Update: I copied the code of [...]FishbowlserverReportsCommonMemo.jrxml, created a new, blank Jasper Report, and pasted that code into it, and saved as [...]MyReportsBlank_A4.jrxml. I right clicked on Blank_A4.jrxml in the Project Explorer and clicked "Build Project", and Jaspersoft Studio did not build a.jasper file with these contents or name, instead it created the totally unrelated file [...]FishbowlserverReportsCustomerCustomerDetailsList.java. It's like it thinks CustomerDetailsList.jrxml is what is being selected for compiling.