Problem in passing JRBeanCollectionDataSource as parameter to jasperreport

[Hindusthan Kamal]

I had created a java class which has array list, I has passed the array list as JRBeanCollectionDataSource to jasper report as

   
package cls_PrintJasper;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.util.JRLoader;

public class Cls_Action {


	@SuppressWarnings("unchecked")
	public static void main(String ar[]) throws JRException
	{
		try {
			
			ArrayList<Cls_Bean> al=new ArrayList<Cls_Bean>();
			Map jasperParameter = new HashMap(); 
			
			int i;
			
			//To create a Array Object//
			for(i=1;i<=10;i++)
			{
				Cls_Bean frm = new Cls_Bean();
				frm.setRno(""+i);
				frm.setStuname("ABC"+i);
				al.add(frm);
				System.out.println(i);
			}
			
			
			// Path of the Jasper Report (Extension Should be ".jasper") //
			// ".Jasper" file will be created on IReport folder (Default Location) on compilation // 
			String Context="D:/Jasper Workouts/FirstJasperReport/src/jasperDesign/Report_Main.jasper";
			
			// Creating JasperReport Object //
			JasperReport jasperReport = null;

			// Loading the Jasper File into JasperReport Object //
			JasperPrint jasperPrint = null;
			
			// Filling the Report with Values using Parameter//
			jasperParameter.put("sub_para", al);
			
			jasperReport = (JasperReport) JRLoader.loadObject(Context);
				
			
			
			jasperPrint = JasperFillManager.fillReport(jasperReport, jasperParameter,new JRBeanCollectionDataSource(al));
			
				
			
			// JasperPrintManager.printReport(jasperPrint, false); //
			
			
			// Creating JRPdfExporter object to export the report to PDF format //
			JRPdfExporter pdfexport = new JRPdfExporter();
		
			// Setting the Values as parameter //
			pdfexport.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
			
			// Setting the Destination File Name for the PDF (Extension Should be ".pdf") //
			pdfexport.setParameter(JRExporterParameter.OUTPUT_FILE_NAME,"D:/Report/sample1.pdf");
			
			// Exporting the Report to PDF //
			pdfexport.exportReport();
			
			System.out.println("Report Generated");
			
		} catch (Exception e) {
			System.out.println(e);
	}
		
		
	}
}
 

The error I am facing is

net.sf.jasperreports.engine.JRException: Error retrieving field value from bean : new JRBeanCollectionDataSource(sub_para)


I think the error is in jasper report, I am using ireport tool to design the reports

My question is how to create a new parameter in the main report, and how to pass the parameter to sub report..

Please help me to solve this...

[Rob Spoor]

Moving to Other Open Source Projects.