FontStub.java

// This is a gross hack to make it possible to run without any fonts in the Lambda environment.
private static void configureStubFontConfiguration() {
    final Properties p = new Properties();
    p.put("version", "1");
    p.put("sequence.allfonts", "nonexistent"); // Just need at least one entry to satisfy FontManager.
    try {
        final File targetFile = File.createTempFile("fontconfig.properties", null);
        targetFile.deleteOnExit();
        try (FileOutputStream o = new FileOutputStream(targetFile)) {
            p.store(o, "stub to make sun.awt.FontConfiguration not break when no fonts are available");
        }

        System.setProperty("sun.awt.fontconfig", targetFile.getPath());
    } catch (final IOException e) {
        throw new RuntimeException(e);
    }
}