How much data can session store?

[lei.han@xxxxxxxxxxxxx]

How can I find out the size limit of
session data for my container? 

If I write a cache utitlity, theroetically
it can hold data up to JVM limited size. How about session? If I store
the data in session, what's the limit? And would it substantially affect
performance than storing it in regular cache instead?

Thanks!

Lei Han