Connection Refused when initializing Hibernate with MySQL in docker-compose

I have a docker-compose for a SpringBoot application with Hibernate and MySQL 8 server. But whenever my MySQL server and SpringBoot application are being brought up by docker-compose, I get:

HHH000342: Could not obtain connection to query metadata : Communications link failure
...
Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: 
Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to open JDBC Connection for DDL execution
...
Caused by: java.net.ConnectException: Connection refused

And here is my docker-compose.yaml:

version: '3'
services:
  my-account-microservice-db:
    container_name: my-account-microservice-db
    volumes:
      - /Users/syu/Desktop/my-mysql/storage/my-account-microservice-db:/var/lib/mysql
    image: mysql:8.0.19
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: my-account
    ports:
      - "3307:3306"
    networks:
      - my-network

  my-account-microservice:
    container_name: my-account-microservice
    image: my-account-microservice
    build:
      context: ./account-microservice
    environment:
      SPRING_DATASOURCE_URL: jdbc:mysql://my-account-microservice-db:3307/my-account
      SPRING_DATASOURCE_USERNAME: root
      SPRING_DATASOURCE_PASSWORD: password
      SPRING_DATASOURCE_DRIVER-CLASS-NAME: com.mysql.cj.jdbc.Driver
      # SPRING.DATASOURCE.URL: jdbc:mysql://my-account-microservice-db:3307/my-account
      # SPRING.DATASOURCE.USERNAME: root
      # SPRING.DATASOURCE.PASSWORD: password
      # SPRING.DATASOURCE.DRIVER-CLASS-NAME: com.mysql.cj.jdbc.Driver
      # DATABASE_HOST: my-account-microservice-db
      # DATABASE_USER: root
      # DATABASE_PASSWORD: password
      # DATABASE_PORT: 3307
    depends_on:
      - my-account-microservice-db
    ports:
      - "8090:8090"
    networks:
      - my-network
#    links:
#      - my-account-microservice-db:database

networks:
  my-network:

And my application.properties:

spring.application.name=account-microservice

server.port=8090

# ==============================================================
# = Data Source
# ==============================================================
# ******** Will probably put this on a central config server? would that work?
spring.datasource.url = jdbc:mysql://localhost:3307/my-account
spring.datasource.username = root
spring.datasource.password = password
spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver

# ==============================================================
# = Show or not log for each sql query
# ==============================================================
spring.jpa.show-sql = true

# ==============================================================
# = Keep the connection alive if idle for a long time (needed in production)
# ==============================================================
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

# ==============================================================
# = Hibernate ddl auto (create, create-drop, update)
# = The SQL dialect makes Hibernate generate better SQL for the chosen database
# ==============================================================
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl = true
spring.jpa.hibernate.ddl-auto = update

I have verified the following things:

1. MySQL is up before the SpringBoot application is up
2. Tried using -links, but didn’t work
3. Nothing is using port 3307
4. I am able to connect to localhost:3307 with /bin/mysql -h0.0.0.0 -uroot -ppassword perfectly fine
5. Having them on the same network
6. Restarting Docker
7. Make sure root user has privilege by running GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' on the server
8. Running with individual DockerFiles
9. Having correct mysql connector and Hibernate dependencies

But all the things I have tried above did not work.


*The weird thing is though, my SpringBoot application is able to connect to the mysql database if I just start the app by itself without using Docker (just using IntelliJ’s SpringBoot config)

I have no idea what I am doing wrong. Please help ^

Source: StackOverflow