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Mock Question about thread-safe
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Nicky Eng
Ranch Hand
Joined: Mar 26, 2005
Posts: 378
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Web .com developers choose to avoid using SingleThreadModel, but wants to ensure data is updated in thread-safe manner.
which 2 support this design goal..? (choose 2)
A. Store the data in the local variable
B. store the data in an instance variable
C. store the data in the ServletContext object
D. Store the data in the ServletRequest object
what's the answer you think???
Store the data in local variable would make sense...then how about another one???
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From NickyEng
Diploma in Computer Studies
SCJP 1.4
SCWCD 1.4
Formula 1 app by Maxis (Playbook)
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Rizwan Mohammad
Ranch Hand
Joined: Sep 02, 2005
Posts: 445
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Only local variables and request scope attributes are thread safe in servlet life cycle.
so my answers are
1)local variables &
2)request scoped attributes
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Rizwan
SCJA, SCJP, SCWCD, SCBCD, SCDJWS.
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Vishnu Prakash
Ranch Hand
Joined: Nov 15, 2004
Posts: 1026
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Thread safe
* local variables
* request attributes
Not Thread safe
* instance variables
* class variables
* session attributes
* context attributes
Hope this is useful 
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Servlet Spec 2.4/ Jsp Spec 2.0/ JSTL Spec 1.1 - JSTL Tag Documentation
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erwin jeffrey
Greenhorn
Joined: Jun 29, 2011
Posts: 10
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are static variables thread safe?
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I agree. Here's the link: jrebel
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subject: Mock Question about thread-safe
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