With my you don't create a global, but a lexical. You want to

use vars qw/$opt_J ... and so on .../;
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at the top of your program. This way, you'll tell your program that you're going to use those global variable names, and strict won't complain. I suggest to read Lexical scoping like a fox and Coping with Scoping. I think there will be a column by merlyn on this subject soon.