I have my Java Servlets under /local/tomcat/webapps/hari/WEB-INF/classes

My Java Servlets use Oreilly's predefined classes and I use that so as not to reinvent the wheel.
Oreliiy's classses are avaliable as "cos.jar" file and when I unjar them I get following structure
com/oreilly/servlet/*.classes

I have stored this cos.jar file under "/local/tomcat/webapps/hari/WEB-INF/lib/" and "/local/tomcat/webapps/lib/" and have these on my CLASSPATH.

In my Java Servlets, I do following import
-------------------------------------------------
import com.oreilly.servlet.MultipartRequest;
import com.oreilly.servlet.*;
-------------------------------------------------

It compiles everything fine BUT when I run my WEB APPLICATION (http://us.hari.com/hari/BatchUpload1) it gives my following ERRORS wonder why...
--------------------------------------------------------------------------------
description: The server encountered an internal error () that prevented
it from fulfilling this request.
exception

javax.servlet.ServletException: Error instantiating servlet class
util.BatchUpload1
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:865)
....
root cause

java.lang.NoClassDefFoundError:
com/oreilly/servlet/multipart/FileRenamePolicy
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1618)
at java.lang.Class.getConstructor0(Class.java:1930)
at java.lang.Class.newInstance0(Class.java:278)
at java.lang.Class.newInstance(Class.java:261)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:856)
-----------------------------------------------------------------------------------

Can anyone point what is wrong here.,..

Sincerely,

KISNA