyle-plugin,jenkinsci/checkstyle-plugin,jenkinsci/checkstyle-plugin,recena/checkstyle-plugin,amuniz/checkstyle-plugin,amuniz/checkstyle-plugin,recena/checkstyle-plugin,eidottermihi/checkstyle-plugin,eidottermihi/checkstyle-plugin,eidottermihi/checkstyle-plugin,jenkinsci/checkstyle-plugin,amuniz/checkstyle-plugin