Tomcat wraps HttpSession objects underlying maps using java.util.Collections.synchronizedMap. There was a previous issue in a version of Tomcat 5.0.x something in which this was changed, and it raised a stink, so it was fixed again. It had to be put back to use synchronized as the concurrency issues caused such headaches the developer had no way to manage this from an application perspective. I can't imagine Tomcat would have calls which are not synchronized to pull a session back from storage either. The user certainly would not have any control over such a thing as JSP session access can not be wrapped easily by developers using normal synchronization techniques. Are you having some specific issue?
Wade --- lightbulb432 <[EMAIL PROTECTED]> wrote: > > I'm reading some book concurrency books that talk > about potential thread > safety issues with HttpSession. Specific cases > follow: > > - When the web container passivates an HttpSession > while a user's request > modifies it > - When the web container replicates an HttpSession > while a user's request > modifies it > - When multiple quick, successive requests from the > same user access the > same HttpSession > > Could somebody explain how Tomcat deals with the > first two, and what steps > web application developers need to take to avoid > concurrency problems with > all three cases above? Is it guaranteed that the > passivated/replicated > object is always a consistent view of the > HttpSession? > > Thanks. > -- > View this message in context: > http://www.nabble.com/Concurrency-with-HttpSession-tf4403264.html#a12561600 > Sent from the Tomcat - User mailing list archive at > Nabble.com. > > > --------------------------------------------------------------------- > To start a new topic, e-mail: > users@tomcat.apache.org > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
