JasperReports: Passing in a list of lists as a datasource

Question

I need to populate a few subreports with lists of different objects. Basically lets say i have the following:
Subreport on used Vehicles
Subreport on new Vehicles<

Answer 1

Ok, then you need create two fields with the Field Class as java.util.List, one for each list (newVehiclesList and usedVehiclesList).

Put your two SubReports wherever you want and click on each one doing the following steps:

Change the "Connection type" to "Use a datasource expression" then change the "Data Source Expression" to new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{yourField})

Done.

ps: In order to use the fields inside your newVehiclesList and usedVehiclesList you have to create them inside of their own subReports.