I've a strange problem with my web application:
- I have a JSP page wich shows some data, and this is ok
- then from this main JSP page I launch a popup window (opened with window.showModalDialog()) and "sometimes" I get the following exception
java.lang.IllegalStateException: getAttribute: Session already invalidated
when I say "sometimes" it means that If I restart the server then the error "may" not occur, but when it happens I get this error for every popup window opened from every client.
- then if I close the popup (which is empty because of the error) and I use the main JSP page then everything is ok, so the session is still alive.
I tried to sniff the HTTP calls and the exchanged JSESSIONID is correct.
My browser is Internet Explorer 6.0 SP2, the server is JBoss+Tomcat (error occurs with versions 4.X and 5.X of Tomcat).