MySQL Connectivity Exception: How to Fix 'Could Not Create Connection to Database Server'?

MySQL Connectivity Exception: Could Not Create Connection to Database Server

Problem Description:

While attempting to connect to a MySQL database from Java, you may encounter the exception:

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

This exception occurs when trying to establish a connection using older versions of MySQL Connector/J with MySQL 8.

Solution:

To resolve this issue, it is necessary to upgrade to either MySQL Connector/J 5.1.46 or MySQL Connector/J 8.0.11 (recommended). Here's how you can upgrade:

1. Uninstall the existing MySQL Connector/J by removing it from your classpath.

2. Download the latest compatible MySQL Connector/J version from the official website:

   • For version 5.1.46: https://dev.mysql.com/downloads/file/?id=490974
   • For version 8.0.11: https://dev.mysql.com/downloads/file/?id=605127
3. Add the downloaded JAR file to your classpath.
4. Restart your Java application.

By upgrading to a compatible version of MySQL Connector/J, you can ensure a successful connection to your MySQL 8 database.

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