8u111-jdk-alpine 字体缺少FontConfiguration的NullPointerException错误解决方案

1、异常

　　

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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)     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)     at java.lang.reflect.Constructor.newInstance(Constructor.java:423)     at java.lang.Class.newInstance(Class.java:442)     at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)     at java.security.AccessController.doPrivileged(Native Method)     at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)     at java.awt.Font.getFont2D(Font.java:491)     at java.awt.Font.access$000(Font.java:224)     at java.awt.Font$FontAccessImpl.getFont2D(Font.java:228)     at sun.font.FontUtilities.getFont2D(FontUtilities.java:180)     at sun.font.StandardGlyphVector.initFontData(StandardGlyphVector.java:1126)     at sun.font.StandardGlyphVector.init(StandardGlyphVector.java:1115)     at sun.font.StandardGlyphVector.<init>(StandardGlyphVector.java:167)     at java.awt.Font.createGlyphVector(Font.java:2545)     at nl.captcha.text.renderer.DefaultWordRenderer.render(Unknown Source)     at nl.captcha.Captcha$Builder.addText(Unknown Source)     at com.liferay.portal.captcha.simplecaptcha.SimpleCaptchaImpl.getSimpleCaptcha(SimpleCaptchaImpl.java:243)     at com.liferay.portal.captcha.simplecaptcha.SimpleCaptchaImpl.serveImage(SimpleCaptchaImpl.java:159)     at com.liferay.portal.captcha.CaptchaImpl.serveImage(CaptchaImpl.java:100)     at com.liferay.portal.kernel.captcha.CaptchaUtil.serveImage(CaptchaUtil.java:78)     at com.liferay.portal.captcha.CaptchaPortletAction.serveResource(CaptchaPortletAction.java:42)

　　2、解决，在dockerFile中添加

　　　　

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# 缺少的字体 RUN echo -e "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main\n\ https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/community" > /etc/apk/repositories   RUN apk --update add curl bash ttf-dejavu && \       rm -rf /var/cache/apk/*

　　3、结果