In my lab yesterday on Windows XP and Excel the importing of the Attached Excel spreadsheet and the created Customer.java resulted in an odd error problems when working with a Drools Project. In the morning session it only affected a few students, in the afternoon it was almost all making me wonder if this is an error that shows up after one or more restarts and recreations of the exact same project. The error was around that the setBenefitAmount is not available, or that there is a not a getter for Age. As you can see they exist, yet this error was there. The error might have gone away with a few saves of the Excel spreadsheet, but not always. Almost appears to me to be related to the load on the machine as in the afternoon a Antivirus scan started, making me think this is an odd timing, building, compiling, etc problem. I have only seen this on windows, and only on a few of the machines in the lab.