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how sessions are implemented on server

 
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Hi All,

Can anyone please tell me how sessions are implemented on server like JRun, WebLogic, WebSphere or in general ?

Thanks & Regards,
Kumar.
 
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A session (HttpSession) is a kind of collection object whose life cycle is managed by the servlet container. It consists of a collection (think Map) that holds Object references indexed by String keys, plus a bunch of bookkeeping variables that let it track the time of last access, send events to listeners, etc..
If the objects you add to a session are serializable, the servlet container will be able to write them out to disk to save memory.
If you want to dig into the detains, look at the source code for Tomcat.
Bill
 
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Read this article for a description of how we did shared sessions in WebSphere's earlier versions. Newer versions have more options and optimizations, but it's basically the same.

Kyle
 
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