Error calling a native method in Java bean

package BeanDir;
import java.util.*;
//This file must be compiled Manually using javac
//cd D:\tomcat\webapps\examples\WEB-INF\classes\BeanDir\mysimplebean.java
public class mysimplebean
{
static
{
String s=System.getProperty("java.library.path");
System.setProperty("java.library.path",s);
System.loadLibrary("HelloWorld");
}
public String getceoname()
{
String ceonameval = "Tom Hanks CEO of Tom Hanks INC";
return ceonameval;
}
public String ceoemail()
{
String ceoemailval = "tom@tomhanksinc.com";
return ceoemailval;
}
public double findtakehome(int salary,String designation)
{
double takehomeamt;
if(designation=="Developer")
{
takehomeamt = salary+salary*0.15; //15 % Raise in Salary
}
else
{
takehomeamt = salary+salary*0.10; //10 % Raise in Salary
}
return takehomeamt;
}
public native String sayHello();
}

I added native method sayHello() in Java bean.

While using it in JSP

the code is

<%@ page import = "BeanDir.mysimplebean" %>

<jsp:useBean
id="mybeanid"
class="BeanDir.mysimplebean"
scope="session"/>

<jsp:setProperty
name="mybeanid"
property="*"/>

<html>
<head><title>JSP - Java Bean Demo : James Smith : </title></head>
<body bgcolor="white">

<center>Simple JSP with JAVA Beans Demo Application Form

<%
//Auto Compiled by JSP Engine dont use Javac
//No Parameters Passed into Bean
//cd E:/tomcat/webapps/examples/jsp/testdir/testme2.jsp

String ceoname_ret;
ceoname_ret=mybeanid.getceoname();
out.println(" CEO Name : "+ceoname_ret);

//No Parameters Passed into Bean
String ceoemail_ret;
ceoemail_ret=mybeanid.ceoemail();
out.println(" CEO Email : "+ceoemail_ret);

out.println(" ");
out.println("<table border=1 bordercolor='maroon' cellspacing=4 cellpadding=4 align=center>");
out.println("<tr align=center valign=middle>");
out.println("<td bgcolor=maroon> Calling From JSP </td>");
out.println("<td bgcolor=maroon> BEAN BEANING CALLED </td></tr>");
double takehomeamt_ret;
double totalcost=0;
takehomeamt_ret = mybeanid.findtakehome(5000,"Developer") ;
totalcost=totalcost+takehomeamt_ret;
out.println("<tr align=center valign=middle><td>Take Home : James Smith </td>");
out.println("<td>"+takehomeamt_ret+"</td></tr>");

takehomeamt_ret = mybeanid.findtakehome(5000,"Designer") ;
totalcost=totalcost+takehomeamt_ret;
out.println("<tr align=center valign=middle><td>Take Home : Andrew </td>");
out.println("<td> "+takehomeamt_ret+"</td></tr>");

takehomeamt_ret = mybeanid.findtakehome(7000,"Developer") ;
totalcost=totalcost+takehomeamt_ret;
out.println("<tr align=center valign=middle><td>Take Home : Peter O Neal </td>");
out.println("<td> "+takehomeamt_ret+"</td></tr>");
out.println("<tr align=center valign=middle><td>TOTAL COST FOR COMPANY </td>");
out.println("<td> "+totalcost+"</td></tr>");
out.println("</table>");
String s=mybeanid.sayHello();
out.println("<h1>"+s+"</h1>");
%> </center>

</body>
</html>

The error which i am getting is :
====================

HTTP Status 500 -

type Exception report

message

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

exception

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.UnsatisfiedLinkError: BeanDir.mysimplebean.sayHello()Ljava/lang/String;
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: java.lang.UnsatisfiedLinkError: BeanDir.mysimplebean.sayHello()Ljava/lang/String;
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
org.apache.jsp.jsp.callbean_jsp._jspService(callbean_jsp.java:124)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.UnsatisfiedLinkError: BeanDir.mysimplebean.sayHello()Ljava/lang/String;
BeanDir.mysimplebean.sayHello(Native Method)
org.apache.jsp.jsp.callbean_jsp._jspService(callbean_jsp.java:112)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
Apache Tomcat/6.0.20

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