Apache Jackrabbit Java Apache Jackrabbit Content Repository The Apache Jackrabbit project is an effort to build and maintain an open source implementation of the Content Repository for Java technology API (JCR). The JCR 1.0 API is specified in the Java Specification Request 170 (JSR 170) and work on the JCR version 2.0 has begun in JSR 283. Stable Release 2006-04-08 1.0 Content Repository for Java technology (JCR) API JCP JSR 170