I am working with robust Java enterprise applications in my full-time job for 4 years. I am really familiar with Java, I also use JSON and JDBC every day. So, long story short, this is an easy piece of work for me, and I hope I can do it for you.
I worked for one of the biggest online travel agencies before as a developer and as a deputy development lead. Currently I am working for a navigation company, which is a leader in the automotive, wireless and personal navigation industries.
Actually, this is my first application on this site, I think this is a nice task to start with. I hope we can work together.