In this article, I will show you how the DRY principle can be applied when using the skinny war configuration of the maven-war-plugin. While packaging an EAR, it is sometimes suitable that all libraries of the different WARs be contained not in their respective WEB-INF/lib folders but at the EAR level so they are usable by all WARs. Some organizations even enforce this rule so that this is not merely desiarable but mandatory. Using Maven, nothing could be simpler.