Jasper reports: getting errors of class not found

Question

i'm trying to print my report but its not coming in jrviewer. this is exception which i'm getting

Exception in thread "main" java.lang.NullPointerException at net.sf.jasperreports.engine.fill.JRFillImage.evaluateImage(JRFillImage.java:1034) at net.sf.jasperreports.engine.fill.JRFillImage.evaluate(JRFillImage.java:1004) at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:258) at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:499) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillTitle(JRVerticalFiller.java:326) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:262) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:128) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:946) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:845) at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:58) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:417) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:247) at Reports.ReportView.(ReportView.java:36) at Main.main(Main.java:27)

This is my code: {

public class ReportView extends JFrame
{
    public ReportView(String fileName) throws Exception
    {
        this(fileName, null);
    }
    public ReportView(String fileName, HashMap para) throws Exception
    {
        super("ABC Solutions Employee/Project Management System (Report Viewer)");
        DBhandler db = new DBhandler();
        Connection con = db.getconnection();
        try
        {
            JasperPrint print = JasperFillManager.fillReport(fileName, para, con);
            JRViewer viewer = new JRViewer(print);
            Container c = getContentPane();
            c.add(viewer);            
        } 
        catch (JRException jRException)
        {

        }
        setBounds(10, 10, 1500, 1500);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    }

}
}

Try printing the values of fileName, para and con before calling 'fillReport'. — placeybordeaux

mightyrick mightyrick · Accepted Answer · 2013-02-13T20:38:37

Don't pass nulls. If you don't have any parameters, instantiate your parameter HashMap before passing it to Jasper. Even if it is empty:

   public ReportView(String fileName) throws Exception
   {
        this(fileName, new HashMap< String, String >() );
   }

Jasper reports: getting errors of class not found

2 Answers