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Some errors with my ActiveSessions counter  RSS feed

 
Jenkin Zheng
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Hi, everyone! I want to count active sessions on server. So I implement javax.servlet.http.HttpSessionListener, Here is a part code of SessionCounter
Here is my test the counter code:
Sometimes, the result is not right, like:[null]active sessions on server.
Why does it show null?I'm a newer!
thanks, everyone!
 
Piyush Joshi
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may be because you are printing it too early..
print it after the if/else block after you set the attribute in your code..
 
syed aq
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Donot use listener, in rare cases listeners are not fired
 
Piyush Joshi
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syed aq wrote:Donot use listener, in rare cases listeners are not fired

Can you please explain what are the cases when listeners will not be fired. (except when the server crashes)
 
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