Overriding subset of interceptor params

[Jon Wilmoth]

I'm trying to override one of three interceptor parameters in an action 
specific config using method #2 described in 
http://struts.apache.org/2.0.11.1/docs/interceptors.html#Interceptors-InterceptorParameterOverriding.
  Unfortunately the other two parameters that I'm not overriding are not being 
taken from the default stack definition and are ending up as null on the 
interceptor.  Before I open a Jira bug (or enhancement request), I thought I'd 
make sure a) this isn't user error b) the expected behavior is "my" expected 
behavior (i.e. bug vs. enhancement).  Below is a sample action config showing 
what I'm attempting...
 
<package name="packageA"...>
    <interceptors>
        <interceptor name="myInterceptor" class="..."/>
        <interceptor-stack name="myStack">
            <interceptor-ref name="defaultStack"/>            
            <interceptor-ref name="myInterceptor">
                <param name="paramA">defaultValueA</param>
                <param name="paramB">defaultValueB</param>
                <param name="paramC">defaultValueC</param>
            </interceptor-ref>
        </interceptor-stack>
</package>
 
With the following action config, the "myInterceptor" interceptor's  paramA & 
paramB are null and not "defaultValueA" and "defaultValueB" as expected/desired.
 
<package name="packageB" extends="packageA"...>
    <action name="myAction" class="myActionClass">
        <interceptor-ref name="myStack">
            <param name="myInterceptor.paramC">actionSpecificValue</param>
        </interceptor-ref>
    </action>
</package>
 
Thanks,
Jon