Hello everybody!
When I spoke to Olimex support they offered to share my experience about working with GPIO and using Olinuxino A13 on the forum. So, I've posted my video here: http://www.youtube.com/watch?v=Hn8BhAhZg6Y (http://www.youtube.com/watch?v=Hn8BhAhZg6Y) showing how to work with GPIO ports using Java SE. I will be glad if someone find this video interesting and useful.