Java + Serial Printer

I have no idea where to start on this one. I was handed a Java application by my boss because I answered his question with "I used it for a couple days about 5 years ago" when he asked me if I was familiar with Java.

So here's my issue: This software connects to a receipt printer via serial port and prints receipts after a transaction was completed in the software.. For some reason the software only worked with Windows XP and so I was tasked with making it work under Vista and Windows 7.

Ok, so I just compile it with the latest compiler and it should work right? Well it did, sort of. It runs under windows 7 now just fine but the receipt printer no longer works. I had the /lib/rxtxcomm.jar file included with the compiled jar so in theory it should be working but for some reason it won't see the printer anymore.

Keep in mind, I wasn't joking with my Java experience. I played with it for a week just to see what it was about five years ago and with the exception of extensive Javascript use, I have no real working knowledge of this language but as I'm the only one at the company that can spell Java, and they're too cheap to hire a consultant, I'm stuck with this. Small words and baby talk would be appreciated.

Is there anyone that can give me some starting points or should I make sure my resume is up to date and tell the boss I can't do it?
fredstovAsked:
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Dave BaldwinFixer of ProblemsCommented:
You may not have all the files.  Take a look at this page: http://forums.sun.com/thread.jspa?threadID=698876  And 'Java' is not 'javascript' or even actually related.  In researching your question, I didn't see much in the way of good news.  The page I have linked said that Sun decided that serial and parallel ports weren't used much under Windows anymore.
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