SRV.6.2.2 Wrapping Requests and Responses says
>
> The same requirement of wrapper object identity applies to the case where
> the developer passes a wrapped request or response object into the request
> dispatcher; the request and response objects passed into the servlet
> invoked must be the same objects as were passed in.

Above statement mandates that when forward/include is done using wrappers 
we need to pass same wrapper to the servlet invoked.  The above section 
doesn't clarify whether the rule is applicable only when forward/include 
is done in the same web module or in all the cases.

Tomcat implementation doesn't pass the same wrapper with forward/include
across webmodules.

Ideally we feel that the above statement in the spec should be valid
only with in a webmodule for webmodule isolation reasons. 

If it is applicable across Webmodules then Tomcat implementation needs to be
fixed. Otherwise we would like to see the clarification in Spec.