Java Object Notation is an extension to the JSON data format suitable for the serialization of Java objects. The intuitive format and the simple yet extensible library allow both humans and computers to read and write complex object graphs.
JON is currently hosted by the kind folks at SourceForge at http://sf.net/projects/jon.
JON has an official alpha release. Download the binary or source jar from the project download page.
There is now an org.fuwjax.sample package of the src/sample/java tree in the test-source jar available from the project download page, or the svn repository. The configuration and files used are in the src/sample/resources of the test-source jar and can also be seen in the repository. Note that all three of the .jon files in the resources directory were generated by hand.