Some devices do not have the Linux fontconfig package, which, by default, JavaFX uses to find fonts. The fontconfig package is not installed if the following command returns no result:
$ find /usr/lib -name libfontconfig.so -o -name libfontconfig.so.1
Fontconfig provides for a powerful means of identifying and finding installed fonts. It is usually associated with X11, but does not require it.
On the target device that does not have fontconfig,it is possible to configure JavaFX to find and use fonts. Follow these steps to set up fonts for JavaFX. The fonts used in the examples can be found in a full JDK distribution under ./jre/lib/fonts
翻译一下
OpenJDK 使用 fontconfig 寻找字体，如果没有该 package, 你可以配置 JavaFX 来进行查找和使用字体。