in my server.xml file i have this Realm configuration:

<Realm className="org.apache.catalina.realm.JNDIRealm " debug="99"
      connectionURL="ldap://10.0.10.60:389"
      referrals="follow"
      userBase="cn=Users,dc=eystest,dc=local"
      userSearch="(sAMAccountName={0})"
      userSubtree="true"
      userRoleName="Users"
      roleBase="cn=Users,dc=eystest,dc=local"
      roleSearch="(sAMAccountName={0})"
      roleSubtree="true"
      rolename="cn" />

but when try to run the tomcat server i got this exception:

Sep 6, 2006 1:46:50 PM org.apache.tomcat.util.digester.Digester
startElement
SEVERE: Begin event threw exception
java.lang.ClassNotFoundException: org.apache.catalina.realm.JNDIRealm
       at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

i can't find the org.apache.catalina.realm.JNDIRealm class.

can any one help this dumber.!!. thanks in advance.