The following is called in whichever is called first in a given request of onApplicationStart, onSessionStart, and onRequestStart. The server has no settings at all defined in the administrator.
A dump of application.datasources immediately prior to the Application call shows the following ( apologies for the MS Paint skills )
The result is the following error
This identical code sample + data structure works on Lucee 4.x, but causes the error above in Lucee 5 ( last tested on Lucee 220.127.116.11-SNAPSHOT but also seen in the RC )