Re: Can't connect to X11 window server using '0:0' as the value ofthedisplay and now java.awt.HeadlessException

[Georges Roux]

Sorry but with headless I can't create a Frame, with Xvfb I can.

Georges

Andy Eastham wrote:

Hi,

I would say that Xvfb does _not_ connect to your display adapter - the v
stands for virtual, ie it's not a real frame buffer as in a video card -
it's a virtual one in your systems normal memory.
It's specifically for taking the place of a display adapter when your server
doesn't have one.
We always used to use this on sun E250s without a display adapter, but now
we use headless as it's more reliable.
Andy

 

-----Original Message-----
From: p niemandt [mailto:[EMAIL PROTECTED]
Sent: 20 March 2003 21:47
To: Tomcat Users List
Subject: Re: Can't connect to X11 window server using '0:0' as the value
ofthe display and now java.awt.HeadlessException
Yep: Done correctly, this is probably the more 'correct' solution, but,
and I'm probably opening myself to a lot of flamebait, but I do suspect
that using something like Xvfb might give some advantages that using
headless won't. For example, and I'm just guessing, but I think that
'headless' is purely a software solution, while Xvfb might be connected
to your display adaptor, and therefor might be faster or less of a drain
on your system resources.
{
But, like I said, I have no documentation to back up this statement,
this is purely a guess and based on my personal findings: If anybody
else knows differently, I would be very interested to know more, as I'm
doing a lot more graphics orientated servlets, that usually run on
headless boxes }


On Thu, 2003-03-20 at 20:36, Micael wrote:
   

For me the easiest thing was just to provide the right command
     

line options
   

(java.awt.headless=true) when I started up Tomcat.

At 02:27 PM 3/20/03 -0500, you wrote:
     

At 07:18 PM 3/20/2003 +0000, you wrote:
       

ok: there is another solution to the headless thing: (I wrote a
graphical servlet that runs on a linux box without X, and had the same
problems: The headless seemed to work, well, kinda, but not to my
liking): So I went the xvfb route: This is a virtual frame
         

buffer to can
   

install on a linux box that emulates an X session, which then kinda
solves all the graphical problems in one step. You set the xvfb to the
resolution required and just start and forget about it.
Worth I shot, I'd say, and might safe you hours of frustration [It did
me ;-) ].
         

I had tried xvfb and had some difficulties. Any pointers?
       

suggestions?
   

Thanks,
Glenn


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