Re-using existing client application minus Swing.

Our company has developed a desktop application over the years and I'd be comfortable in stating that it's close to legacy status. The application has a Swing View and throughout the years, unfortunately, the BL and the presentation layer has become tightly coupled.
A challenge has been given to me to take this application and make it run as a 'service' (i.e. re-use the BL but without the Swing). I say service loosely here since the requirement is simply to transform the application to either a web-based or a handheld application. The application is fairly big (~1400 classes) so I can appreciate the reason to do so.
I'm looking for suggestions or direction as to how I should approach this task. A re-write is not an option. The application has a lot of code which requires user input (i.e. prompt for this, then prompt for that)
I'm not well versed in the innards of Swing although I have one idea which entails redirecting all ui calls to a handler of some sort (i.e. override all relevant methods in JPanel and rather than displaying to the screen, I'd create and XML representation of the panel and send it to a handler). The application would be running on the Swing Thread therefore only one application per client (which is ok)
Are there any tools/libraries out there that will do this or something similar?
Any suggestions to alternative solutions is greatly appreciated.
It sure sounds messy and I'm not looking forward to this.
Many thanks.
Marc

The basic approach is to separate UI from BL one
panel at a time.
When I say the BL and the UI is tightly coupled, I don't mean we have BL in our UI...we simply make several calls to the UI within our BL.
1) BL decides to display a prompt to allow user to enter Customer ID
2) Once panel returns, BL decides that Customer has more than one account
3) BL displays a prompt to allow user to chose a Customer account
4) Panel returns a Customer account ID
5) etc...
Create a data transfer object to hold the data that's
entered on the screen. The only role of the GUI
panels will be to display and enter data. Define the
interactions between it and the business logic.
I don't think this will solve my problem since we're not performing any BL (for the most part) in the UI Layer. I just want to swap the UI Layer...that's why I was considering overriding key methods in the Component.class and instead of displaying the ui, I'd use reflection and recreate an XML version of my panels and send that over to either a web interface or a handheld device for input. That way I wouldn't have to modify the BL at all.
If you're moving to a "service oriented
architecture," then you're largely constrained to
request-response operations. If your current GUI has
a lot of buried interaction (eg, selecting a value
from one list populates another), then you have to
give some real thought to how this applies to the
SOA.
I'd start poking around Martin Fowler's website ...
aside from being a/the major evangelist for
refactoring, he has worked with just these sorts of
separation issues.
http://martinfowler.com/
Thanks for all your suggestions.
Marc

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