The plan looks fine to me, so could you double check whether WEB-INF/libs is a typo error or not ? 
The simple way to verify it is, just print the classLoader of a class belongs to the filtered list.

2011/7/12 ashwin nair <matrixnair@gmail.com>
The following is the deployment plan I am using.  I am guessing that somehow
this is not being honored, may be because of the config.ser for this module
in the GERONIMO_REPOSITORY/path/to/ear/META-INF/config.ser.  Is there a way
to ensure that the values are not getting picked up from there?

<application xmlns="http://geronimo.apache.org/xml/ns/j2ee/application-2.0"
xmlns:dep="http://geronimo.apache.org/xml/ns/deployment-1.2">
  <dep:environment>
     <dep:moduleId>
        <dep:groupId>Ebay</dep:groupId>
        <dep:artifactId>XXXXX</dep:artifactId>
        <dep:version>1.0</dep:version>
     </dep:moduleId>
     <dep:dependencies>
        <dep:dependency>
           <dep:groupId>org.apache.geronimo.configs</dep:groupId>
           <dep:artifactId>tomcat6</dep:artifactId>
           <dep:type>car</dep:type>
        </dep:dependency>
        <dep:dependency>
           <dep:groupId>org.apache.geronimo.configs</dep:groupId>
           <dep:artifactId>sharedlib</dep:artifactId>
           <dep:type>car</dep:type>
        </dep:dependency>
     </dep:dependencies>
     <dep:hidden-classes>
         <dep:filter>com.thoughtworks.xstream</dep:filter>
         <dep:filter>org.codehaus.jettison</dep:filter>
     </dep:hidden-classes>
  </dep:environment>
  <module>
     <web>cmosprovsvc</web>
     <web-app
xmlns="http://geronimo.apache.org/xml/ns/j2ee/web/tomcat-1.1">
         <dep:environment>
            <dep:hidden-classes>
               <dep:filter>com.thoughtworks.xstream</dep:filter>
               <dep:filter>org.codehaus.jettison</dep:filter>
            </dep:hidden-classes>
        </dep:environment>
     </web-app>
  </module>


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Ivan