Here is a little thread on the server side about a new book on JDO:
http://theserverside.com/home/thread.jsp?thread_id=15488
There is also a list of different OR mapping tools (cayenne included :-)
Open source Object-relational mapping tools for Java:
ObjectBridge
http://jakarta.apache.org/ojb/
Castor JDO
http://www.castor.org/
http://sql2java.sourceforge.net/
http://jgrinder.sourceforge.net/
http://hibernate.sourceforge.net/
JORM
http://www.objectweb.org/jorm/index.html
JBoss JAWS project (JBossCMP)
http://www.jboss.org/developers/projects/jboss/jaws.jsp
http://objectstyle.org/cayenne/
Jakarta Torque
http://jakarta.apache.org/turbine/torque/
http://databind.sourceforge.net/
See also:
JDO
http://www.jdocentral.com/
http://www.objectmatter.com/vbsf/docs/maptool/ormapping.html
http://www.ambysoft.com/mappingObjects.html
http://www.ambysoft.com/persistenceLayer.html
http://www.theserverside.com/home/thread.jsp?thread_id=14314
Java DAO (Data Access Objects)
http://sourceforge.net/projects/basejdao
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