Combining two Jasper reports

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Here is sample code for combining multiple jasper prints 

List<JasperPrint> jasperPrints = new ArrayList<JasperPrint>();
// Your code to get Jasperreport objects
JasperReport jasperReportReport1 = JasperCompileManager.compileReport(jasperDesignReport1);
jasperPrints.add(jasperReportReport1);
JasperReport jasperReportReport2 = JasperCompileManager.compileReport(jasperDesignReport2);
jasperPrints.add(jasperReportReport2);
JasperReport jasperReportReport3 = JasperCompileManager.compileReport(jasperDesignReport3);
jasperPrints.add(jasperReportReport3);

JRPdfExporter exporter = new JRPdfExporter();
//Create new FileOutputStream or you can use Http Servlet Response.getOutputStream() to get Servlet output stream
// Or if you want bytes create ByteArrayOutputStream
ByteArrayOutputStream out = new ByteArrayOutputStream();
exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperPrints);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, out);
exporter.exportReport();
byte[] bytes = out.toByteArray();

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