Does calling session.invalidate() also removes all the session attriutes?

Hi,
I want to know whether calling session.invalidate() also removes any objects in the session attributes.or we have to explicitly remove objects from the attributes.
I want to know this because my application is having some memory related problems. In my application when a user logs in we put many String objects int the session using session.setAttribute.
Now when the user logs out we call session.invalidate() .
Will these String objects occupy memory (i.e. will they be garbage collected ) after I call session.invalidate() ?
or
I have to explicitly remove all the session attributes programmatically?
Any assistance would be of great help.
Thanks & Regards,
Nirmal

Sigh. The invalidate dereferences all attributes from the current session. If the object doesn't have any other references (servlets? filters? listeners? whatever) then it will be eligible for GC. The object i.e the String objects does'nt have any remaining references after I nullified the arrayList (which was the one and only refeferencing the String Objects).
There isn't any servlet, filter, no other entity that is referencing the arraylist once the user's session is invalidated.
But still when I take the heap dump I'm gettingt those String objects in the heap.........
Once a user logs off we call his/her session.invalidate() and we don't want any of his/her arrayList (containing String objects) in the memory anymore.
Please tell me according to you what should be done in order to get rid of the unwanted String objects in the heap, beside my silly lines of code.
I've load tested the application using jmeter (say for 100 users) and for each of the users the String objects(contained in ArrayLIst) stored in the session are still available even though we called session.invalidate() for each of the user.
This is a major concern for memory related problems that we people are facing here.
Any help would be of great ......
Thanks & Regards,
Nirmal

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