Tomcat-4.0.2 can not locate Java Class

I have an application which runs fine under Tomcat-3.x. Now I am trying to run under Tomcat-4.0.2, right after I login to my application (As you can see the new Tomcat does find my application's index.html fine), I got an error:
Apache Tomcat/4.0.2 - HTTP Status 500 - Internal Server Error
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred between lines: 8 and 13 in the jsp file: /login.jsp
Generated servlet error:
C:\jakarta-tomcat-4.0.2\work\localhost\adms\login$jsp.java:80: Undefined variable or class name: Utility
boolean auth=Utility.ldapAuthenticate(userEmail,password);
It looks Tomcat can not find the Utility class, even though it is under usual place: WEB-INF/classes.
Now, I even copies all the directory structures into $CATALINA_HOME\webapps, still no luck.
I am running on W2K.
Can anyone shed me some light? Thanks.

Oh! I can do it now.
Just import the class you want...
<%@page import="Utilities" %>
and put that class in WEB-INF/classes

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