iReport com JSP

Preciso gerar um relatorio via web, entao estou utilizando o iReport. Usando a funcao q fiz numa aplicacao desktop funciona normal, mas, quando utilizo esta mesma funcao em paginas jsp, importando a classe, da erro, alguem poderia dar uma força de como solucionar isso?

Obrigado desde ja!

// Erro gerado

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: net/sf/jasperreports/engine/JRDataSource

org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)

org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)

org.apache.jsp.jsp.GerarBoleto_jsp._jspService(GerarBoleto_jsp.java:72)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NoClassDefFoundError: net/sf/jasperreports/engine/JRDataSource

org.apache.jsp.jsp.GerarBoleto_jsp._jspService(GerarBoleto_jsp.java:57)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

//Pagina que chama a classe relatorio

<%@ page language=“java” %>

<%@ page import = “java.sql.*, util.Relatorio”%>

<%  try

{

String sql="";

Connection con;

con = DriverManager.getConnection(session.getAttribute(“url”).toString(), “sa”, “”);

Relatorio relatorio = new Relatorio();

con.close();

}

catch (SQLException e)

{

System.out.println("Erro no sql: " + e.toString());

}

%>

Classe relatorio

package util;

import java.sql.<em>;

import net.sf.jasperreports.engine.</em>;

import java.util.*;

public class Relatorio {

ResultSet rs;

public Relatorio()

{

}

public void gerarRelatorio(Connection con) throws JRException

{

try

{

String sql=“SELECT * FROM ALUNO”;

Statement s = con.createStatement();

rs = s.executeQuery(sql);

JRResultSetDataSource jrRS = new JRResultSetDataSource(rs);
  	HashMap parameters = new HashMap();
  	JasperCompileManager.compileReportToFile("teste.xml", "Teste.jasper");
  	JasperPrint impressao = JasperFillManager.fillReport("Teste.jasper",parameters,jrRS);
  	JasperExportManager.exportReportToHtmlFile(impressao, "teste.html");


      }
  catch (SQLException e)
  {
    System.out.println("Erro no sql: " + e.toString());
  }

  }

}

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