My Hystrix/Feign
app makes calls to other web services.
I would like to propagate error codes/messages from these web services.
I implemented ErrorDecoder
, which correctly decodes exceptions returned and rethrow them.
Unfortunately these Exceptions are wrapped by HystrixRuntimeException
and the JSON
returned in not what I want (generic error message, always 500 http status).
Most likely I need an ExceptionMapper
, I created one like this:
@Provider
public class GlobalExceptionHandler implements
ExceptionMapper<Throwable> {
@Override
public Response toResponse(Throwable e) {
System.out.println("ABCD 1");
if(e instanceof HystrixRuntimeException){
System.out.println("ABCD 2");
if(e.getCause() != null && e.getCause() instanceof HttpStatusCodeException)
{
System.out.println("ABCD 3");
HttpStatusCodeException exc = (HttpStatusCodeException)e.getCause();
return Response.status(exc.getStatusCode().value())
.entity(exc.getMessage())
.type(MediaType.APPLICATION_JSON).build();
}
}
return Response.status(500).entity("Internal server error").build();
}
}
Unfortunately this code is not being picked-up by my application (debug statements are not visible in logs).
How could I register it with my Application?
I couldn't make use of an ExceptionMapper
.
I solved this problem using ResponseEntityExceptionHandler
.
Here is the code:
@EnableWebMvc
@ControllerAdvice
public class ServiceExceptionHandler extends ResponseEntityExceptionHandler {
@ExceptionHandler(HystrixRuntimeException.class)
@ResponseBody
ResponseEntity<String> handleControllerException(HttpServletRequest req, Throwable ex) {
if(ex instanceof HystrixRuntimeException) {
HttpStatusCodeException exc = (HttpStatusCodeException)ex.getCause();
return new ResponseEntity<>(exc.getResponseBodyAsString(), exc.getStatusCode());
}
return new ResponseEntity<String>(ex.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
}
}
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