what r thread safe variables in jsp

what r thread safe variables in jsp and why in  the below options?

1.request variables
2.session varaibles
3.local variables
4.request,session
5.request,session,local
6.session,local
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chaitu chaituAsked:
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TimYatesCommented:
You mean if you write a multi threaded servlet or something?

1) no
2) no
3) no
4) no
5) no
6) no

Not 100% sure what you mean though... ;-)
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chaitu chaituAuthor Commented:
yes if i write multi threaded servlet which of the variabled are threadsafe?
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TimYatesCommented:
Only the read-only parameters request.getParameter, etc will be thread safe... none of the others are...
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thomas908Commented:
I think local variables (variables u declare within a smethod in a servlet ) will also be thread safe although instance variables aren't.
i'd be better to get it verified though.

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TimYatesCommented:
> I think local variables (variables u declare within a smethod in a servlet ) will also be thread safe although instance variables aren't.

Yep, same as with regular java classes :-)
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