J2ME to personal Java, how much need to change

I have an appilication that is written in J2ME. Now i'd like to experiment how it runs on PersonalJava devices, such as Nokia Communicator.
How much I need to change. The app is small pop-mail program, that fetches emails from my mail server. It uses HttpConnection. The Gui is build with few Form.
Am I right when I assume that just the GUI parts have to be re-written (using AWT), mostly all the rest works. If I compile existing code with Jdk 1.1, are the errors I get the changes I need to do... Or is there something else too ?
Thanks in advance,
P_trig

The Idea was not to test the app on Desktop, but to convert it to PersonalJava and I wondered how much there is to change before J2ME app runs in PersonalJave Device.
My app runs fine, I know that already, but I need to make another version of it for PersonalJava. IE, which elements of current versions have to be rewritten, that's my question, not how to emulate J2ME on desktop.
Thanks,
P_trig

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