[Hachima]

I haven't used jgrasp before but does it let you debug and step through the code? Set watches to see values as you step through the lines of code?

I use Eclipse which lets you do all that. If it doesn't let you debug your code I'd suggest switching to an IDE that does. It helps a lot of following your code and looking for errors.

Edit: The reason I say this is because instead of telling you exactly what is missing/wrong(it is pretty obvious why nothing prints when you try to list the data) it's better to learn how to step through your code and find your own errors. Either doing it my hand or using a debugger to step through the code line by line.