Controlling Sessions in JSP

Hi,
I wonder is it possible to have control over session objects whether in JSP code or via application server configurations.
Controlling means:
+ Memory space used for session objects
+ Maximum space available for session objects
Is it an application-server-relater config or can be simply set or accessed via JSP code?
Thanks in advance.

to what end?
You have to really know what you're putting in the session to know how much memory is used. Generally, you have 2 bytes per char in a string, whatever the primitive types use (1-8 bytes), and 32 bytes for an object (if I recall correctly)... depending on the object data (much of the time it boils down to strings and primitives anyway, it seems). Then you could try adding up what's in the session and keep a count of the usage. But otherwise there's no simple way to keep track of the memory usage.

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