I am trying to make a pdf file using java file and also using jasperreport only ,but gets an error.Below is the java code and .jrxml code.

When i first try compileReportToFile it execute successfully then i commented the JasperCompileManager line and added fillReportToFile line ,then run the file which result into error.

Below is the java and .jrxml code.
Regjes.java

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;

public class FirstReportCompile
{
  public static void main(String[] args)
  {
    try
    {
      System.out.println("Compiling report...");
      JasperCompileManager.compileReportToFile("report/template/HelloW.jrxml");
      System.out.println("Done!");
    }
    catch (JRException e)
    {
      e.printStackTrace();
    }
  }
}

Regjes.java

import java.util.HashMap;

import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;

public class FirstReportFill
{
  public static void main(String[] args)
  {
    try
    {
      System.out.println("Filling report...");
      JasperFillManager.fillReportToFile    ("./report/template/HelloReportWorld.jasper",
          new HashMap(), new JREmptyDataSource());
      System.out.println("Done!");
    }
    catch (JRException e)
    {
      e.printStackTrace();
    }
  }
}

HellW.jrxml

<?xml version="1.0"?>
<!DOCTYPE jasperReport
  PUBLIC "-//JasperReports//DTD Report Design//EN"
  "http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">
<jasperReport name="HelloReportWorld">
 <detail>
    <band height="20">
      <staticText>
        <reportElement x="20" y="0" width="200" height="20"/>
        <text><![CDATA[If you don’t see this, it didn’t work]]></text>
      </staticText>
    </band>
  </detail>
</jasperReport>