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Installing the non-headless version of a JRE should include everything needed to run applications in non-headless modes. This mainly affects drawing / printing applications using jfreechart or batik. This is not the case with current java packages in alpine, but also affects other vendors like AdoptOpenJDK (https://github.com/AdoptOpenJDK/openjdk-docker/issues/75).

The stacktrace differes between Java-Version, but looks like this:

Caused by: java.lang.NullPointerException
	at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)
	at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)
	at sun.awt.FontConfiguration.init(FontConfiguration.java:107)
	at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:774)
	at sun.font.SunFontManager$2.run(SunFontManager.java:431)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.font.SunFontManager.<init>(SunFontManager.java:376)
	at sun.awt.FcFontManager.<init>(FcFontManager.java:35)
	at sun.awt.X11FontManager.<init>(X11FontManager.java:57)

and
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)

The error can be reproduced with the following class:

import java.awt.image.BufferedImage;

public class Test {
    public static void main(String[] args) {
        BufferedImage image = new BufferedImage(10, 10, BufferedImage.TYPE_INT_RGB);
        System.out.println(image.getGraphics());
    }
}

The issue can be fixed quite easily by installing a font. But as this error is not intuitive we should install some font by default wehn installing the JRE.

• openjdk7
• openjdk8 (!13758 (closed))
• openjdk9
• openjdk10
• openjdk11
• openjdk12
• openjdk13
• openjdk14
• openjdk15