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subreport parameters in next() method


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I'm new to JasperReports. In my program I have all data loaded and maintained in Collections, so I prefer my own implementation of JRDataSource. However, when using a subreport, I need the primary key of the main detail row to decide whether there are subdetail rows in the next() method. I can provide a parameter to the subreport, but how do I access it in the next() method?




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