Not useable with OpenJDK 11 or newer

[michaelzangl]

Caused by: java.lang.NoClassDefFoundError: Could not initialize class sun.font.SunFontManager
	at java.desktop/sun.font.FontDesignMetrics.getMetrics(Unknown Source)
	at java.desktop/sun.java2d.SunGraphics2D.getFontMetrics(Unknown Source)
	at com.github.bingoohuang.patchca.text.renderer.AbstractTextRenderer.convertToCharacters(AbstractTextRenderer.java:86)
	at com.github.bingoohuang.patchca.text.renderer.AbstractTextRenderer.draw(AbstractTextRenderer.java:67)
	at com.github.bingoohuang.patchca.service.AbstractCaptchaService.getCaptcha(AbstractCaptchaService.java:112)
...