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32 vs 64 bit - yet another complication in getting programs to work.

If you could look at why there is that error on that line it might help you solve your problem.
I have no idea how to get that file.

From the error message.
Do you have the source for the IfxDriver class? What does it do at line 266 in its connect method?

Where is the casting done with these classes?
NoClassDefFoundError
SQLException

Try uncommenting this to get the full error message without your edits:
//e.printStackTrace();