SingleThreadModel Mock Question

[Gaurav Chikara]

Suppose that Myservlet implements SingleThreadModel.
and there are
Local variables
Instance variables
Class variables
Request attributes
Session attributes
Context attributes
Which among these variables would be thread safe
Select any one
A Local and Request Variables
B Local,Instance and request variables
C Local,Instance,request,class variables
D None of these
I donot know the correct answer but I think it shud be A
Can anyone correct me if I am wrong?

[Sam Cala]

it should be B
When you gonna take the exam, Gaurav ?

[Tong Chen]

Hi,
Can you give a little more explanation?
Thanks,

[Ricardo Cortes]

Local variables will be ridded of by the time the method returns so there's no worrying about other threads.
From the servlet specification (regarding static variables):
"The SingleThreadModel interface does not prevent synchronization problems that results from servlets accessing shared resources such as static class variables or classes outside the scope of the servlet".