Run Mysql in a docker container with Spring Boot - mysql

Question

I am trying to change my embedded in-memory H2 database to a MySQL instance using docker.
The application runs fine in-memory using docker, but I can't manage to change to MySQL.
I did some research, and managed to write this docker-compose.yml:
version: '3.3'
services:
#service 1: definition of mysql database
db:
image: mysql:latest
container_name: mysql-db2
environment:
- MYSQL_ROOT_PASSWORD=sa
- MYSQL_USER=password
ports:
- "3306:3306"
#service 2: definition of phpMyAdmin
phpmyadmin:
image: phpmyadmin/phpmyadmin:latest
container_name: my-php-myadmin
ports:
- "8082:80"
restart: always
depends_on:
- db
environment:
SPRING_DATASOURCE_USERNAME: sa
SPRING_DATASOURCE_PASSWORD: password
#service 3: definition of the spring-boot app
customerservice:
image: mysqldockerapp
container_name: mysql-docker-app
build:
context: .
dockerfile: Dockerfile
ports:
- "8084:8084"
depends_on:
- db
environment:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql-db2:3306/customer?createDatabaseIfNotExist=true
SPRING_DATASOURCE_USERNAME: sa
SPRING_DATASOURCE_PASSWORD: password
And these are my application.properties
server.port=8084
spring.application.name=customer-service
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://mysql-db2:3306/customer?createDatabaseIfNotExist=true&useSSL=false&serverTimezone=UTC
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.hibernate.naming.implicit-strategy=org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
spring.jpa.hibernate.ddl-auto=update
spring.datasource.initialization-mode=never
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE
logging.level.org.hibernate.SQL=DEBUG
And my dockerfile
FROM openjdk:16-alpine3.13
MAINTAINER krzysztof.com
EXPOSE 8084
COPY target/myapp.jar myapp.jar
ENTRYPOINT ["java","-jar","/myapp.jar"]
The containers build correctly, but the app exits and I get:
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
But the MySQL container is running, so I would appreciate any tips where should I look for possible reasons.