session - How to measure HttpSession size accurately and effectively -

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is there easy, effective , accurate way measure session size in servlet based application? preferably measuring method should application server/container independent.
tried measuring session size lambda probe on tomcat 7, seemed me quiet inaccurate, slow , buggy. think there should easy straightforward way, because every decent java ee developer cares session size.

i want stress test application , measure session bloat.

this how calculate size of session in application itself:

totalsize = 0; totalserializable = 0; totalnumber = 0;  httpsession session = getsession(); enumeration<string> attrs = session.getattributenames(); while (attrs.hasmoreelements()) {     string attr = attrs.nextelement();     sessionobject sobj = new sessionobject(attr, session.getattribute(attr));     sessionattributes.add(sobj);     if (sobj.isserializable()) {         totalsize += sobj.getsize();         totalserializable++;     }     totalnumber++; }

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