I recommend that you do some tests with simpler commands to try to narrow down where the mistake is. Replace the java line with having it echo something, for instance, or remove the "nice" bit. Make sure that the command runs on its own when it's not started through cron. Remove the unnecessary quotation marks from around "mc".
You'll need to keep troubleshooting and trying different things -- that's what I would do. Try running a bash script instead. Try running "echo". Keep paring things down until you find what about that line is causing the problem, and then focus on working around that.
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