I recently had to find the size of the data stored in the HTTP Session State. On MOS I found this note:
“Session Replication Fails Due To Non-Serializable Object: JSP Test Page [ID 1073386.1]”.
It contains a JSP test page that will show you if your session data is serializable or not. It will also calculate the size of the data. It’s very simple you just download the JSP file and deploy it with your application. Nice!
Here is an example of the output.Google+