Having trouble in generating Jasper report!!!

[gsuns82]

Hi all,
* I am working on jasper reports,I have successfully generated sample pdf report from a java program.

* But i am getting problems when i tend to call that report genarating method from a commandButton of a jsp page.

The java code executed successfully:
*******************************************
getpdf()
{
jasperReport = JasperCompileManager.compileReport( "c:\\Report.jrxml");

jasperPrint = JasperFillManager.fillReport(
jasperReport, new HashMap(), new JREmptyDataSource());

JasperExportManager.exportReportToPdfFile(
jasperPrint, "c:\\sample.pdf");

}

The Report.jrxml file:
************************
<?xml version="1.0"?>
<!DOCTYPE jasperReport
PUBLIC "-//JasperReports//DTD Report Design//EN"
"http://jasperreports.sourceforge.net/dtds/jasperreport.dtd">

<jasperReport name="Simple_Report">
<detail>
<band height="20">
<staticText>
<reportElement x="180" y="0" width="200" height="20"/>
<text><![CDATA[Hello World!]]></text>
</staticText>
</band>
</detail>
</jasperReport>

jsp page code for calling that getpdf() method:
************************************************** **
<h:commandButton styleClass="buttonimg"
image="../../" value=" " action="#{OrderList.getPdf}" />


Exception I got:
******************
package net.sf.jasperreports.engine does not exist
import net.sf.jasperreports.engine.*;

For ur kind attention:
************************
* I can able to generate pdf report successfully when i execute getpdf() as a stand alone java program.

* But i am getting exception, only wen i tend to call that getpdf() method from a jsp as mentioned above.The report was not compiled due to unavailable packages.

Did anyone face this problem,kindly get me a solution for this problem,I am almost stuck wit this crisis,dono know how to proceed further???

Awaiting ur ideas on it.

Thanks In Advance,
Sundar.