JasperReports: "Error loading object from file" Exception

[Lance Gray]

So, I'm testing out how JasperReports works. I downloaded iReport so that I can make quick reports, too. I am using CSV files as a data source for my report. The problem is this. Whenever I run the program, it gives me this Exception in thread "main" net.sf.jasperreports.engine.JRException: Error loading object from file : reps.jasper error. How do I fix this?

Here are my codes so far.

package testlab;

import java.util.HashMap;
import java.util.Map;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.data.JRCsvDataSource;
import net.sf.jasperreports.engine.util.JRLoader;


public class TestLab {
 
    public static void main(String[] args) throws JRException {
        fill();
    }
    
  private static JRCsvDataSource getDataSource() throws JRException
  {
    String[] columnNames = new String[]{"id", "eng", "tag"};
    JRCsvDataSource ds = new JRCsvDataSource(JRLoader.getLocationInputStream("asd.txt"));
    ds.setRecordDelimiter("\r\n");
    ds.setColumnNames(columnNames);
    return ds;
  }

  public static void fill() throws JRException
  {
    long start = System.currentTimeMillis();
    JasperFillManager.fillReportToFile("reps.jasper", null, getDataSource());
    System.err.println("Filling time : " + (System.currentTimeMillis() - start));
  }
}

And here is my .jasper file generated by iReport.

<?xml version="1.0" encoding="UTF-8"?> <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="testreport" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20"> <property name="ireport.zoom" value="1.0"/> <property name="ireport.x" value="0"/> <property name="ireport.y" value="0"/> <field name="ID" class="java.lang.String"/> <field name="ENG" class="java.lang.String"/> <field name="TAG" class="java.lang.String"/> <background> <band splitType="Stretch"/> </background> <title> <band height="79" splitType="Stretch"/> </title> <pageHeader> <band height="35" splitType="Stretch"/> </pageHeader> <columnHeader> <band height="61" splitType="Stretch"/> </columnHeader> <detail> <band height="23" splitType="Stretch"> <textField> <reportElement x="0" y="0" width="100" height="20"/> <textElement/> <textFieldExpression><![CDATA[$F{ID}]]></textFieldExpression> </textField> <textField> <reportElement x="238" y="0" width="100" height="20"/> <textElement/> <textFieldExpression><![CDATA[$F{ENG}]]></textFieldExpression> </textField> <textField> <reportElement x="455" y="0" width="100" height="20"/> <textElement/> <textFieldExpression><![CDATA[$F{TAG}]]></textFieldExpression> </textField> </band> </detail> <columnFooter> <band height="45" splitType="Stretch"/> </columnFooter> <pageFooter> <band height="54" splitType="Stretch"/> </pageFooter> <summary> <band height="42" splitType="Stretch"/> </summary> </jasperReport>

[Rob Spoor]

Does file reps.jasper exist? The first argument to fillReportToFile is the source file name (or JasperReport object).

[Lance Gray]

Rob Spoor wrote:Does file reps.jasper exist? The first argument to fillReportToFile is the source file name (or JasperReport object).

Yes, it does. reps.jasper contains the XML code I posted above. Should I not have placed that code there?

[Rob Spoor]

That's not a problem. It may help someone else see a flaw in it. As I see it, there are two possible causes of the error:
1) the file cannot be read.
2) the file does not contain what it should.
I haven't worked with JasperReports so I only focus on the first possible cause.

OK, so there is a file reps.jasper. But is it located in the right location? What do you get when you add this at line 28:

System.out.println(new File("reps.jasper").getAbsolutePath());

Perhaps that's not what you expect it to be.

[Lance Gray]

No, it still doesn't work. I've even replaced "reps.jasper" with new File("reps.jasper").getAbsolutePath() but it still gives me the same error.

[Rob Spoor]

Did the printout I suggested print what you expected? If so, what do the following print:

System.out.println(new File("reps.jasper").exists());  
System.out.println(new File("reps.jasper").canRead());

If both print true then there probably is a mistake in the file itself, although I couldn't tell you where or what.

[Lance Gray]

It seems that the mistake was on the Jasper codes itself. I had a friend help me on this and it turned out I missed a few lines of code. Thanks for the help.

[Rob Spoor]

You're welcome.