The SQL for Confluence (Pro Edition) app version 11.x has removed the support for application server-defined data sources in Confluence 8.x. (Atlassian has ended support for the data source connections in Confluence 8.0. For more information, refer to Configuring a data source connection.)
In Confluence 8.x, we recommend reconfiguring the application server-defined data source profile to the connection string profile. For more information, refer to How to convert an application server defined data source profile to a connection string profile.
SQL for Confluence (Pro Edition) app version 11.x works seamlessly with Confluence 7.x (Confluence 7.4 to Confluence 7.20) versions, including support for application server-defined data sources (JNDI data source connections).