load dynamic library in jsp

[j.du]

hi,
there is a error when i trying to call a jni dynamic library within my
jsp.
in this case, it is enough to only load dynamic library "shtest.so" or
have to load other java class relate to it? if so, which classes
should also be loaded?
the origion function is written in C++(shtest.cxx), the dynamic
library is generated by swig.
any "da xia" have any idea about it? thanks in advance!

jasper

envir: Tomcat jdk1.4 jwsdp1.2


below is my code and error message:

##interface file
%module adder

%{
#include "shtest.h"
%}

%include "shtest.h"

## c++ file
int add( int a, int b )
{
return( a + b );
}

## header file
int add( int a, int b );


##jsp file:
....
<%! public native int add( int i, int j );
%>
<%
// here must load both the dynamic library and the "adder" class.
System.loadLibrary("shtest");
getClass().getClassLoader().loadClass("adder");
//loadclassandlib y = new loadclassandlib();
//adder ADDER = new adder();
%>
<%= adder.add(20,10) %>
....


java.lang.UnsatisfiedLinkError: add
at test.adderJNI.add(Native Method)
at test.adder.add(Unknown Source)
at org.apache.jsp.steer_jsp._jspService(steer_jsp.java:106)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:320)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:293)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:288)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:196)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2748)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:186)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:512)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:199)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:637)