Jasper Report questions.

package abc;
import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import java.sql.*;
import net.sf.jasperreports.engine.*;import net.sf.jasperreports.engine.design.JasperDesign;import net.sf.jasperreports.engine.export.*;import net.sf.jasperreports.engine.xml.JRXmlLoader;import net.sf.jasperreports.view.JasperViewer;public class JasperReport {
public static void main(String[] args) {  // TODO Auto-generated method stub
  String url = "XXX";  String user = "XXX";  String pwd = "XXX";  try {   Connection connRead = DriverManager.getConnection(url, user, pwd);   String address = "C:\\JaspersoftWorkspace\\MyReports\\First.jrxml";   InputStream inputStream = new FileInputStream (address);   JasperDesign jasperDesign = JRXmlLoader.load(inputStream);   net.sf.jasperreports.engine.JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);   JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, connRead);   JasperExportManager.exportReportToPdfFile(jasperPrint, "c:/A/test_jasper.pdf");   JasperViewer.viewReport(jasperPrint);  } catch (SQLException | JRException | FileNotFoundException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }   }
}