Hey all, When my JSP session times out, I'm seeing an unexpected phenomenom. The session variable still exists, I can call getId() and the correct formerly valid session id is returned, but all the attributes stored in the session get wiped away. So, I wanted to monitor when these attributes get blown away so I could do something (like manually invalidate the session or something). I created an object that implemented the HttpSessionAttributesListener interface, configured web.xml, and was able to monitor the adding, replacing and removing of session variables. And in general this works, except when the variables are replaced/removed by the session timing out! Anyone know a solution to this?
In case you're wondering the core problem that I'm trying to solve is that of a NullPointerException that gets thrown when a user is logged in, on a JSP page, goes away and the system times the user out, the user comes back and does something like hit a submit button and my servlet (I'm using struts, so it's an Action instance, but for those not familiar, it's just a servlet) gets ahold of the user's session using the standard request.getSession(), tries to retrieve a session variable and viola I get the NullPointerException. I don't want to wrap all my code with try blocks if I don't have to, I simply want my application to go back to the login page if the session has timed out. Any help would be much appreciated, -adamw
