Applet error with changing variable data after several runs....

Question

Can anyone give some advice on the following:
I have a java card program running on a gsm sim:
The program makes use of member variables which
contain data that is reused and rewritten all the time.
The member variables are all declared as (for example)
private byte[] myVariable = {(byte) ' ',(byte) ' '};
And the values stored in the variables are changed
everytime the program gets an event. This works fine
for about 15 - 35 times and then suddenly the program
can't execute any code that accesses these variables (the
other parts that simply display a message or the menu and that
never change their variable's value have no problem running on).
Does anyone know a specific reason for this ? Should I rather
use my own EF entries on the SIM to keep data ? Is there any
specific rules around using variables and reusing them ?
The only fix (once this occurs) seems to be to reload the applet
onto the card...resetting the phone etc. does not change this
behaviour....
Any help would be much appreciated...

Answer 1

I don't think that your problem lies in your private member variable.
From my point of view it is more likely that you some kind of memory allocation problem somewhere.
Anyway it is always a good idea to post a minimal applet which reproduces the erroneous behaviour.