Why Does My MySQL Connection Fail with 'Client does not support authentication protocol requested by server,' and How Can I Fix It?

Error: Client does not support authentication protocol requested by server – Upgrading MySQL client is Essential

Connecting to a database can sometimes bring unexpected errors, as encountered with the issue "Client does not support authentication protocol requested by server." This error emerges when attempting to connect to a MySQL database using JDBC, primarily due to a compatibility issue between the MySQL client and the server's authentication protocol.

The core reason lies in MySQL 8 introducing caching_sha2_password as its new authentication mechanism, while older versions of MySQL Connector/J (prior to 5.1.46) do not support this protocol. Resolving this issue requires upgrading to a compatible version of the MySQL Connector/J, such as 5.1.46 or higher.

However, upgrading to the latest version (8.0.15) is highly recommended, as it provides optimal compatibility with recent MySQL server versions and features. It is easily accessible from the MySQL Connector/J download page (https://dev.mysql.com/downloads/connector/j/), where you can manually download the relevant package or include the dependency in your project's build configuration (e.g., Maven/Gradle).

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