How to Fix \'Communications Link Failure\' Errors When Using Spring Boot, Hibernate, and MySQL Docker?

Fixing "Communications link failure" Error in Spring Boot, Hibernate & MySQL Docker Setup**

While running a Spring Boot application with Hibernate & MySQL in a dockerized environment, users may encounter the "Communications link failure" error due to localhost reference in the JDBC URL. Here's how to address this issue:

Problem:

The error occurs because the JDBC URL in the application code references "localhost" as the database host. However, in the Docker setup, the MySQL database is running in a separate container with a different IP address.

Solution:

To resolve this issue, update the JDBC URL in the docker-compose.yml file to point to the MySQL container's name instead of "localhost":

docker-compose.yml

version: '3'

services:
  docker-mysql:
    image: mysql:5.7
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=database
      - MYSQL_USER=root
      - MYSQL_PASSWORD=root
    ports:
      - 3307:3306

  app:
    image: app:latest
    ports:
       - 8091:8091
    environment:
      SPRING_DATASOURCE_URL: jdbc:mysql://docker-mysql:3306/database?autoReconnect=true&useSSL=false
    depends_on:
       - docker-mysql

Explanation:

In the updated docker-compose.yml file, the SPRING_DATASOURCE_URL environment variable in the "app" container is set to refer to the MySQL container by its name, "docker-mysql." This ensures that the application can connect to the MySQL database container correctly.

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