The link: "using ResourceBundles" on the manual (http://cal10n.qos.ch/manual.html) is broken. Oracle redirects to the generic java page, but it's probably more appropriate to link to: https://docs.oracle.com/javase/tutorial/i18n/resbundle/concept.html

or perhaps:
http://www.oracle.com/technetwork/articles/javase/resourcebundles-141327.html