[Scilab-Dev] Scilab GUI and adv-cli fail to launch with java 9

[Atri Bhattacharya]

Dear Clément,

On Wed, 2018-02-21 at 15:25 +0000, Clément David wrote:
> Hello Atri,
> 
> Thanks for your work on porting Scilab to jdk9 ; 

You are welcome. It's mostly based on self-interest: I use scilab
regularly (mostly on the command line though) on openSUSE Tumbleweed.

> this NoClassDefFoundError usually comes from a mis-
> compilation check the jar content and be sure to load it correctly. 

I think the jar content looks ok. I think it's some incompatibility
between jdk 8 and 9 that prevents the classpath from being correctly
used. The same binary works with jdk 8 (even though it is compiled
against jdk 9) once the jre paths in the scilab script are
appropriately adapted; but it doesn't with jdk 9.

> About the patches, I just
> started to review them and will push them on the 6.0 branch after
> fixing the build on my machine;

Many thanks. It will be great if these patches are upstreamed; it would
certainly reduce my work (I maintain Scilab packages for openSUSE)
during version upgrades.

Best wishes.


> Le mercredi 21 février 2018 à 13:19 +0100, Atri Bhattacharya a écrit
> :
> > Hi,
> > After several patches to fix building against java 9, I have been
> > finally able to get scilab 6.0.1 building on openSUSE Tumbleweed.
> > However, during run time, I now see a ClassNotFoundError, as
> > follows:
> > --------------------
> > :~> SCIVERBOSE=1 scilab
> > SCILABBIN : scilab-bin
> > DISABLE_JAVA_DETECTION : 0
> > SCILAB_MODE : gui
> > OS : Linux
> > MODEL : x86_64
> > IS_SCILAB_BINARY : 0
> > Using specified vm: /usr/lib64/jvm/java
> > JAVA_HOME : /usr/lib64/jvm/java
> > SCI : /usr/share/scilab/
> > SCIBIN : /usr/bin/scilab-bin
> > PATH :
> > /usr/share/scilab/:/usr/share/scilab//bin:/usr/bin:/home/badshah400
> > /bin
> > :/usr/local/bin:/usr/bin:/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
> > CLASSPATH :
> > /usr/share/scilab//modules/core/jar/org.scilab.modules.core.jar
> > EGL_DRIVER : 
> > LD_LIBRARY_PATH :
> > /usr/lib64/jvm/java/lib/:/usr/lib64/jvm/java/lib/server/:/usr/lib64
> > /jvm
> > /java/lib/native_threads/
> > DOCBOOK : /usr/share/xml/docbook/stylesheet/nwalsh/current/
> > 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.NoClassDefFoundError:
> > org/scilab/modules/core/Scilab
> > Caused by: java.lang.ClassNotFoundException:
> > org.scilab.modules.core.Scilab
> > 	at
> > java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinC
> > lass
> > Loader.java:582)
> > 	at
> > java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass
> > (Cla
> > ssLoaders.java:185)
> > 	at
> > java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
> > 
> > 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).
> > --------------
> > 
> > All patches are available at [1], and also documented on
> > http://bugzilla.scilab.org/show_bug.cgi?id=15328
> > where unfortunately, I have not seen the needle move much over the
> > recent days.
> > 
> > Scilab does work with java 1.8.0 (have to adapt the JRE paths
> > appropriately in bin/scilab); however, as soon as java 9 is used
> > the
> > above error is manifested. If someone can help fix this issue, that
> > will be very helpful.
> > 
> > openSUSE uses Java 9 by default now, which means as of now scilab
> > is
> > badly broken -- only scilab-cli works -- on openSUSE Tumbleweed and
> > soon to be released Leap 15.0. Unless Scilab's compatibility issues
> > are
> > fixed, we will have to drop it from the distro unfortunately. 
> > 
> > Thanks and best wishes.
> > 
> > [1] https://build.opensuse.org/package/show/home:badshah400:branche
> > s:science/scilab
> > 
> 
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-- 
Atri Bhattacharya
Thu 22 Feb 12:28:07 CET 2018

Sent from openSUSE Tumbleweed on my laptop.