Hi 

Thanks for the feedback. Better on 20.10.

Yeah, happy to help. Maybe a pointer to the best way to start?

Cheers

Ian

-----Original Message-----
From: <email address hidden> <email address hidden> On Behalf Of Sylvestre Ledru
Sent: Monday, 07 December 2020 14:37
To: <email address hidden>
Subject: [Bug 1870813] Re: Scilab does not start on bionic and focal

I guess this package is synchronized from Debian and not maintained in Ubuntu.

Maybe volunteer to help?

--
You received this bug notification because you are subscribed to a duplicate bug report (1877234).
https://bugs.launchpad.net/bugs/1870813

Title:
  Scilab does not start on bionic and focal

Status in Scilab:
  New
Status in scilab package in Ubuntu:
  Fix Released
Status in scilab source package in Bionic:
  Confirmed
Status in scilab source package in Focal:
  Confirmed
Status in scilab source package in Groovy:
  Fix Released

Bug description:
  [Impact]
  Scilab does not start. This is a regression from an OpenJDK 11 update.

  SRU TEAM: please note that scilab runs OpenJDK 8 and since Bionic we have been forcing it to use OpenJDK 11 (see bug 1814133). Since the last Bionic and Focal update there have been fixes from both upstream and Debian to improve compatibility. Apart from those fixes I would like to bring additional fixes to our LTS releases and align them better with the one on Groovy (which works fine):
  * improved dependencies
  * appdata/desktop fixes to improve user experience
  * update from 6.0.1 to 6.0.2 in Bionic

  [Test Case]
  On Bionic or Focal:

  Steps to reproduce:
  1. Install Scilab with `sudo apt-get install scilab`
  2. Try to launch Scilab from terminal by using command `scilab`

  Expected results:
  * Scilab started normally

  Actual results:
  * Scilab does not start, shows the following output in the terminal:

  $ scilab
  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/jvm/jar/org.scilab.modules.jvm.jar:/usr/share/scilab/modules/completion/jar/org.scilab.modules.completion.jar:/usr/share/scilab/modules/graphic_export/jar/org.scilab.modules.graphic_export.jar:/usr/share/scilab/modules/external_objects_java/tests/libintl.jar:/usr/share/scilab/modules/external_objects_java/jar/org.scilab.modules.external_objects_java.jar:/usr/share/scilab/modules/scirenderer/jar/scirenderer.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/console/jar/org.scilab.modules.console.jar:/usr/share/scilab/modules/graphic_objects/jar/org.scilab.modules.graphic_objects.jar:/usr/share/scilab/modules/xcos/jar/org.scilab.modules.xcos.jar:/usr/share/scilab/modules/commons/jar/org.scilab.modules.commons.jar:/usr/share/scilab/modules/graph/jar/org.scilab.modules.graph.jar:/usr/share/scilab/modules/gui/jar/org.scilab.modules.gui.jar:/usr/share/scilab/modules/renderer/jar/org.scilab.modules.renderer.jar:/usr/share/scilab/modules/helptools/jar/scilab_ja_JP_help.jar:/usr/share/scilab/modules/helptools/jar/scilab_fr_FR_help.jar:/usr/share/scilab/modules/helptools/jar/scilab_pt_BR_help.jar:/usr/share/scilab/modules/helptools/jar/scilab_ru_RU_help.jar:/usr/share/scilab/modules/helptools/jar/scilab_en_US_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/types/jar/org.scilab.modules.types.jar:/usr/share/scilab/modules/localization/jar/org.scilab.modules.localization.jar:/usr/share/scilab/modules/javasci/jar/org.scilab.modules.javasci.jar:/usr/share/scilab/modules/preferences/jar/org.scilab.modules.preferences.jar:/usr/share/scilab/modules/core/jar/org.scilab.modules.core.jar:/usr/share/scilab/modules/history_browser/jar/org.scilab.modules.history_browser.jar:/usr/share/scilab/modules/ui_data/jar/org.scilab.modules.ui_data.jar:/usr/share/scilab/modules/scinotes/jar/org.scilab.modules.scinotes.jar:
  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).

  [Regression Potential]
  Updating scilab fixes a regression introduced by a previous OpenJDK 11 update that prevented it from running.

  * The patch that fix the library path regression OpenJDK 11 might
  regress on a later if OpenJDK 11 changes how the library path is
  loaded.

  Additionally on Focal the update brings the following updates from Groovy:
  * add missing runtime dependencies for 2 graphical libraries (libfreehep-graphicsio-java and libfreehep-util-java)
  * fix desktop, appdata, and icons: this improves user experience, can regress or cause interference with custom files create by the user.
  * make the classpath more flexible: makes the classpath less dependend on hard-coded versions, so when runtime dependencies are updated scilab still works, but could regress if the packaged jar gets updated to a new version with an incompatible API (unlikely on Focal).
  * update font dependencies from ttf-dejavu-core to fonts-dejavu-core: ttf-dejavu-core is a dummy transitional package that depends on fonts-dejavu-core so ttf-dejavu-core should already be installed when doing an update, can regress if the ttf-dejavu-core font path changes (unlikely to happen on Focal).

  On Bionic, all the fixes above plus:
  * Update from 6.0.1 to 6.0.2 drops a lot of debian/patches that were applied upstream or fixed in some other way. This *is* a big change with 305 fixes but brings various important fixes from 6.0.2 (which is the last stable release for 6.0). That said, regressions are expected, but so would I expect bug reports if simply fixing 6.0.1 and leaving all the 6.0.2 fixes behind.
  And, just for the sake of argument, if anyone asks "why not update to 6.1 then as that would possibily fix even more bugs?" besides that obviously falling out of SRU definition, the answer is that such change does cause regressions for users because various scilab 'addons' don't yet support 6.1. We do gain from having 6.0 in Bionic and 6.1 in Focal as users can stay on the LTS distro that better supports their needs.
  * patch to support HDF5 1.10 on scilab 6.0 which is being tracked on bug 1765503

  [Other Info]
  The foundations team worked with the security team on the OpenJDK 11 migration. Steve Beattie was involved. We got help approving changes from the SRU team member Lukasz Zemczak.

  I am subscribed to the package and will be keeping an eye on the
  scilab update. I do plan to investigate and fix bugs introduced by
  this SRU, specially on Bionic were we update from 6.0.1 to 6.0.2.

  Upstream claims that code and test quality is good, with unit and
  regression tests being done as well as code coverage [1,2] but the
  builds are not reacheable [3] and compilation chain [4] requires a
  login. The bug tracker [5] has 80 open bugs for 6.0.1 (9
  blocker/critical) and 100 open bugs for 6.0.2 (7 blocker/critical). I
  don't see any significant commits to the 6.0 branch [6] after 6.0.2
  release.

  References:
  [1] https://www.scilab.org/about/scilab-open-source-software
  [2] https://scan.coverity.com/projects/881
  [3] http://build.scilab.org/
  [4] http://compilationchain.scilab.org/
  [5] http://bugzilla.scilab.org
  [6] http://gitweb.scilab.org/?p=scilab.git;a=shortlog;h=refs/heads/6.0

  [From original report]
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: scilab 6.1.0+dfsg1-1ubuntu3
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Sat Apr  4 19:12:56 2020
  InstallationDate: Installed on 2020-04-04 (0 days ago)
  InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  PackageArchitecture: all
  SourcePackage: scilab
  UpgradeStatus: No upgrade log present (probably fresh install)

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