Troubleshooting the Spring Boot MySQL Connection Error in Docker Compose

Learn how to resolve the `Access denied for user 'admin'@'...'` error when using `Spring Boot` with a `MySQL` container in `Docker Compose`. This guide walks you through correct configurations and settings.
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Troubleshooting the Spring Boot MySQL Connection Error in Docker Compose

If you are working on a Spring Boot application that connects to a MySQL database running in a Docker container and encountering issues with authentication, you are not alone. Many developers face connectivity problems when setting up their containers. In this post, we will address one specific issue: the error message stating Access denied for user 'admin'@'...'. Let's dive into what might be causing this error and how to fix it.

Understanding the Problem

You might have noticed that when you try to connect your Spring Boot application to the MySQL container, it yields an error similar to this:

[[See Video to Reveal this Text or Code Snippet]]

The Cause of the Error

This error typically means that while the connection was successfully attempted, the MySQL server rejected the login attempt from the provided user credentials—in this case, the user 'admin'. The issue may stem from an incorrect or missing password for the database user in your Docker compose configuration.

Solution Overview

To resolve this issue, you need to ensure that proper credentials are set for the MySQL user during the container setup. Here's the step-by-step solution:

Step 1: Update Your Docker Compose File

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Verify Database Connection Settings in Spring Boot

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Restart Your Docker Containers

[[See Video to Reveal this Text or Code Snippet]]

This will rebuild your containers with the new configurations.

Final Thoughts

After performing the above corrections, run your Spring Boot application again. The connection issue should now be resolved, allowing you to properly connect to the MySQL database running in your Docker container.

If you follow these steps and still face problems, verify that no other service is using the database ports, and ensure that Docker is properly installed and running on your machine.

Now you can get back to building your application without connection issues. Happy coding!