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MathGroup Archive 2005

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webMathematica problems if using Xvnc

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62434] webMathematica problems if using Xvnc
  • From: Dave <INVALID.See-signature-for-how-to-determine at southminister-branch-line.org.uk>
  • Date: Thu, 24 Nov 2005 06:33:31 -0500 (EST)
  • Reply-to: Nov-2005 at southminister-branch-line.org.uk
  • Sender: owner-wri-mathgroup at wolfram.com

Sorry this is a bit long, but I can't really make it shorter. Any help 
appreciated.


I'm trying to run webMathematica on a Sun UNIX box, but are having a 
problem in that the only way I can use it requires a user logged in all 
the time on the console. Otherwise I get a

"HTTP Status 500 - webMathematica timeout error."

If I think about this, I can't understand how it can possibly work, 
since I believe there is no way for Mathematica to connect to the Xvnc 
without a password, and there is nowhere where the startup script has 
the password. The docs don't mention a password (other than say set one) 
so perhaps I am wrong.

I'm using:

Solaris 9 on a Sun Ultra 80, 360 MHz, 512 MB RAM.
Mathematica 5.2
webMathematica 2.1
Tomcat 5.5.12
Xvnc Free Edition 4.1.1
(Despite I have installed this user /usr/local/apache2, it is not 
currently using Apache at all).

I have created a user 'tomcat' under which I want to run Tomcat. I can 
get webMathematica working fine, with graphs etc, but ONLY if

a) I don't use Xvnc
b) Log into the console as user 'tomcat'.
c) Run Tomcat as user tomcat.
d) Run xhoost +localhost on the machine with the webMathematica, 
Mathematica and Tomcat.

e) Don't mind the console being tied up with user 'tomcat' logged in.


I'd like if possible to avoid this and use Xvnc as detailed in the 
documentation.

http://documents.wolfram.com/webmathematica/v2/index_2_4.html

I want to test by viewing on my main workstation 'sparrow'. This is what 
I am doing, which does *not* work.

1) From the workstation 'sparrow' I log onto the machine main-webserver, 
where Mathematica, Tomcat and webMathematica all run from. I log is as 
the user who will run Tomcat.

sparrow /export/home/drkirkby % ssh -l tomcat main-webserver
tomcat@main-webserver's password:

2) Next I start vncserver on the host "web-server", as a user 'tomcat'

main-webserver /usr/local/apache2/apache-tomcat-5.5.12 $ vncserver

New 'main-webserver:1 (tomcat)' desktop is main-webserver:1

Starting applications specified in 
/usr/local/apache2/apache-tomcat-5.5.12/.vnc/xstartup
(SHOULD THAT START MATHEMATICA ???)
Log file is 
/usr/local/apache2/apache-tomcat-5.5.12/.vnc/main-webserver:1.log

3) Next I start Tomcat on the machine main-webserver. Since I am logged 
in as user 'tomcat', it clearly starts as that user.

main-webserver /usr/local/apache2/apache-tomcat-5.5.12 $ bin/startup.sh
Using CATALINA_BASE:   /usr/local/apache2/apache-tomcat-5.5.12
Using CATALINA_HOME:   /usr/local/apache2/apache-tomcat-5.5.12
Using CATALINA_TMPDIR: /usr/local/apache2/apache-tomcat-5.5.12/temp
Using JRE_HOME:       /usr/java

4) At this point, the only webMathematica examples that will run are 
those that probably do not connect to the X server (Hello.html, 
Expand.html and a couple more). Others such as those that generate 
graphs, or even Integrate.html, which typesets output, generates a Timeout.

But how is Mathematica supposed to connect to Xvnc unless it knows the 
password I entered?

Anyway, it fails to work.

5) If I try to connect to the host "main-webserver" via Xvnc from the 
original workstation (sparrow) it works fine, so Xvnc is working.


6) Here is my MSP.conf  file:

KernelNumber=1
KernelAcquireLimit=2000
KernelTimeLimit=30000
MathLinkArguments.Windows=-linkname 'C:\\Program Files\\Wolfram 
Research\\Mathematica\\5.0\\MathKernel.exe -mathlink' -linkmode launch
MathLinkArguments.Unix=-linkname 'math -mathlink' -linkmode launch
MathLinkArguments.MacOSX=-linkname '"/Applications/Mathematica 
5.0.app/Contents/MacOS/MathKernel" -mathlink' -linkmode launch
MathLinkArguments=-linkname '/usr/local/bin/math -mathlink' -linkmode launch
FrontEndLaunchCommand=mathematica -mathlink -display main-webserver:1 
-nogui -geometry 1000x500+10+10
VerboseLogs=true
StaticFileExtensions=gif:image/gif,jpg:image/jpeg,jpeg:image/jpeg


7) Here is some of the Tomcat's logs, with verbose logs eneabled.


INFO: MSP: ************* Start Initializing Kernel 0 *************
Nov 23, 2005 4:56:43 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: MSPDirectory 
/usr/local/apache2/apache-tomcat-5.5.12/webapps/webMathematica/WEB-INF/MSPScripts
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: Mathlet Timeout 30000/1050.
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: Setting Security
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: No security file
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: AllowedContexts
{Global`}
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: DisallowedContexts
MSP`Utility`DisallowedContexts
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: AllowedSymbols
HoldComplete[Plus, Times, Power, Sqrt, Log, Exp, HoldComplete, Infinity, 
Pi, E, Degree,

 >   GoldenRatio, Catalan, EulerGamma, OutputForm, StandardForm, List, 
Sin, Cos, Tan, Sec, Csc, Cot,

<snip - more Mathematica functions listed>

 >   DiracDelta, UnitStep, DiscreteDelta, KroneckerDelta, Identity, 
Function, Slot, GrayLevel, Hue,

 >   RGBColor, CMYKColor, Automatic, None, All, Null, O, C]
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: DisallowedSymbols
MSP`Utility`DisallowedSymbols
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: Verbose Logs true
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: FrontEndLaunchCommand mathematica -mathlink 
-display main-webserver:1 -nogui -geometry 1000x500+10+10
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: FrontEndGraphics = True
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: MSP`Utility`CheckToExpression = True
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Kernel 0: ImageAltText =
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Init Kernel 0: Enabling Servlet References
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: ************* End Initializing Kernel 0 *************
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: General KernelData0:: Adding Message Listener
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Custom tag:: this evaluation is being aborted.
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Custom tag:: allocate_kernel (end tag)
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: Setting error 500 due to webMathematica timeout error.
Nov 23, 2005 4:56:44 PM org.apache.catalina.core.ApplicationContext log
INFO: MSP: General KernelPool::Kernel 0 returned


-- 
Dave K

http://www.southminster-branch-line.org.uk/

Please note my email address changes periodically to avoid spam.
It is always of the form: month-year@domain. Hitting reply will work
for a couple of months only. Later set it manually. The month is
always written in 3 letters (e.g. Jan, not January etc)


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