JeCARS (Java Extendable Contents And Rights System) is a RESTful webservice which delivers pluggable output formats, e.g. Atom feeds or HTML.
Third party applications can be plugged in.
A JCR (JSR-170) repository (Jackrabbit) is used for storage.
The OJB Console is an extensible struts web application featuring transparent browse, search, create, update and delete functionality for the objects configured within the Object Relational Bridge (OJB) persistence framework.
BeanQuery is a Java solution that allows for querying arbitrary collections of arbitrary object types by using a criteria like API in a declarative and typesafe manner.