Your best bet for understanding multithreading issues is to get a good understanding of the JVM.
On 6/8/05, Michael Pasko <[EMAIL PROTECTED]> wrote: > Thanks Chuck, that was exactly the problem. I was under the very poor > assumption that a new thread and newly instantiated servlet object was > created every time a request was made, instead of all threads working on > only one instance of an object. To mimic the desired behavior I've fixed > the problem by adding this (implements SingleThreadModel)... > > public class ServletName implements SingleThreadModel > > Now it would seem that if several 100 people were to access a servlet that > every time the following code was hit by a new thread: > > PrintWriter out = response.getWriter(); > > It would direct all output (using out.println()) from all threads to the > most recent person to access the servlet. > > Follow up question: With this in mind, what is the most common method of > writing thread safe code? > > Thank you very much for your help. > > -Mike > > -----Original Message----- > From: Caldarale, Charles R [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 07, 2005 1:15 PM > To: Tomcat Users List > Subject: RE: Servlet Concurrency Issues > > > From: Michael Pasko [mailto:[EMAIL PROTECTED] > > Subject: Servlet Concurrency Issues > > > > I started allowing other users on it, I stumbled on some problems. > > Basically what happens, when user A submits the form, and then 2 > > seconds later user B submits the same form. User A stops getting > > results, and User B receives the output for his request as well as > > the end of User A's request. > > Probably not a configuration problem but rather implementation errors in > your servlet or some related object (such as the DB connection). > There's normally only one copy of the servlet object, and it will be > used concurrently by multiple threads. Make sure you're not storing > request-specific information in there. > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you > received this in error, please contact the sender and delete the e-mail > and its attachments from all computers. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- "You can lead a horse to water but you cannot make it float on its back." ~Dakota Jack~ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
