Hi all! I am quite new in the Jasper reporting world, and I am confused about the behaiviour of subreports. I have been looking around in different forums (sometimes questions dating from more than a decade ago!) and I cannot find any definite answer. My problem is that I would like to create a main report containing four subreports in it, each of them gathering data from a different .CSV data source. When I try to define the data connection for each of the subreports, I don't know what to choose. If I pick "empty data source", the structure of the subreports will be shown, but will all data being null values. Everything else I tried resulted in the subreports not being shown at all. According to some, what I want is impossible to achieve. According to others, I have to manually define the "data source expression" in the subreport properties, but I don't know what to put there. Any ideas? Thank you!
