Having an error in setup/settings for Elytron jdbc-realm, e.g. there is missing a DB table required by SQL query used by the realm, there are no error (nor trace) messages in server log, and debugging of org.wildfly.security.auth.realm.jdbc.JdbcSecurityRealm have to be used currently to find out why the server returns status code 500 for an authenticated request.

This issue is just an example, there are more such issues. rhn-support-dlofthouse clarified that the exceptions, like the throw log.couldNotExecuteQuery(sql, e); are not logged by default to avoid repeated logging. On the other hand, users should be able to investigate such errors without huge effort.