Interesting software with a grain of salt
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Very interesting software that lets you know the size of http session size. I was going through the doc and it says that I should take the size of the Session with a grain of salt. So, what is the point of having this software?
Object sizing is "only" one of the many benefits of using MessAdmin, and is quite difficult to achieve in Java. You can refer to http://www.javaworld.com/javaqa/2003-12/02-qa-1226-sizeof_p.html for technical details.
In short, don't trust the numbers too much. It's there to give an approximation of memory consumption.
Now, MessAdmin allows you to do much more than computing objects size! You can see exactly what is inside an HttpSession, view all sessions for a webapp as well as related statistics, and send messages to users.