javascript - Sending a random token using cookies -

the managed bean :

@named @viewscoped public class bean implements serializable {      private static final long serialversionuid = 1l;      public bean() {}      @postconstruct     public void init() {         cookie cookie = new cookie("token", uuid.randomuuid().tostring());         cookie.setmaxage(-1);         ((httpservletresponse) facescontext.getcurrentinstance().getexternalcontext().getresponse()).addcookie(cookie);     } } 

the cookie named token added response in @postconstruct method.

this cookie attempted accessed javascript follows.

<h:head>     <script type="text/javascript">         var cookie = getcookie("token");         console.log(cookie);          function getcookie(name) {             var matched = document.cookie.match(regexp(name + "=.[^;]*"));              if (matched) {                 return matched[0].split('=')[1];             }              return false;         }     </script> </h:head>  <h:body>     <h:form>         #{bean}     <h:form> </h:body> 

it works fine unless same page opened simultaneously in different tabs and/or windows happens, when link corresponding page clicked several times holding ctrl key in case token shared across different tabs expected unique across tabs and/or windows.

using <f:event type="prerenderview" listener="#{bean.init}">, <f:viewaction action="#{bean.init}"> or servlet filer set cookie little earlier makes no difference.

how make sure cookie value according new generated value in managed bean , not collide, when same page requested , opened in different tabs and/or windows?