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As long as you have a reference to the session object it will not be grabage collected<br />
and the reference is still valid.<br />
But perhaps it will throw some exception if you want to access it.<br />
If you use WeakReference for storing the reference to the session it will be garbag<br />
collected and you will be able to track this with ReferenceQueue.
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As long as you have a reference to the session object it will not be grabage collected
and the reference is still valid.
But perhaps it will throw some exception if you want to access it.
If you use WeakReference for storing the reference to the session it will be garbag
collected and you will be able to track this with ReferenceQueue.

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Could you please explain more about WeakReference? 
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Could you please explain more about WeakReference?

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I have a servlet class, which has a static hashtable. Whenever each request comes, i put the Httpsession reference in the hashtable. Under certain circumstances, I would make use of the Httpsession references to invalidate some session. <br />
<br />
My question is, after the session timeout period, will the Httpsession reference be garbage collected? If so, then will the HttpSession reference be null? Or I will access some 'forbidden' area of the memory?
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I have a servlet class, which has a static hashtable. Whenever each request comes, i put the Httpsession reference in the hashtable. Under certain circumstances, I would make use of the Httpsession references to invalidate some session. 

My question is, after the session timeout period, will the Httpsession reference be garbage collected? If so, then will the HttpSession reference be null? Or I will access some 'forbidden' area of the memory?

Using Httpsession reference after session-timout?

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