The Apache Project has released Jackrabbit 1.0, an open source implementation of the Content Repository for Java Technology API (JCR) specified in the Java Specification Request 170.
Jackrabbit 1.0 is a fully conforming and stable JSR-170 implementation. Developed from the same source tree as the JSR-170 reference implementation, the 1.0 release implements the full JCR API, including level 1, level 2, and all the optional features like versioning, transactions, and observation.
Additional components include: