Java EE (Java Enterprise Edition) General Discussion

i am writing some programs about ldap

my program code has used some packages as the followings

import org.apache.tomcat.core.*;
import org.apache.tomcat.util.*;
import org.apache.tomcat.util.xml.*;

i am using apache + tomcat4.1 server, jsdk1.4

i have set the classpath that contains all the jar files in $TOMCAT_HOME\common\lib

after setting the classpath, i compiled the code
it said the above packages does not exist

where should i find those packages?
Aren't they in the tomcat i installed?

PLX HELP