Tool for Swing

[Jim Paul <jimpaul@xxxxxxxx>]

Gentlemen & women,

I'm re-writing the simple application I use for professional billing 
with Swing and JDBC as a learning exercise.  I have gone through several 
simple Swing tutorials.  Can anyone recommend a next step like :
A free tool that helps build Swing/Database applications.  Ideally it 
would not isolate me from coding since the goal is to learn.
Or a simple application that I could modify.  Basically just need to 
enter multi-line invoices and apply payments to them.
P.S. I use Eclipse.

Thanks
Jim