Netflix Feign - Propagate Status and Exception through Microservices

Question

I\'m using Netflix Feign to call to one operation of a Microservice A to other other operation of a Microservice B which validates a code using Spring Boot.

The operation

Answer 1

What we do is as follows:

Share common jar which contains exceptions with both microservices.

1.) In microservices A convert exception to a DTO class lets say ErrorInfo. Which will contain all the attributes of your custom exception with a String exceptionType, which will contain exception class name.

2.) When it is received at microservice B it will be handled by ErrorDecoder in microservice B and It will try to create an exception object from exceptionType as below:

@Override
public Exception decode(String methodKey, Response response) {       

ErrorInfo errorInfo = objectMapper.readValue(details, ErrorInfo.class);
Class exceptionClass;

Exception decodedException;

try {

    exceptionClass = Class.forName(errorInfo.getExceptionType());  

    decodedException = (Exception) exceptionClass.newInstance();

    return decodedException;

 }

 catch (ClassNotFoundException e) {

    return new PlatformExecutionException(details, errorInfo);

 }
  return defaultErrorDecoder.decode(methodKey, response);
 }