Apache Jackrabbit 是由 ">Apache Foundation 提供的 JSR-170 的开放源码实现。Apache Jackrabbit is a fully conforming implementation of the Content Repository for Java Technology API (JCR, specified in JSR 170 and 283).
A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more.
Apache Jackrabbit is a project of the Apache Software Foundation.
Apache Jackrabbit 2.2.1 is patch release that contains fixes and improvements over Jackrabbit 2.2.0. See the downloads page for more details.
下载地址：http://jackrabbit.apache.org/downloads.html
改进内容：
Improvements
[JCR-2835] Poor performance of ISDESCENDANTNODE on SQL 2 queries
[JCR-2841] Avoid path resolution in case of non-wildcard ACEs ...
[JCR-2845] NodeBasedGroup#isMember(Principal) should have shortcut ...
Bug fixes
[JCR-1301] Trouble undeploying jackrabbit-webapp from Tomcat
[JCR-2836] Unclosed threads in Jackrabbit
[JCR-2840] Inconsistencies if "everyone" Group is created by User Management
[JCR-2843] ConstraintSplitter.getSelectorNames doesn't support ...
[JCR-2844] MaxCount not working correctly in user/group query when ...
[JCR-2850] RMI problems prevent proper startup of the Jackrabbit webapp