Presentation from the ApacheCon EU 2008 in Amsterdam. JCR In Action - Content-based Applications with Apache Jackrabbit. The Java Content Repository API (JCR) is the ideal solution to store hierarchical structured content and develop content-oriented applications. To demonstrate the basic architecture of such applications, an example content management application will be developed during the session. Basic techniques will be explained including navigation, searching and observations by using the Apache Jackrabbit project.