Java.lang.NoClassDefFoundError when trying to create JNI Java object

Question

Can anyone give some clue for the following errors:
//// JSP code:
<%
UIAccessCheckNat access = new UIAccessCheckNat();
int nbrwdSifd = access.checkNbrwsSfid();
%>
//// Java code:
UIAccessCheckNat.java
package test.JS;
public class UIAccessCheckNat
public UIAccessCheckNat()
//Empty constructor
// this method check if NBRWS is turned on
public int checkNbrws()
int rc = 0;
return rc;
// Load native library.
static
System.loadLibrary("UIAccessCheckNat");
////The JNI c library code:
#include <string.h>
#include <stdio.h>
#include <jni.h>
#include "UIAccessCheckNat.h"
/*ARGSUSED*/
JNIEXPORT jint JNICALL Java_test_JS_UIAccessCheckNat_nativeCheck
(JNIEnv * env, jobject jthis, jint id)
jint rc=1;
return rc;
Testing result:
1. Sunny day case, everything is OK if don't load the library (comment the following line and recompile the java class)
// Load native library.
// static
// System.loadLibrary("UIAccessCheckNat");
2. Rainy day case: wen put the above lines in the java class and recompile the Java class and load the JSP again, it cause error as following:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException
     at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
     at org.apache.jsp.Login_jsp._jspService(Login_jsp.java:434)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NoClassDefFoundError
     at org.apache.jsp.Login_jsp._jspService(Login_jsp.java:96)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
I am using Apache Tomcat/5.0.18 as servlet container.
Can anyone plesae help?
Thanks

Answer 1

I would normally do:
<jsp:useBean id="access" scope="session" class="YourPackageName.UIAccessCheckNat()" />
Then int nbrwdSifd = access.checkNbrwsSfid(); should work
You MUST put your class into a package:
Tomcat 5.0\webapps\yourApplication\WEB-INF\classes\YourPackageName