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https://issues.apache.org/jira/browse/WICKET-4550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272211#comment-13272211
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Martin Grigorov commented on WICKET-4550:
-----------------------------------------

The reason is explained in WICKET-4334 - static resources do not need sessionid.
Only temporary Wicket sessions are created which are discarded at the end of 
the request. No http sessions are created.
                
> jsessionid is not added to resources if cookies are disabled by the server
> --------------------------------------------------------------------------
>
>                 Key: WICKET-4550
>                 URL: https://issues.apache.org/jira/browse/WICKET-4550
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.5.5
>            Reporter: Michael Bruns
>         Attachments: jsessionid-quickstart.tar.gz
>
>
> When I configure the container (either Jetty or Tomcat) to not support 
> cookies, I expect the jsessionid to be added to all resource links in the 
> page. However, with Wicket 1.5.5 this isn't the case, i.e. all URLs are 
> lacking the jsessionid, both in development and deployment mode.
> Example IS:
> <script type="text/javascript" 
> src="wicket/resource/org.apache.wicket.markup.html.WicketEventReference/wicket-event-ver-1331911540000.js"></script>
> Example SHOULD:
> <script type="text/javascript" 
> src="wicket/resource/org.apache.wicket.markup.html.WicketEventReference/wicket-event-ver-1331911540000.js;jsessionid=${something}"></script>
> This creates a new session for each and every resource in the page, which is 
> an undesirable behavior. I have found a few issues regarding this topic, e.g. 
> WICKET-4334 and WICKET-4312, but none of them could give me a clue about why 
> it doesn't work the way I expect it. In Wicket 1.4.x the jsessionid was added 
> to all resource links, so everything worked fine and the current session was 
> reused.
> I created a quickstart do demonstrate the behavior - please see the attached 
> file. The file jetty-web.xml tells Jetty to not support cookies, so mvn 
> jetty:run can be run without any further configuration.
> By the way, I found a suggestion to use a custom IResourceCachingStrategy to 
> append the jsessionid (or whatever) to URLs of resources in the archive of 
> the mailinglist. Unfortunately, this doesn't work because the URL is encoded 
> afterwards and the ; is turned into %3B.

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