镜像做好跑起来后，在里面执行java -version，会报类似如下的错误：
The command '/bin/sh -c javac -version' returned a non-zero code: 127
ENV已经加了JAVA_HOME，JAVA_HOME也已经加到PATH里去了，在容器里which java也打出正常的路径了，echo $JAVA_HOME也是正常的，但就是报java not found，好郁闷
哈哈，后来通过一篇文章找到了答案，文章来源：http://www.hackerav.com/?post=50809
You cannot achieve what you want.
Alpine Linux uses MUSL as a Standard C library.
Oracle's Java for linux depends on GNU Standard C library (gclib).
There is theoretical way, but it is not as trivial as you think.
附上，可以正常使用的Dockerfile，如下：
FROM jlesage/firefox
# desc:make the base image for xx-aa-browser project
# author: aa@xx.com
# time: 2020-04-22 10:16
COPY sgerrand.rsa.pub /etc/apk/keys/
COPY *.apk /tmp/
RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
&& sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
&& apk update \
&& apk upgrade \
&& apk add busybox-extras \
&& mkdir -p /opt/server /data/tomcat_logs \
&& apk --no-cache add ca-certificates \
&& apk add /tmp/*.apk \
&& /usr/glibc-compat/bin/localedef -i en_US -f UTF-8 en_US.UTF-8
ADD geckodriver /usr/bin/
ADD jdk1.8.0_162.tar.gz /opt/server/
ENV LC_ALL=en_US.UTF-8
ENV JAVA_HOME=/opt/server/jdk1.8.0_162
ENV CLASSPATH=$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV PATH="$JAVA_HOME/bin:${PATH}"
EXPOSE 8080
基于jlesage/firefox镜像的原因是因为java项目里要调用firefox内核，所以jdk是自己加上去的，一开始没注意到我们公司使用的jdk是oracle jdk。
jlesage/firefox镜像是基于alpine的。
Dockerfile文件所在目录的文件如下：
[root@8d224-docker browser-base]# ll
total 270736
-rw-r--r--. 1 root root 904 Apr 28 23:02 Dockerfile
-rwxr-xr-x. 1 root root 7008696 Oct 12 2019 geckodriver
-rwxr-xr-x. 1 root root 4412098 Apr 28 21:09 glibc-2.31-r0.apk
-rwxr-xr-x. 1 root root 1007404 Apr 28 22:00 glibc-bin-2.31-r0.apk
-rwxr-xr-x. 1 root root 7713411 Apr 28 21:13 glibc-i18n-2.31-r0.apk
-rw-r--r--. 1 root root 189682037 Apr 22 17:26 jdk1.8.0_162.tar.gz
-rw-r--r--. 1 root root 451 Apr 28 21:54 sgerrand.rsa.pub
参考资料：
https://github.com/sgerrand/alpine-pkg-glibc
http://www.hackerav.com/?post=50809
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