Snap not runnable due to NullPointerException in java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1262)

[brlin-tw]

Run the 4 revision of the snap resulted in the following error:

$ snap run bytecode-viewer
https://the.bytecode.club - Created by @Konloch - Bytecode Viewer 2.9.22, Fat-Jar: true
Exception in thread "main" java.lang.InternalError: java.lang.reflect.InvocationTargetException
        at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:86)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
        at java.desktop/sun.font.SunFontManager.getInstance(SunFontManager.java:249)
        at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:265)
        at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1243)
        at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
        at java.desktop/javax.swing.plaf.basic.BasicGraphicsUtils.getPreferredButtonSize(BasicGraphicsUtils.java:351)
        at java.desktop/javax.swing.plaf.basic.BasicButtonUI.getPreferredSize(BasicButtonUI.java:474)
        at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
        at java.desktop/javax.swing.plaf.metal.MetalDesktopIconUI.installComponents(MetalDesktopIconUI.java:86)
        at java.desktop/javax.swing.plaf.basic.BasicDesktopIconUI.installUI(BasicDesktopIconUI.java:83)
        at java.desktop/javax.swing.JComponent.setUI(JComponent.java:685)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.setUI(JInternalFrame.java:2162)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.updateUI(JInternalFrame.java:2210)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.<init>(JInternalFrame.java:2142)
        at java.desktop/javax.swing.JInternalFrame.<init>(JInternalFrame.java:348)
        at the.bytecode.club.bytecodeviewer.gui.VisibleComponent.<init>(VisibleComponent.java:42)
        at the.bytecode.club.bytecodeviewer.gui.WorkPane.<init>(WorkPane.java:58)
        at the.bytecode.club.bytecodeviewer.gui.MainViewerGUI.<init>(MainViewerGUI.java:198)
        at the.bytecode.club.bytecodeviewer.BytecodeViewer.main(BytecodeViewer.java:533)
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
        at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
        ... 20 more
Caused by: java.lang.NullPointerException
        at java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1262)
        at java.desktop/sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:225)
        at java.desktop/sun.awt.FontConfiguration.init(FontConfiguration.java:107)
        at java.desktop/sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:719)
        at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:379)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.SunFontManager.<init>(SunFontManager.java:324)
        at java.desktop/sun.awt.FcFontManager.<init>(FcFontManager.java:35)
        at java.desktop/sun.awt.X11FontManager.<init>(X11FontManager.java:56)
        ... 25 more

Seems to be related to NPE at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264) when using install4j caused by font config missing · Issue #693 · adoptium/temurin-build.

[brlin-tw]

Adding the following prime scriptlet to the main part:

      # Fix Java runtime crashes with java.lang.NullPointerException in
      # java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java)
      # https://github.com/adoptium/adoptium-support/issues/70
      printf \
        'version=1\nsequence.allfonts=default\n' \
        >usr/lib/jvm/java-11-openjdk-${SNAPCRAFT_TARGET_ARCH}/lib/fontconfig.properties

does resolve the error, however, another error is triggered when launching:

$ snap run bytecode-viewer
https://the.bytecode.club - Created by @Konloch - Bytecode Viewer 2.9.22, Fat-Jar: true
Exception in thread "main" java.lang.Error: Probable fatal error: No physical fonts found.
        at java.desktop/sun.font.SunFontManager.lambda$getDefaultPhysicalFont$0(SunFontManager.java:1110)
        at java.base/java.util.Optional.orElseThrow(Optional.java:408)
        at java.desktop/sun.font.SunFontManager.getDefaultPhysicalFont(SunFontManager.java:1110)
        at java.desktop/sun.font.CompositeFont.doDeferredInitialisation(CompositeFont.java:291)
        at java.desktop/sun.font.CompositeFont.getSlotFont(CompositeFont.java:376)
        at java.desktop/sun.font.CompositeStrike.getStrikeForSlot(CompositeStrike.java:80)
        at java.desktop/sun.font.CompositeStrike.getFontMetrics(CompositeStrike.java:95)
        at java.desktop/sun.font.FontDesignMetrics.initMatrixAndMetrics(FontDesignMetrics.java:360)
        at java.desktop/sun.font.FontDesignMetrics.<init>(FontDesignMetrics.java:351)
        at java.desktop/sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:303)
        at java.desktop/sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1243)
        at java.desktop/javax.swing.JComponent.getFontMetrics(JComponent.java:1646)
        at java.desktop/javax.swing.plaf.basic.BasicGraphicsUtils.getPreferredButtonSize(BasicGraphicsUtils.java:351)
        at java.desktop/javax.swing.plaf.basic.BasicButtonUI.getPreferredSize(BasicButtonUI.java:518)
        at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1680)
        at java.desktop/javax.swing.plaf.metal.MetalDesktopIconUI.installComponents(MetalDesktopIconUI.java:86)
        at java.desktop/javax.swing.plaf.basic.BasicDesktopIconUI.installUI(BasicDesktopIconUI.java:83)
        at java.desktop/javax.swing.JComponent.setUI(JComponent.java:685)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.setUI(JInternalFrame.java:2162)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.updateUI(JInternalFrame.java:2210)
        at java.desktop/javax.swing.JInternalFrame$JDesktopIcon.<init>(JInternalFrame.java:2142)
        at java.desktop/javax.swing.JInternalFrame.<init>(JInternalFrame.java:348)
        at the.bytecode.club.bytecodeviewer.gui.VisibleComponent.<init>(VisibleComponent.java:42)
        at the.bytecode.club.bytecodeviewer.gui.WorkPane.<init>(WorkPane.java:58)
        at the.bytecode.club.bytecodeviewer.gui.MainViewerGUI.<init>(MainViewerGUI.java:198)
        at the.bytecode.club.bytecodeviewer.BytecodeViewer.main(BytecodeViewer.java:533)

Adding the fonts-dejavu-core package to the stage-packages stanza doesn't fix the problem... :-/

[Konloch]

Would packing our own custom fonts work? I've been considering adding Noto Font support - https://fonts.google.com/noto/specimen/Noto+Sans+Mono

If we supply these fonts and load them, would this possibly resolve this error? I can build a prototype if this might resolve it. I'll do some more research on my end to attempt to fix this.

Thank you for your assistance / help in fixing this!

[brlin-tw]

Would packing our own custom fonts work?
If we supply these fonts and load them, would this possibly resolve this error?

I don't think so as snap applications should already have access to the font files in the host system, the problem smells like a packaging bug which I suspect will be resolved via #5.