Fallback throwing exception - Question

[David Macháček]

Hello,

how can I implement fallback throwing exception in classic MVC architecture with ExceptionHandling Controller?

@HystrixCommand(commandKey = COMMAND_KEY, fallbackMethod = "inquiryFallback")
public RegistryResponse inquiry(String pancardNumber) { /* do stuff */ }

public RegistryResponse inquiryFallback(String panCardNumber, Throwable e) throws RegistryError {        
    throw RegistryError.of(
            new ErrorTO(ERR_PAN_0001_PANREGISTRY_NOT_AVAILABLE,
                    "PanRegistry",
                    "Cannot access pan card registry for panCardNumber '" + panCardNumber));} x

After several failures I always end up with exception like following (instead of RegistryError) and returning 500 with java.lang.RuntimeException: Hystrix circuit short-circuited and is OPEN

{

    "timestamp": "2018-02-21T14:28:21.707+0000",

    "status": 500,

    "error": "Internal Server Error",

    "message": "inquiry short-circuited and fallback failed.",

    "path": "/panCards/ABCPD1234T/registryValidation"

}

But after I want to keep throwing RegistryError (set as 503) using 

@ExceptionHandler(RegistryError.class)
    @ResponseStatus(code = HttpStatus.SERVICE_UNAVAILABLE)
    public List<ErrorTO> handleServerException(RegistryError e) {
        sLog.debug("action='accessRegistry', code='{}', attribute='{}', message='{}'", e.getError().getCode(), e.getError().getAttribute(), e.getError().getMessage());
        return Collections.singletonList(e.getError());
    }

ignoreExceptions = RegistryError.class at fallback doesnt help.

Thanks!!