How to run a java project based on x86 Windows XP on Windows CE?

I am a freshbird of J2ME and i am very confused these days.I beg you can look this topic thoughout.
I used to configurate a Java Project File about SIP&VOIP successfully,and I can run it well on my PC .
Now I want to migrate the project to a Mobile OS,and problems comes.
I have installed the Windows CE 5.0 Evalution Edition on my machine(Windows XP SP2) and it works fine.I search it online for days ,and I download almost all related including CLDC(j2me_cldc-1_1-fcs-src-winunix.zip),MIDP(midp-2_0-fr-spec.zip<==Maybe this is not the right one beacuse it don't have a bin folder),and J2ME Wireless Tool KIt(j2me_wireless_toolkit-2_2-ml-windows.exe).
I have configrate the enviroment-variable already , but I don't kown what to do next . Do you kown? I would be very thankfull.

You need to completely rewrite the app to use the mobile APIs as they're very different from the PC ones, I suppose.

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