attribute scopes

[cyril vidal]

Hi,
a question extracteed from j2eecertificate.com

Which of the following attribute scopes are thread-safe? [Check all correct answers]


The correct answer is:
1. Request attribute.
2. Response attribute.
3. Session attribute.
4. Context attribute.
5. None of the above.

Feedback:
Answers 1 and 2 are correct. The request attribute and response attribute are thread-safe because the servlet container creates a single HttpServletRequest and a single HttpServletResponse per request. Therefore both attributes are only available for that request and hence cannot be shared by other requests.

To my sense, answer 2 should not be considered as exact here.
It's true that HttpServletResponse object is thread-safe, but HttpServletResponse is not an attribute scope. Or the question asks for atribute scopes...
What do you think? It's difficult to cut it short, isn't it?
Regards,
Cyril.

[Ko Ko Naing]

Yes, cyril vidal... U r right.. Response attribute is not an attribute scope...
And also I'm wondering whether they wanna ask about the object? HttpServletRequest Object, HttpServletResponse Object, HttpSession Object and ServletContext Object...
What do u think?