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distributed web application

 
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I came across this question in a practice exam.
Which of the following apply to a web application that is distributed across multiple Java Virtual Machines?
You answered: D

A HttpSessionActivationListener needs to be implemented.
B HttpSessionMigrationListener needs to be implemented.
C Web application cannot be distributed across multiple Java Virtual
Machines.
D No precautions are required
A is correct. HttpSessionActivationListener needs to be implemented.

I did not think the you HAD to implement HttpSessionActivationListener.
Could someone please confirm this.
 
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You're right Ryan, I agree. It doesn't *need* to be implemented.
My answer is D too.
 
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