What the error means
The application is unable to connect to the database.
👉 This is typically caused by a PostgreSQL outage or unavailability.
How the problem manifests
The following may appear in the log, for example:
class java.sql.SQLException:
Connections could not be acquired from the underlying database!
If applicable, pass this information on to your server administrator.
Possible causes
the database service is not running
the connection was interrupted (network issue, server restart)
the database is overloaded or not responding
available connections have been exhausted
How to resolve the issue
Verify that the database (PostgreSQL) is running
Check server availability (network, port)
Review the server / PostgreSQL logs
if necessary, restart the Flexi service / database