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Headless Java servers fail silently when fonts are missing from production images

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Java services that render text to images or documents depend on fonts installed on the host, a dependency developers often overlook. Slim base images typically omit fontconfig and freetype, and the headless flag does not remove the need for them because AWT still loads font files when drawing text. Missing libraries produce cryptic errors like UnsatisfiedLinkError or NullPointerException, sometimes only on the first rendering request after deployment. The Font constructor also silently falls back to the Dialog family when a named font is absent, which causes text metrics and layouts to differ across machines. The article recommends explicitly installing fontconfig and fonts in the Docker image, logging available font families at startup, and bundling a font file with the application for consistent output.

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Headless Java servers fail silently when fonts are missing from production images · ShortSingh