Problem in java and symbianC++ connection

Hi to All,
I dont know where i should place this question even i dont know about actual problem. Please take a look on below description....

I have an exe that listen on port 8080(always in listening mode).
I have a J2ME application that pass a character by socket connection in to this exe and this exe call a video recording app, after finish recording i pass a character again to start this again so that i can take two recorded video.
Whole application is working properly in 6680 nokia device

but when i tried this application in nokia 6630 it calls first recording application and give an error (-1 java.lang.IndexOutofBoundException) .
I m not getting what is the actual problem it is device side or in application

Please help me resolve this

Thanks in advance