JIRA inaccessible (404) after reboot if SQL server not running

JIRA and SQL Server running on separate computers. Reboot them simultaneously (e.g. to install Windows security updates). After the reboot, if JIRA starts up faster than SQL Server, JIRA may become inaccessible. Any attempt to log in results in a Apache 404 page with no hint on what might have caused the issue. Have to Stop and restart JIRA to recover.

Apparently this happens, when at the time when JIRA starts up and tries to connect to the database, SQL server is not ready yet to accept connections (Network error IOException: Connection refused: connect).

This scenario should be handled more gracefully, e.g. make retries, or at least show a 500 internal server error page indicating the problem instead of a confusing 404 page,