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

Since 2017 we've created a library that does this from annotations (making it fairly easy to, just like for requests/etc, to code this up by annotations).

it basically allows you to code error handling as follows:

@ErrorHandling(codeSpecific =
    {
        @ErrorCodes( codes = {401}, generate = UnAuthorizedException.class),
        @ErrorCodes( codes = {403}, generate = ForbiddenException.class),
        @ErrorCodes( codes = {404}, generate = UnknownItemException.class),
    },
    defaultException = ClassLevelDefaultException.class
)
interface GitHub {

    @ErrorHandling(codeSpecific =
        {
            @ErrorCodes( codes = {404}, generate = NonExistentRepoException.class),
            @ErrorCodes( codes = {502, 503, 504}, generate = RetryAfterCertainTimeException.class),
        },
        defaultException = FailedToGetContributorsException.class
    )
    @RequestLine("GET /repos/{owner}/{repo}/contributors")
    List contributors(@Param("owner") String owner, @Param("repo") String repo);
}

You can find it in the OpenFeign organisation: https://github.com/OpenFeign/feign-annotation-error-decoder

disclaimer: I'm a contributor to feign and the main dev for that error decoder.