Setting user.timezone in jnlp

I have no success in setting the user.timezone property through the jnlp-file. I have seen a similar experience reported a couple of years ago:
http://forum.java.sun.com/thread.jspa?forumID=38&threadID=431709
Is it doable?
I can't set it in the code, because we are suffering from a timezone/thread-related bug reported (for instance) here:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6352812
Right now we are using aspects for the sole purpose of fixing this problem, but apparently that has it problems as well from time to time at the customer site.
Thanks!
/Claes

I think the "user.timezone" is consided as "unsafe" and cannot be set by JNLP; similar complain can be found when setting user.language see: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4683242
In fast there are only six properties considered to be �safe�:
sun.java2d.noddraw
javaws.cfg.jauthenticator
swing.useSystemFontSettings
swing.metalTheme
http.agent
http.keepAlive
See http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/syntax.html

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Update:
I've tried to fix the problem nearly the whole day.
I've debugged the fillCalendar()-Method while inserting the first Task:
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Somewhere must stand my timezone and the calendar refuses to display the view in UTC!!! But where?
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Hi Frank,
Thanks for your reply.
You can now look only at the code in the first IF-Condition: (Facility)
I've just tried to replace "UTC" with "CST"... in debugger he calculates me the new times:
startDate: 13.05.2008 05:00:00 Zentrale Normalzeit false
endDate: 14.05.2008 04:59:00 Zentrale Normalzeit false It works...
The problem is only that the calendar contextelement doesn't set this new time now. It creates the task from 7:00 to 6:59 .... 2 hours later.
These 2 hours are the difference from myTimeZone (the user i logged in: Europe/Berlin = UTC+2h) to UTC.
So I want that the default timezone of the calender is UTC and not the timezone from the logged in user.
But I can't logon without user (then it works!) because I need the User for another functionality (myTimeZone)

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863866 wrote:
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