How to collate multiple jrxml jasper reports into a one single pdf output file

Question

I have to prepare reports using five different sql queries. Each query will give out one report table.

So I wrote 5 jrxml files each corresponding to one of the abov

Answer 1

You can take advantage of exporting the whole jasperprint list:

List jpList = new ArrayList();
jpList.add(JRLoader.loadObjectFromFile("build/reports/Report1.jrprint")); 
...
JRExporter exporter = new JRPdfExporter(); 
exporter.setParameter(JRPdfExporterParameter.JASPER_PRINT_LIST, jpList); 
exporter.setParameter(JRPdfExporterParameter.OUTPUT_STREAM, stream); 
exporter.exportReport();