We have a large existing website (written in Java/Spring/Hibernate/JSP) and want to add a Content Management System to allow our employees to manage sections of existing pages and in certain cases the body of entire pages (such as jobs/contact/press-release/etc).
The catch is most open-source CMS's we've looked at like Drupal, Radiant, Joomla, etc seem to be designed so that you build an entire website on-top of the CMS. Whereas we want a CMS that's designed to be integrated in an existing site (perhaps via API's).
Any suggestions?
We went through a vetting process and chose Alfresco.
This might help you pick one that is right for you. Open Source Content Management Systems (CMS) in Java