[Bug 2139244] [NEW] Null Pointer Exception in Sweet Home 3D Design Software with KDE and Java

Michel Matte 2139244 at bugs.launchpad.net
Tue Jan 27 19:51:51 UTC 2026 

Public bug reported:

I installed SW3D from the latest website version. I tried from the
desktop icon and the terminal and got a Null Pointer Exception (see
output below).

I was running version 7.5 on the same machine under Debian_MX-Linux 21 with XFCE without problem.
I tried the snap version from the Ubuntu repository. It works but is outdated version 6.6 and does not open correctly models created with version 7.5. The flatpak version 7.5 found here https://flathub.org/en/apps/com.sweethome3d.Sweethome3d doesn't work either (files not found and null pointer exception).

Tried other versions of Java without success.

Reference for more details
https://www.sweethome3d.com/support/forum/viewthread_thread,14505;jsessionid=32B4A57A9BE8BC11AFC242065F372A07.web-
prod-2

./SweetHome3D-Java3D-1_5_2
-e 
# List Sweet Home 3D script ====================================================================

./SweetHome3D-Java3D-1_5_2
#!/bin/sh

echo -e "\n# List Sweet Home 3D script ====================================================================\n"
echo $0
cat $0

# Retrieve Sweet Home 3D directory
PROGRAM=`readlink "$0"`
if [ "$PROGRAM" = "" ]; then
  PROGRAM=$0
fi
PROGRAM_DIR=`dirname "$PROGRAM"`

# Original RUNTIME setting
RUNTIME="$PROGRAM_DIR"/runtime
# Change "$PROGRAM_DIR"/runtime to /usr/java/jre1.8.0_481 in ~/SweetHome3D-7.5/SweetHome3D-Java3D-1_5_2
#RUNTIME=/usr/java/jre1.8.0_481
# Change "$PROGRAM_DIR"/runtime to /usr/lib/jvm/java-21-openjdk-amd64 in ~/SweetHome3D-7.5/SweetHome3D-Java3D-1_5_2
#RUNTIME=/usr/lib/jvm/java-21-openjdk-amd64

# Run Sweet Home 3D
echo -e "\n#  Run Sweet Home 3D ====================================================================\n"

exec "$RUNTIME"/bin/java -Xmx2g -classpath "$PROGRAM_DIR"/lib/SweetHome3D.jar:"$PROGRAM_DIR"/lib/Furniture.jar:"$PROGRAM_DIR"/lib/Textures.jar:"$PROGRAM_DIR"/lib/Examples.jar:"$PROGRAM_DIR"/lib/Help.jar:"$PROGRAM_DIR"/lib/batik-svgpathparser-1.7.jar:"$PROGRAM_DIR"/lib/jeksparser-calculator.jar:"$PROGRAM_DIR"/lib/iText-2.1.7.jar:"$PROGRAM_DIR"/lib/freehep-vectorgraphics-svg-2.1.1c.jar:"$PROGRAM_DIR"/lib/sunflow-0.07.3i.jar:"$PROGRAM_DIR"/lib/jmf.jar:"$PROGRAM_DIR"/lib/j3dcore.jar:"$PROGRAM_DIR"/lib/j3dutils.jar:"$PROGRAM_DIR"/lib/vecmath.jar:"$PROGRAM_DIR"/lib/jnlp.jar -Djava.library.path="$PROGRAM_DIR"/lib:"$PROGRAM_DIR"/lib/yafaray -Dcom.eteks.sweethome3d.applicationId=SweetHome3D#Installer com.eteks.sweethome3d.SweetHome3D -open "$1"
-e 
#  Run Sweet Home 3D ====================================================================

Java 3D: implicit antialiasing enabled
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at sun.awt.X11FontManager.getFileNameFromPlatformName(X11FontManager.java:174)
        at sun.font.SunFontManager.initCompositeFonts(SunFontManager.java:3481)
        at sun.font.SunFontManager.access$700(SunFontManager.java:65)
        at sun.font.SunFontManager$2.run(SunFontManager.java:545)
(etc...)

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.27
ProcVersionSignature: Ubuntu 6.14.0-37.37~24.04.1-generic 6.14.11
Uname: Linux 6.14.0-37-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Tue Jan 27 14:40:26 2026
InstallationDate: Installed on 2025-11-11 (77 days ago)
InstallationMedia: Kubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade noble

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https://bugs.launchpad.net/bugs/2139244

Title:
  Null Pointer Exception in Sweet Home 3D Design Software with KDE and
  Java

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I installed SW3D from the latest website version. I tried from the
  desktop icon and the terminal and got a Null Pointer Exception (see
  output below).

