After configuring Confluence with MySQL v8, getting INFO message about deprecated JDBC Driver
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Summary
When upgrading the Confluence repository to MySQL v8 or when configuring a new Confluence environment with MySQL v8, you may get a INFO message related to the MySQL Driver used. =
Do note that starting with Confluence 8, MySQL 5.7 is not part of the Supported Platforms anymore.
Environment
Confluence 7.19.X or Confluence 8.X running with MySQL v8
Diagnosis
In the atlassian-confluence.log files you will notice the following message while starting Confluence:
2021-08-26 14:57:06,204 INFO [Catalina-utility-1] [atlassian.confluence.cluster.DefaultClusterConfigurationHelper] lambda$populateExistingClusterSetupConfig$5 Populating setup configuration if running with Cluster mode...
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.Cause
MySQL changed the API Connector/J driver from com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver. This is documented by MySQL itself under MySQL Connector Developer Guide > 4.4.1.3 Changes in the Connector
The name of the class that implements java.sql.Driver in MySQL Connector/J has changed from com.mysql.jdbc.Driver to com.mysql.cj.jdbc.Driver. The old class name has been deprecated.
Solution
To avoid these messages, you need to change the JDBC Driver name in your confluence.cfg.xml as described in our documentation Configuring a datasource connection:
...
...
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
...
...Please, restart Confluence after this change is implemented.