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https://issues.apache.org/jira/browse/JS2-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465971
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Eivinn Hustveit commented on JS2-558:
-------------------------------------

I think we finally have found out what causes this issue. It is the use of the 
User-Agent switcher plug-in in Mozilla Firefox. We are developing services for 
the mobile phone web-browsers and "emulate" this software using this plugin. 
After setting user-agent to some phone and entering our Jetspeed portal this 
NULL message comes up. If one switches back to default (UA=Mozilla...) it all 
works perfectly.

I assume the best fix would be to support all User-Agents and preferably return 
a default site if no mode exist for the given UA.

> Only "NULL" is shown in browser at what seems to be random intervals.
> ---------------------------------------------------------------------
>
>                 Key: JS2-558
>                 URL: https://issues.apache.org/jira/browse/JS2-558
>             Project: Jetspeed 2
>          Issue Type: Bug
>    Affects Versions: 2.0-FINAL
>         Environment: Apache/2.0.52 (CentOS) with Apache Tomcat 5.5.17 running 
> in jdk1.5.0_03. Jetspeed 2.0 Final.
>            Reporter: Eivinn Hustveit
>         Assigned To: David Sean Taylor
>            Priority: Blocker
>         Attachments: Jetspeed_stacktrace.txt
>
>
> Everything works fine in the portal most of the time, but at random intervals 
> "NULL" is the only text rendered by the browser. I have looked at the 
> jetspeed.log and found out that it prints out a stacktrace which seems to 
> come from the rendering of the layout portlet. I will try to upload this as 
> an attachement.

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