Captcha生成验证码，docker部署时问题

https://blog.csdn.net/huofuman960209/article/details/100738712

Dockerfile

FROM openjdk:8-jdk-alpine
VOLUME /tmp
##时区
RUN echo "Asia/Shanghai" > /etc/timezone

#captcher 字体包
RUN set -xe \
&& apk --no-cache add ttf-dejavu fontconfig

ADD love-master-0.0.1-SNAPSHOT.jar love-master.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/love-master.jar"]

openjdk:8-jdk-alpine 没有相关字体包，调用createImage()方法时，会报空指针异常，此处已经指定docker容器安装字体包