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http://issues.apache.org/bugzilla/show_bug.cgi?id=30028 session attributes Map may become inconsistent start causing "strange" problems ------- Additional Comments From [EMAIL PROTECTED] 2004-07-11 23:44 ------- Remy, <quote> SRV.7.7.1 Threading Issues Multiple servlets executing request threads may have active access to a single session object at the same time. The Developer has the responsibility for synchronizing access to session resources as appropriate. </quote> I wouldnt say this implies that HttpSession is not guaranteed to be thread-safe and to be fair it is quite ambiguous about either. As to my interpretation the spec is talking about objects that are stored in session. And it would be logical because the container cannot possibly synchronize access to them. The session itself is a different matter altogether. It is a container resource and I dont think it would qualify as a "session resource" the spec is going on about. I would say that the container have to synchronize calls to setAttribute/removeAttribute to ensure session consistency. Performance difference between HashMap and the synchronized map is negligible and the advantages are obvious. Basically unless session is accessed by the single servlet implementing SingleThreadModel there is no way to gurantee session connsistency? Even <jsp:useBean> does not synchronize against the session. So everyone is a winner if StandardSession.attributes is synchronized? I do hope that what i said here makes sense because Tomcat is one of the few servers that doesnt care about setAttribute/removeAttribute thread safety, which is a shame. Regards, Vlad --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
