java.lang.NullPointerException: null 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 

jdk8 和jdk11报错的方式上面，jdk11 报错还有报错方式下面

解决

dockefile里加一行解决；RUN apk add --update font-adobe-100dpi ttf-dejavu fontconfig 

或者centos的镜像安装宋体

先百度下载宋体或者本机win复制：simsun.ttf

RUN yum install fontconfig -y 
COPY ./simsun.ttf /usr/share/fonts/simsun.ttf
RUN fc-cache -vf