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Doubt in Filters HFSJ

Posts: 22
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5th question in page 703 of HFSJ is as follows:

Which about the filters are true?

Here are the answers given:
A.Filters may be used to create request or response wrappers
G.Filter's doFilter() may block further request processing.

My doubts:
How option A is correct?
Filters can use request or response wrappers to modify the request or response sent to/from servlet. But how Filters are used to create wrappers?

Why Option " D.Filters support an initialization mechanism that includes an init() method that is guaranteed to be called before the filter is used to handle the requests " is INCorrect??

Thanks & Regards,
pie sneak
Posts: 4727
Mac VI Editor Ruby
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For A, the Filter API does not include anything for creating wrappers, but in a filter is where a developer will typically create and utilize wrappers. If you want to wrap a request or response, a filter is the place to do so.

For D, you ought to check the errata. It says that option D should be checked.
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