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helmers (7) [Avatar] Offline
2nd edition, Section 4.8.3: : Accessing request-scoped attributes with RequestDispatcher.

P.59, NOTE:
These attributes can't be set if the RequestDispatcher was obtained with the getNamedDispatcher() method.

I thought this book was aimed at Servlet programmers, not at Servlet container programmers. So it should say something like:

These attributes are not set if ...
These attributes are not available if ...

(See also specs SRV 8.3: If the included servlet was obtained by using the getNamedDispatcher method, these attributes must not be set.)

Also I think the question marks around the getAttribute() argument should be quotes ".

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