CMS using Java

http://www.xwiki.org/xwiki/bin/view/Main/WebHome

http://www.xinco.org/

xinco DMS™ is a powerful Web-based Information and Document Management System (DMS) for files, text, URLs and contacts, featuring ACLs, version control, full text search and a fully web-based client.

http://webman-cms.sourceforge.net/

Webman is a professional content management or website production system. It was used in more than forty big websites in Germany. (look at the history section)

http://webeditor.sourceforge.net/index.html

webEditor is born with the intention to become a helpful tool for the web content management

http://velocity.apache.org/

Velocity is a Java-based template engine. It permits anyone to use a simple yet powerful template language to reference objects defined in Java code.

http://www.opencms.org/opencms/en/

OpenCms - Professional Content Management Easy to Use, Open Source, Reliable

http://www.cromoteca.com/en/meshcms/

https://sourceforge.net/projects/lportal/

The world's leading open source portal

https://github.com/florinpatrascu/jpublish

JPublish provides a powerful system for managing your web site's content as well as your web site's application logic.

http://www.jease.org/

Jease is an Open Source Content-Management-System which is driven by the power of Java. Jease means "Java with Ease", so Jease promises to keep simple things simple and the hard things (j)easy.