RE: [Wlug] Newbie to mailing list- Issue with the generation of graphsinredhat6.2

Oct. 30, 2002

      So you're saying that you can use X on the machine, right?  If so, I'd look other places for the problem.

Double check that your DISPLAY is set properly and access is enabled.  This was the exact same error message I used to get when java couldn't connect to the xserver.

I find doing something like this:

nohup Xvfb :1 -screen 0 800x600x24 &
sleep 5
export DISPLAY=localhost:1
xhost +
SERVERCOMMAND <- (Whatever you need to do to start the server)

Is best since it uses a virtual x server instead of the real one.  This works around your problem, but is probably the "correct" way to do it anyways.

-Marc

-----Original Message-----
From: Sudhaker P [mailto:perams27@hotmail.com] 
Sent: Wednesday, October 30, 2002 1:23 PM
To: wlug@mail.wlug.org
Subject: RE: [Wlug] Newbie to mailing list- Issue with the generation of graphsinredhat6.2

Hi Marc,
The KDE for the server was not working for it so I fixed it, removing all 
the rpms and re-installing them, I even reinstalled "gd".So I was wondering 
if any other libraries related to X-server were broken too.
My output for
$ps auwx | grep X is as below
root     14500  0.0  0.0  2220  980 tty1     S    09:44   0:00 /bin/sh 
/usr/X11R6/bin/startx
root     14507  0.0  0.0  2344  668 tty1     S    09:44   0:00 xinit 
/etc/X11/xinit/xinitrc --
root     14508  0.7  0.3 18156 7956 ?        S<   09:44   1:07 /etc/X11/X :0

I'd appreciate your suggestions and comments in this regard.

Thanks,

Peram
...
From: "Marc Hughes" <HughesM@tomsnyder.com>
Reply-To: wlug@mail.wlug.org
To: <wlug@mail.wlug.org>
Subject: RE: [Wlug] Newbie to mailing list- Issue with the generation 
of
graphs inredhat6.2
Date: Wed, 30 Oct 2002 10:55:29 -0500
What do you mean when you say it seems broken?  Are there other 
symptoms
besides the java connection to it?
Can you sit down at the machine and use X? If this is a server, you
probably don't want that ability (that's where Xvfb comes in).  What 
Xserver are you running?
If you "ps aux |grep X" do you see an xserver running?
-Marc
-----Original Message-----
From: Sudhaker P [mailto:perams27@hotmail.com]
Sent: Wednesday, October 30, 2002 10:46 AM
To: wlug@mail.wlug.org
Subject: RE: [Wlug] Newbie to mailing list- Issue with the generation 
of
graphs inredhat6.2
Hi Marc,
Thanks for the reply.
I agree with you Marc, it is a servlet(I'm sorry about that) and its on 
the server. The display settings seems to be proper, but my X- server 
seems to be broken. I'd appreciate if you can guide me to any kind of 
information with the help of which I can fix the issue of broken 
X-windows.
Thanks,
Peram
...
From: "Marc Hughes" <HughesM@tomsnyder.com>
Reply-To: wlug@mail.wlug.org
To: <wlug@mail.wlug.org>
Subject: RE: [Wlug] Newbie to mailing list- Issue with the generation 
of graphs inredhat 6.2
Date: Wed, 30 Oct 2002 09:16:11 -0500
I'm guessing this is a server (the errors you showed before made it 
look more like a servlet than an applet)... So are you running X?  If 
so, when you start the server do you set your DISPLAY variable 
correctly?  Does
the
server process have access to the Xserver?
If you're not running an Xserver, you need to.  Weird, huh?  Without 
a running X-Server the JRE can't do most graphical operations, even 
if
those
operations never render to the display.  It's a long standing issue 
that
a
whole lot of people have complained about.  What you can do is run 
Xvfb
...
It's a non graphical X server.  It just gives programs an Xserver to 
play with, and never displays the results of those programs.
-Marc
-----Original Message-----
From: Sudhaker P [mailto:perams27@hotmail.com]
Sent: Wednesday, October 30, 2002 9:08 AM
To: wlug@mail.wlug.org
Subject: Re: [Wlug] Newbie to mailing list- Issue with the generation 
of graphs inredhat 6.2
Hi,
With reply to my previous mail I've figured out that Java "awt" is 
looking for some parameters in X-windows. I think the X is broken. 
I'd appreciate if any of you gurus can guide me with fixing of 
X-windows.
Thanks,
Peram
...
From: "Sudhaker P" <perams27@hotmail.com>
Reply-To: wlug@mail.wlug.org
To: wlug@mail.wlug.org
Subject: Re: [Wlug] Newbie to mailing list- Issue with the 
generation of graphs in redhat 6.2
Date: Tue, 29 Oct 2002 16:07:13 -0600
Hi Karl,
Thanks a lot for the response.
I'm running it as an applet as in the below mentioned weblogic log 
java.lang.NoClassDefFoundError
       at java.lang.Class.forName0(Native Method)
       at java.lang.Class.forName(Class.java:120)
       at
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvi
ronment.java:58)
...
at java.awt.Window.<init>(Window.java:189)
       at java.awt.Frame.<init>(Frame.java:315)
       at java.awt.Frame.<init>(Frame.java:262)
       at com.rivenet.graphingaction.Graphit.runGraph2D(Unknown
Source)
...
at 
com.rivenet.reporting.InformalFundingComparisonGraph.makeGraph(Unkn
ow
n
Source)
       at
jsp_servlet._plan._Model_controller._jspService(_Model_controller.jav
a:356)
...
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
       at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:123)
...
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
textImpl.java:761)
...
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
textImpl.java:708)
...
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
ContextManager.java:252)
...
at
weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
a:346)
...
at
weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:246)
       at 
weblogic.kernel.ExecuteThread.run(ExecuteThread.java:135)
So I was wondering if "awt" since it needs X to generate graphs 
could be the reason and X might be broken.
In your opinion if x is broken what could the rpms that I need to 
install. I'd appreciate your comments and suggestions.
Thanks,
Peram
...
From: Karl Hiramoto <karl@zoop.org>
Reply-To: wlug@mail.wlug.org
To: wlug@mail.wlug.org
Subject: Re: [Wlug] Newbie to mailing list- Issue with the 
generation of graphs in redhat 6.2
Date: Tue, 29 Oct 2002 14:43:56 -0500 (EST)
are you running it from the comand line? or an applet?
Get any errors on your command line?
Did you try on the same machine booting 2.4.16 and 2.4.7 to verify 
that it is the kernel?
On Tue, 29 Oct 2002, Sudhaker P wrote:
...
Hi ,
I've a program that generates graphs with Java 1.3.1_01. The 
same
program is
able to generate graphs on a machine with RH 6.2 kernel 2.4.16 
but it
fails
to generate graphs on a machine with RH 6.2 kernel 2.4.7-10 on 
which it
used
to generate before.  I've installed KDE and gd thinking that 
something
may
broken in the OS on the jpegs generation part. But that doesn't 
seem to help. I'd appreciate if any of you gurus can guide me 
in this issue with your comments and suggestions.
Thanks,
Peram
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Marc Hughes

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