Session TimeOut in web xml

Question

I am trying to understand the real purpose of session configuration in Web xml for session timeout    lt  -- Session Configuration -- gt   lt session-config gt           lt session-timeout gt 60 lt  session-timeout gt   lt  session-config gt    Now let me tell you about my question   My application is importing uploading a  txt file  which is bound to take more than 1 hour  since there are millions of records to be imported  But the session times out after 1 hour though my application is still importing that  txt file which is in progress  Such an application should not timeout as the application is doing some task in the background

User · Answer

lt session-config gt       lt session-timeout gt -1 lt  session-timeout gt   lt  session-config gt    You can use  -1  where the session never expires  Since you do not know how much time it will take for the thread to complete

User · Answer

Another option I would recommend is to create a separate application that is stateless that would take the large file   On your main app open a new window or iframe that will accept the file and send it through that window then hide the window or iframe once the upload has started using Javascript

User · Answer

You should consider splitting the large file to chunks and rely on multi threading capabilities to process more than one file at a time  OR  let the whole process run as a background task using TimerTask and write another query to know the status of it form the browser including a progress bar can be shown if you can know the process time of a file or record

User · Answer

Hacky way   You could increase the session timeout programmatically when a large up- download is expected   session setMaxInactiveInterval TWO HOURS IN SECONDS    When the process ends  you could set the timeout back to its default   But   when you are on Java EE  and the up- download doesn t take a complete hour  the better way was to run the tasks asynchronous  via JMS e g

User · Answer

Send AJAX Http Requests to the server periodically  say once for every 60 seconds  through javascript to maintain session with the server until the file upload gets completed

User · Answer

lt session-config gt           lt session-timeout gt -1 lt  session-timeout gt   lt  session-config gt    In the above code  60  stands for the minutes  The session will expired after 60 minutes  So if you want to more time  For Example -1 that is described your session never expires

User · Answer

To set a session-timeout that never expires is not desirable because you would be reliable on the user to push the logout-button every time he s finished to prevent your server of too much load  depending on the amount of users and the hardware   Additionaly there are some security issues you might run into you would rather avoid     The reason why the session gets invalidated while the server is still working on a task is because there is no communication between client-side  users browser  and server-side through e g  a http-request  Therefore the server can t know about the users state  thinks he s idling and invalidates the session after the time set in your web xml     To get around this you have several possibilities      You could ping your backend while the task is running to touch the session and prevent it from being expired increase the  lt session-timeout gt  inside the server but I wouldn t recommend this run your task in a dedicated thread which touches  extends  the session while working or notifies the user when the thread has finished     There was a similar question asked  maybe you can adapt parts of this solution in your project  Have a look at this     Hope this helps  have Fun

User · Answer

The docs says      The session-timeout element defines the default session timeout interval for all sessions created in this web application  The specified timeout must be expressed in a whole number of minutes  If the timeout is 0 or less  the container ensures the default behaviour of sessions is never to time out  If this element is not specified  the container must set its default timeout period

User · Answer

you can declare time in two ways for this problem    1  either give too long time that your file reading is complete in between that time    lt session-config gt       lt session-timeout gt  1000  lt  session-timeout gt   lt  session-config gt    2 declare time which is never expires your session    lt session-config gt       lt session-timeout gt -1 lt  session-timeout gt   lt  session-config gt

User · Answer

If you don t want a timeout happening for some purpose    lt session-config gt       lt session-timeout gt 0 lt  session-timeout gt   lt  session-config gt    Should result in no timeout at all -  infinite

User · Answer

Usually the session will not expire when request processing is happening  I think there is an LB or something in between which reads the entire file and then invokes the web container   This might be causing a delay which is leading to expiry of the session

User · Answer

You can see many options as answer for your question  however you can use  -1  where the session never expires  Since you do not know how much time it will take for the thread to complete  E g        lt session-config gt           lt session-timeout gt -1 lt  session-timeout gt       lt  session-config gt    Or if you don t want a timeout happening for some purpose    lt session-config gt       lt session-timeout gt 0 lt  session-timeout gt   lt  session-config gt    Another option could be increase the number to 1000  etc  etc  bla  bla  bla   But if you really want to stop and you consider that is unnecessary for your application to force the user to logout  just add a logout button and the user will decide when to leave   Here is what you can do to solve the problem if you do not need to force to logout  and in you are loading files that could take time base on server and your computer speed and the size of the file    lt  -- sets the default session timeout to 60 minutes  -- gt      lt  --  lt session-config gt        lt session-timeout gt 60 lt  session-timeout gt      lt  session-config gt  -- gt    Just comment it or deleted that s it  Tan tararantan  tan tan

[java] Session TimeOut in web.xml

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