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I'd like to create a Java application that would run on a desktop machine and would print an invoice whenever a transaction was to occur on a specific website. Basically, it would constantly ping the web server - if it found that a new transaction occurred, it would print an invoice based on a template and pull the data from the SQL database to fill in the template.
The idea is that this application runs on the sellers end - whenever a sale of their product occurs, their invoice prints automatically. It would need to run on Mac and Windows machines.