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Undefined variable: <name>

The most likely reason is the standard typo/caps problem.
Another reason is you might have declared the variable in the wrong block of code:

int i=5;
} variable i destroyed here
i++; error here
NOTE: The Java section is mostly in maintenence mode. I don't have time to work on it right now. Errors will be corrected if pointed out, but they are not actively being searched for. Newer site features, like alternate stylesheets, may cause problems with these pages.