How to stop refreshing from increasing a session variable in a java servlet










0















So i'm keeping a count on some pictures a user can visit, i want to make sure though that if they click refresh it does not increase the number of counts for that picture. The below code is causing my server to crash, and respond back with an error code 500.



 HttpSession session = request.getSession() ;
Integer counter = (Integer) session.getAttribute("counter");
String accCount = (String) session.getAttribute("attributeKey") ;

if (accCount == null) // New session?
response.sendRedirect("/techfore/WelcomePage");



if(counter == 0)


counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);










share|improve this question






















  • to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

    – Scary Wombat
    Nov 14 '18 at 1:06











  • Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

    – user10463530
    Nov 14 '18 at 1:07















0















So i'm keeping a count on some pictures a user can visit, i want to make sure though that if they click refresh it does not increase the number of counts for that picture. The below code is causing my server to crash, and respond back with an error code 500.



 HttpSession session = request.getSession() ;
Integer counter = (Integer) session.getAttribute("counter");
String accCount = (String) session.getAttribute("attributeKey") ;

if (accCount == null) // New session?
response.sendRedirect("/techfore/WelcomePage");



if(counter == 0)


counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);










share|improve this question






















  • to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

    – Scary Wombat
    Nov 14 '18 at 1:06











  • Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

    – user10463530
    Nov 14 '18 at 1:07













0












0








0








So i'm keeping a count on some pictures a user can visit, i want to make sure though that if they click refresh it does not increase the number of counts for that picture. The below code is causing my server to crash, and respond back with an error code 500.



 HttpSession session = request.getSession() ;
Integer counter = (Integer) session.getAttribute("counter");
String accCount = (String) session.getAttribute("attributeKey") ;

if (accCount == null) // New session?
response.sendRedirect("/techfore/WelcomePage");



if(counter == 0)


counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);










share|improve this question














So i'm keeping a count on some pictures a user can visit, i want to make sure though that if they click refresh it does not increase the number of counts for that picture. The below code is causing my server to crash, and respond back with an error code 500.



 HttpSession session = request.getSession() ;
Integer counter = (Integer) session.getAttribute("counter");
String accCount = (String) session.getAttribute("attributeKey") ;

if (accCount == null) // New session?
response.sendRedirect("/techfore/WelcomePage");



if(counter == 0)


counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);







java






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 14 '18 at 1:03







user10463530



















  • to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

    – Scary Wombat
    Nov 14 '18 at 1:06











  • Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

    – user10463530
    Nov 14 '18 at 1:07

















  • to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

    – Scary Wombat
    Nov 14 '18 at 1:06











  • Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

    – user10463530
    Nov 14 '18 at 1:07
















to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

– Scary Wombat
Nov 14 '18 at 1:06





to test for a new session why not use docs.oracle.com/javaee/5/api/javax/servlet/http/…

– Scary Wombat
Nov 14 '18 at 1:06













Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

– user10463530
Nov 14 '18 at 1:07





Oh awesome. I never knew about that just started a course on java servlets so i'm a bit new to this.

– user10463530
Nov 14 '18 at 1:07












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