xamde

A *very* simimlar library can be found at https://www.ohloh.net/p/wikipipes - now we can try to compare the two

I really enjoy XSTream for the simplicity to set it up, two lines of code are enough to serialize everything you want to a readable XML file. Even nicer: Afterwards you can manipulate the XML on disk and re-read it. Debugging was never easier.

You can (and I do) use XStream as well as a simple persistence layer for your applications. Its fast and stable enough.

Large files should go into a zipped stream.

This project is dead, but here is a complete working implementation: http://code.google.com/p/maven-gae-plugin/