This document provides an introduction and crash course on using the Java Content Repository (JCR) and Apache Jackrabbit implementation. It demonstrates how to create a repository and session, work with nodes and properties, perform queries using XPath and SQL, and discusses content modeling and versioning. The document encourages exploring more documentation on JCR and Jackrabbit at their Apache website.

1. Introduction to JCR and Apache Jackrabbit Jukka Zitting ApacheCon US 2008

2. JCR Crash Course! import javax.jcr.*; import org.apache.jackrabbit.core.TransientRepository; repository = new TransientRepository (); println repository. getDescriptor (Repository.REP_NAME_DESC); Jackrabbit

3. Sessions and Workspaces credentials = new SimpleCredentials( “username”, “password”. toCharArray ()); session = repository. login (credentials) workspace = session. getWorkspace () println workspace. getName () default println workspace. getAccessibleWorkspaceNames () { “default” }

4. Node Hierarchy root = session. getRootNode (); foo = root. addNode ("foo"); bar = root. addNode ("bar"); baz = bar. addNode ("baz"); println baz. getPath (); /bar/baz

5. Properties a = foo. setProperty ("A", "abc"); b = foo. setProperty ("B", "123"); println b. getPath (); /foo/B println b. getLong () + 321; 444

6. Transient State other = repository. login (); println other. itemExists ("/foo"); false session. save (); println other. itemExists ("/foo"); true

7. XPath Query qm = workspace. getQueryManager (); query = qm. createQuery ( "//*[A = 'abc']", "xpath"); nodes = query. execute (). getNodes (); println nodes. nextNode (). getPath (); /foo

8. SQL Query query = qm. createQuery ( "SELECT * FROM nt:base” + “ WHERE A = 'abc'", "sql"); rows = query. execute (). getRows (); println rows. nextRow () . getValue ("jcr:path"). getString () /foo

9. And Remember! session. logout () other. logout ()

10. Content Modeling nt:hierarchyNode nt:folder nt:file nt:linkedFile nt:resource

11. Bottom-Up Modeling my:resource > nt:resource codec (string)

12. bitrate (long) my:tune > nt:file artist (string)

13. release date (date) my:album > nt:folder artist (string)

14. release date (date) my:review > nt:file author (string)

15. star rating (long)

16. Top-Down Modeling Album Images Tune Band Label Label Tune Album Reviews Label Band Reviews Tune Images