how to imbed Ftpserver and its allied class in Swing

[Rajeev kamal]

Hello,
Can somebody  please show me how to imbed FtpUser and its allied classes 
in a swing GUI I am building.
Everytime I use it I get either "java.lang.NullPointerException" or must 
catch exception.

What I want to do is
1. Build and GUI and use the classes for Ftpusers like FptServer, Users, 
etc in the GUI with least amount of coding for already well built classes.

A sample code will be very much appreciated. currently I have two 
classes. One Swing Class and other class when I want to call all the 
necessary class of FtpServer and do some processing.
Thanks,
Rajeev