Re: [jCharts-users] RE: ChartProperties cp = new ChartProperties() throws exception (Unix)

[Nathaniel G. A. <nat...@ya...>]

yeah, if you are running jdk 1.4.x you can pass a property to the jvm to run headless. Also, you
can give the jar at http://www.eteks.com/pja/en/ a try.

Take a look at the user guide section:
http://jcharts.sourceforge.net/userGuide/exportingImages.html



--- Steven M Sombar <sms...@us...> wrote:
> 
> 
> 
> 
> An answer to the question
> 
> RE:  exception Cannot connect to X11 window server
> at  ChartProperties cp = new ChartProperties() throws exception (Unix)
> when jCharts run from cron (disconnected virtual machine).
> 
> It is not unusual for chart image generation software to
> require access to an XServer when run under Unix.  This is
> because of Java, specifically graphical objects (i.e. charts).
> In Unix, Java's graphics libraries (the Java AWT) are
> implemented on top of XWindows/Motif graphics libraries.
> These XWindows/Motif graphics libraries require an XServer.
> 
> The need to make charts on Unix machines that do
> not have Xservers on them is common.  Some machines
> are headless (a machine without a monitor/mouse/keyboard attached)
> Or you may be wanting to generate charts automatically,
> using cron, without haveing to specifically be logged-in.
> 
> A solution to this problem is to run a virtual X Server.
> A virtual X server can run on a machine without any display
> hardware.  It can also peacefully co-exist with other XServers
> that may be running on the same computer.
> 
> One common XServer is Xvfb "a virtual frame buffer XServer" from
> the X consortium.
> 
> 
> Regards,
>    Steven M Sombar/Austin/IBM@IBMUS       W5OHM
>    smsombar@us.....
>    Phone 512-838-3353
> 
> 
> 
> 
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