I'm storing an object in the session using session.setAttribute() and then accessing it again on other pages, as you do. <p> This works fine most of the time, and always in the development environment. However at sometimes when the live web server is busy this session object seems to dissapear from the session. Its not a problem of the session timing out early as users remain logged in - its just that this particular object is lost. The object that I'm storing in the session generally contains quite as lot of data. <p> We're running Tomcat / Weblogic. <p> Any ideas or experiences of similar problems?