MySQL Connector/J

MySQL Connector/J is the official JDBC driver for MySQL. MySQL Connector/J 8.0 is compatible with all MySQL versions starting with MySQL 5.5. MySQL Connector/J 5.1 is a JDBC Type 4 driver that is compatible with the JDBC 3.0, JDBC 4.0, JDBC 4.1, and JDBC 4.2 specifications.

The Type 4 designation means that the driver is a pure Java implementation of the MySQL protocol and does not rely on the MySQL client libraries.