When using ‘autosetup’, this snippet from XMPPServer.java ensures that when the default authprovider mode is used, the database connection provider will always be the default provider. This prevents the usage of another database connection provider, such as the one used for the embedded database.

The effect of this is code is that when configured to use the embedded database, Openfire will typically start up initially (in which it will use the embedded database), but will fail to restart without an error (as it cannot connect to an SQL database).