How to reproduce error

1. Run Application with configuration.yml
2. Wait for start of Application.
3. Run ErrorTrigger. You should see some number of 500 errors, but expected is 503.

The potential reason

Mapper GenericJDBCExceptionMapper is properly registered in Jersey, but exceptions from UnitFromWorkAspect are not wrapper with MappableException and are not mapped to the response from mapper.

The method process in the class ServerRuntime$Responder (line 476) cannot map not-mappable exception and default 500 is generated.