Wordpress in Java: nWordpress
nWordPress [1] is the Java counterpart of the WordPress project version 2.5.1. It is an easy to install and lightweight blogging engine with a rich administrative interface, nWordPress lets you concentrate on writing quality content.
nWordPress is an open-source project under the GPL license, same as WordPress. It currently provides almost all of the original functionality, with comparable performance.
Under the hood, nWordPress is built on the Spring MVC framework.