  I was running version 7.5 on the same machine under Debian_MX-Linux 21 with XFCE without problem.
  I tried the snap version from the Ubuntu repository. It works but is outdated version 6.6 and does not open correctly models created with version 7.5. The flatpak version 7.5 found here https://flathub.org/en/apps/com.sweethome3d.Sweethome3d doesn't work either (files not found and null pointer exception).

  Tried other versions of Java without success.

  Reference for more details
  https://www.sweethome3d.com/support/forum/viewthread_thread,14505;jsessionid=32B4A57A9BE8BC11AFC242065F372A07.web-
  prod-2

  ./SweetHome3D-Java3D-1_5_2
  -e 
  # List Sweet Home 3D script ====================================================================

  ./SweetHome3D-Java3D-1_5_2
  #!/bin/sh

  echo -e "\n# List Sweet Home 3D script ====================================================================\n"
  echo $0
  cat $0

  # Retrieve Sweet Home 3D directory
  PROGRAM=`readlink "$0"`
  if [ "$PROGRAM" = "" ]; then
    PROGRAM=$0
  fi
  PROGRAM_DIR=`dirname "$PROGRAM"`

  # Original RUNTIME setting
  RUNTIME="$PROGRAM_DIR"/runtime
  # Change "$PROGRAM_DIR"/runtime to /usr/java/jre1.8.0_481 in ~/SweetHome3D-7.5/SweetHome3D-Java3D-1_5_2
  #RUNTIME=/usr/java/jre1.8.0_481
  # Change "$PROGRAM_DIR"/runtime to /usr/lib/jvm/java-21-openjdk-amd64 in ~/SweetHome3D-7.5/SweetHome3D-Java3D-1_5_2
  #RUNTIME=/usr/lib/jvm/java-21-openjdk-amd64

  # Run Sweet Home 3D
  echo -e "\n#  Run Sweet Home 3D ====================================================================\n"

  exec "$RUNTIME"/bin/java -Xmx2g -classpath "$PROGRAM_DIR"/lib/SweetHome3D.jar:"$PROGRAM_DIR"/lib/Furniture.jar:"$PROGRAM_DIR"/lib/Textures.jar:"$PROGRAM_DIR"/lib/Examples.jar:"$PROGRAM_DIR"/lib/Help.jar:"$PROGRAM_DIR"/lib/batik-svgpathparser-1.7.jar:"$PROGRAM_DIR"/lib/jeksparser-calculator.jar:"$PROGRAM_DIR"/lib/iText-2.1.7.jar:"$PROGRAM_DIR"/lib/freehep-vectorgraphics-svg-2.1.1c.jar:"$PROGRAM_DIR"/lib/sunflow-0.07.3i.jar:"$PROGRAM_DIR"/lib/jmf.jar:"$PROGRAM_DIR"/lib/j3dcore.jar:"$PROGRAM_DIR"/lib/j3dutils.jar:"$PROGRAM_DIR"/lib/vecmath.jar:"$PROGRAM_DIR"/lib/jnlp.jar -Djava.library.path="$PROGRAM_DIR"/lib:"$PROGRAM_DIR"/lib/yafaray -Dcom.eteks.sweethome3d.applicationId=SweetHome3D#Installer com.eteks.sweethome3d.SweetHome3D -open "$1"
  -e 
  #  Run Sweet Home 3D ====================================================================

  Java 3D: implicit antialiasing enabled
  Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
          at sun.awt.X11FontManager.getFileNameFromPlatformName(X11FontManager.java:174)
          at sun.font.SunFontManager.initCompositeFonts(SunFontManager.java:3481)
          at sun.font.SunFontManager.access$700(SunFontManager.java:65)
          at sun.font.SunFontManager$2.run(SunFontManager.java:545)
  (etc...)

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ubuntu-release-upgrader-core 1:24.04.27
  ProcVersionSignature: Ubuntu 6.14.0-37.37~24.04.1-generic 6.14.11
  Uname: Linux 6.14.0-37-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.8
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Tue Jan 27 14:40:26 2026
  InstallationDate: Installed on 2025-11-11 (77 days ago)
  InstallationMedia: Kubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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