Create Docker file for run jar application | MySQL as a DB

Docker Desktop
,
1

I am new in docker but my requirement is to create a docker file to run my java application (.jar file) which have connected with mysql.

My Docker file is :

FROM openjdk:8

MAINTAINER XYZ
ENV HOME /home/springboot
WORKDIR /home/springboot/sample
 
ADD target/springbootmysql-0.0.1-SNAPSHOT.jar springbootmysql.jar

CMD ["java", "-jar", "springbootmysql.jar"]

FROM mysql:5.7

ENV MYSQL_USER=USER1
ENV MYSQL_PASSWORD=user@123
ENV MYSQL_DATABASE="test_db" \
    MYSQL_DATA_DIR=/var/lib/mysql \
    MYSQL_RUN_DIR=/run/mysqld \
    MYSQL_LOG_DIR=/var/log/mysql
   
    
    
#USER root

COPY mysqldemo.sql /docker-entrypoint-initdb.d/

RUN /etc/init.d/mysql start && mysql -u root  -e "CREATE USER $MYSQL_USER@'localhost' IDENTIFIED BY 'global@123';GRANT ALL PRIVILEGES ON *.* TO $MYSQL_USER@'localhost' WITH GRANT OPTION; FLUSH PRIVILEGES;" && mysql -u $MYSQL_USER -p 'global@123' $MYSQL_DATABASE  < /docker-entrypoint-initdb.d/mysqldemo.sql

EXPOSE 9999 3306/tcp

after running following commands over docker -
$docker build . -t sample:1
It successfully created the image file .
$docker images

REPOSITORY          TAG       IMAGE ID           CREATED         SIZE
<none>              <none>    049063703a96       A minute ago   372MB
<none>              <none>    735cd7af5738       A minute ago   757MB
mysql               5.7       0164c13b662c       6 days ago     372MB
openjdk             8         891c9734d5ab       5 weeks ago    726MB

sample image is not showing …??
As per the requirement need to create a single dockerfile which will manage build all the required images and finally we can able run our project.