Error not getting propagated from called service to caller service

Question

We have 2 services which have REST controllers.

Caller Service calls like:

try {
            response = restTemplate.exchange(urlModifyAttributes, HttpMethod.PUT, new HttpEntity<>(attributesMap, headerMap), parameterizedTypeReference, uriVars);
            return response.getBody();
        } catch (RestClientResponseException e) {
            log.error("Modify attributes failed. Error {}", e.getMessage(), e);
            throw new RuntimeException(e.getMessage());
        } catch (Exception e) {
            log.error("Modify attributes failed. Error: {}", e.getMessage(), e);
            throw new RuntimeException(e.getMessage());
        }

While the called service throws a RuntimeException like:

throw new RuntimeException("Already modified");

But the caller service is not able to capture the error message "Already modified" using e.getMessage() . Rather e.getMessage() is returning something like "I/O error on PUT request for http....... " Is there a way by which I can capture the error message at the caller service level?

Both services are SpringBoot Applications and have RestControllers

Answer 1

You are handling exception in caller service but in called service it need to send the exception as well. For generic u can refer this or have your own custom impl.

called service:

@Getmapping("/uri")
public ResponseEntity<Object> getIt(@RequestBody MyRequest req) {
try{
//...business logic

    return new ResponseEntity<>(response, HttpStatus.OK);

}catch(MyException e){
    return new ResponseEntity<>(e, HttpStatus.SOME_EXC_STATUS); //or custom exc
}catch(Exception e){
    return new ResponseEntity<>(e, HttpStatus.SOME_EXC_STATUS);
}
}

Then only you will be able to get exception status.

Answer 2

The called service needs to send this in the response. You are making a rest call. Had it been a method, you could have caught it from caller too.

In the response entity of the called service pass the exception message. Either using controller advice or responsestatusexception.