After taking over a coworker's project I noticed he was using "org.gjt.mm.mysql.Driver" as the jdbc driver for MySQL 5 instead of the more common one "com.mysql.jdbc.Driver". They both are contained in the driver I found on Maven central that appears to be the standard distribution of the driver.
When I look up gjt.org I found some old site that talks about "Mark's mysql driver".
The MySQL JDBC driver was initially developed by a hobbyist. It's later donated to MySQL where they renamed the package/classname. The old classname is kept for backwards compatibility reasons, but if you can, you should update it to com.mysql.jdbc.Driver as soon as possible.
来源：https://stackoverflow.com/questions/5808160/what-is-the-jdbc-driver-org-gjt-mm-mysql-driver-for