ResourceAccessException received instead HttpServerErrorException - rest

Question

I have invoked rest Api in my microservice using RestTemplate. However incase of exceptions i have returned error data with HTTP response code as 500. But when i receive this response in my microservice , it is received as ResourceAccessException instead of HttpServerErrorException. Hence i lose the response body which i returned in my rest API. Spring web is of version 5.2.5

Answer 1

Add below component
import java.io.IOException;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.HttpServerErrorException;
import org.springframework.web.client.ResponseErrorHandler;
#Component
public class RestTemplateResponseErrorHandler implements ResponseErrorHandler {
#Override
public boolean hasError(ClientHttpResponse httpResponse) throws IOException {
return (httpResponse.getStatusCode().series() == HttpStatus.Series.CLIENT_ERROR
|| httpResponse.getStatusCode().series() == HttpStatus.Series.SERVER_ERROR);
}
#Override
public void handleError(ClientHttpResponse httpResponse) throws IOException {
if (httpResponse.getStatusCode().series() == HttpStatus.Series.SERVER_ERROR) {
throw new HttpServerErrorException(HttpStatus.SERVICE_UNAVAILABLE);
} else if (httpResponse.getStatusCode().series() == HttpStatus.Series.CLIENT_ERROR) {
throw new HttpClientErrorException(HttpStatus.UNAUTHORIZED);
}
}
}
And handle exception like below while calling API
ResponseEntity<Object> res = null;
try {
res = restTemplate.exchange(completeUrl, HttpMethod.GET, null, Object.class);
if (res.getStatusCodeValue() == HttpStatus.OK.value()) {
}
} catch (HttpServerErrorException e) {
} catch (HttpClientErrorException e) {
}

Answer 2

The reason why you are getting this ResourceAccessException may be because you are using BufferingClientHttpRequestFactory. Without a full stack trace, I cannot be sure.
Look here for more details:
Throwing ResourceAccessException vs HttpClientErrorException for RestTemplate client in Spring