[Scilab-users] Really headless figure generation in scilab

[Antoine Monmayrant]

Hello Stéphane,


Sadly, after some testings, it doe not seem to work for me on the 
machine I connect to with ssh (see transcript below).
The connection is done with bare 'ssh' and not 'ssh -X' (contrary to 
what I wrote in a previous email) and your combination of env variables 
still results in a bunch of errors...


Cheers,

Antoine

//////////////////////////

ssh remotemachine
SCI_DISABLE_TK=1 SCI_JAVA_ENABLE_HEADLESS=1 
_JAVA_OPTIONS='-Djava.awt.headless=true' scilab-adv-cli
Error: unable to open display
Picked up _JAVA_OPTIONS: 
-Djava.class.path=/usr/share/java/flexdock.jar:/usr/share/java/skinlf.jar:/usr/share/java/looks.jar:/usr/share/java/commons-logging.jar:/usr/share/java/jhall.jar:/usr/share/java/lucene-core-4.10.4.jar:/usr/share/java/lucene-analyzers-common-4.10.4.jar:/usr/share/java/lucene-queryparser-4.10.4.jar:/usr/share/maven-repo/org/freehep/freehep-util/debian/freehep-util-debian.jar:/usr/share/maven-repo/org/freehep/freehep-io/debian/freehep-io-debian.jar:/usr/share/maven-repo/org/freehep/freehep-graphicsio/debian/freehep-graphicsio-debian.jar:/usr/share/java/freehep-graphicsio-emf-2.1.jar:/usr/share/java/freehep-graphics2d-2.1.1.jar:/usr/share/java/jrosetta-API.jar:/usr/share/java/jrosetta-engine-1.0.4.jar:/usr/share/java/jgraphx.jar:/usr/share/java/jogl2.jar:/usr/share/java/gluegen2-rt.jar:/usr/share/java/jeuclid-core.jar:/usr/share/java/jlatexmath-fop-1.0.7.jar:/usr/share/java/fop.jar:/usr/share/java/saxon.jar:/usr/share/java/batik.jar:/usr/share/java/xml-apis-ext.jar:/usr/share/java/commons-io.jar:/usr/share/java/xmlgraphics-commons.jar:/usr/share/java/avalon-framework.jar:/usr/share/java/jlatexmath-1.0.7.jar:/usr/share/java/ecj.jar:/usr/share/java/javax.activation.jar:/usr/share/java/jaxb-runtime.jar:/usr/share/scilab/modules/graphic_objects/jar/org.scilab.modules.graphic_objects.jar:/usr/share/scilab/modules/javasci/jar/org.scilab.modules.javasci.jar:/usr/share/scilab/modules/completion/jar/org.scilab.modules.completion.jar:/usr/share/scilab/modules/preferences/jar/org.scilab.modules.preferences.jar:/usr/share/scilab/modules/scirenderer/jar/scirenderer.jar:/usr/share/scilab/modules/graph/jar/org.scilab.modules.graph.jar:/usr/share/scilab/modules/renderer/jar/org.scilab.modules.renderer.jar:/usr/share/scilab/modules/ui_data/jar/org.scilab.modules.ui_data.jar:/usr/share/scilab/modules/localization/jar/org.scilab.modules.localization.jar:/usr/share/scilab/modules/scinotes/jar/org.scilab.modules.scinotes.jar:/usr/share/scilab/modules/types/jar/org.scilab.modules.types.jar:/usr/share/scilab/modules/history_browser/jar/org.scilab.modules.history_browser.jar:/usr/share/scilab/modules/commons/jar/org.scilab.modules.commons.jar:/usr/share/scilab/modules/console/jar/org.scilab.modules.console.jar:/usr/share/scilab/modules/action_binding/jar/org.scilab.modules.action_binding.jar:/usr/share/scilab/modules/history_manager/jar/org.scilab.modules.history_manager.jar:/usr/share/scilab/modules/core/jar/org.scilab.modules.core.jar:/usr/share/scilab/modules/external_objects_java/jar/org.scilab.modules.external_objects_java.jar:/usr/share/scilab/modules/xcos/jar/org.scilab.modules.xcos.jar:/usr/share/scilab/modules/graphic_export/jar/org.scilab.modules.graphic_export.jar:/usr/share/scilab/modules/jvm/jar/org.scilab.modules.jvm.jar:/usr/share/scilab/modules/gui/jar/org.scilab.modules.gui.jar:/usr/share/scilab/modules/helptools/jar/scilab_ru_RU_help.jar:/usr/share/scilab/modules/helptools/jar/scilab_images.jar:/usr/share/scilab/modules/helptools/jar/org.scilab.modules.helptools.jar:/usr/share/scilab/modules/helptools/jar/scilab_en_US_help.jar: 
-Djava.awt.headless=true
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.scilab.modules.jvm.LibraryPath 
(file:/usr/share/scilab/modules/jvm/jar/org.scilab.modules.jvm.jar) to 
field java.lang.ClassLoader.sys_paths
WARNING: Please consider reporting this to the maintainers of 
org.scilab.modules.jvm.LibraryPath
WARNING: Use --illegal-access=warn to enable warnings of further illegal 
reflective access operations
WARNING: All illegal access operations will be denied in a future release
Could not access to the Main Scilab Class:
Exception in thread "main" java.lang.ExceptionInInitializerError
         at org.scilab.modules.localization.Messages.gettext(Unknown Source)
         at 
org.scilab.modules.commons.xml.XConfiguration.<clinit>(Unknown Source)
         at org.scilab.modules.core.Scilab.<clinit>(Unknown Source)
Caused by: java.lang.NullPointerException
         at 
java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2646)
         at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:830)
         at java.base/java.lang.System.loadLibrary(System.java:1870)
         at org.scilab.modules.localization.MessagesJNI.<clinit>(Unknown 
Source)
         ... 3 more

Scilab cannot create Scilab Java Main-Class (we have not been able to 
find the main Scilab class. Check if the Scilab and thirdparty packages 
are available).




On 29/04/2020 15:18, Stéphane Mottelet wrote:
> You should start Scilab this way:
>
> SCI_DISABLE_TK=1 SCI_JAVA_ENABLE_HEADLESS=1 
> _JAVA_OPTIONS='-Djava.awt.headless=true' bin/scilab-adv-cli
>
> You will be able to use graphic commands (without visible output) and 
> then export directy with e.g. xs2pdf.
>
> S.
>
> Le 29/04/2020 à 14:51, Antoine Monmayrant a écrit :
>> Hello All,
>>
>> Here is a Covid19 & forced remote work issue.
>> One of my students has to run some of his simulations and generate 
>> png/svg figures on a linux workstation we don't have physical access 
>> to given the current lockdown.
>>
>> The problem is that from his Windows laptop without X server, he 
>> cannot "ssh -YC" to the linux workstation but only "ssh -X".
>> He thus only have access to "-nogui" or "-nwni" modes were all the 
>> graphics macros are deactivate.
>>
>> Any of you ever faced a similar situation and found a solution?
>>
>> Thanks in advance,
>>
>>
>> Antoine
>>
>> PS: it's a pity that scilab is not able to do real headless figure 
>> generation.
>>
>> _______________________________________________
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>>
>