I've used it in my Java Swing GUI app which I open sourced (https://github.com/jjk3/scrape-it-screen-scraper https://github.com/jjk3/scrape-it-screen-scraper) i

I've used it in my Java Swing GUI app which I open sourced (https://github.com/jjk3/scrape-it-screen-scraper https://github.com/jjk3/scrape-it-screen-scraper) in year 2012, because the other Object database cost licensing money (in small letters). It was the only joy I got from working with a Java Swing. It's excellent to just store Java Objects directly to the local filesystem. If you don't like that, you can setup a OrientDB server. The writer of OrientDB was super helpful too (always on google groups helping out). It's flexibility outdoes MongoDB. I'm surprised that it's catching on now...after 2 years.