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Session Counter Locking Question

A Phatak
Greenhorn

Joined: Sep 22, 2011
Posts: 24
I keep having some trouble understanding synchronizing concept in the context of static vs nonstatic. For e.g. take a look at the code below:


It is a simple listener that counts number of active sessions. However, we know HttpSession object is not thread safe. So I believe that "counter" variable should be incremented in a "synchronized" manner.

It is clear that getCounter() should change to public synchronized static int getSessionCounter()

My question is what changes should be implemented in sessionDestroyed() and sessionCreated() methods? Which of the following is correct?



OR




Or does it have to be synchronized at all?

ocpjp 6 (86%)
 
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subject: Session Counter Locking Question