> From: Carol Cheung [mailto:[EMAIL PROTECTED]
> Subject: RE: NoClassDefFoundError: org.apache.catalina.realm.RealmBase
>
> Sorry, I'm using Tomcat 5.5. I removed catalina.jar from
> WEB-INF/lib and I am still getting the same error.

Look at the Tomcat 5.5 classloader structure:

      Bootstrap
          |
       System
          |
       Common
      /      \
 Catalina   Shared
             /   \
        Webapp1  Webapp2 ...

The 5.5 Realm doc says:
* Place your compiled realm in $CATALINA_HOME/server/lib
(which is Catalina in the above diagram).

However, if you do that, your Realm class(es) will not be visible to code in 
your webapp.  You'll need to put your Realm in common/lib (or common/classes, 
if not jar'd) to let both Tomcat and your webapp have access to your code.

BTW, it's easier in 6.0 due to the simplified classloader structure.

 - Chuck


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