Spring Rest Client 希望看到错误消息而不是异常

Question

I have a spring rest client. when authentication details are not provided in the headers and I hit the service with

ResponseEntity<String> resp = restTemplate.exchange(url, HttpMethod.GET, request, String.class);

I get exception :

invoking error handler Exception in thread "main" org.springframework.web.client.HttpClientErrorException: 401 Unauthorized at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)

But when I hit the url on mozilla browser, I get message like

{"errors":[{"code":"xxxx","reason":"xxxx"}]}

Now here is what i want: i want to capture this error message in my code instead of getting 401 exception . I tried to see if there is anything in the response. But the response received is null. How can I capture the error message received from the webservice ?

Answer 1

I feel odd to post answer for my own question. But i finally achieved it through the following...

} catch (HttpClientErrorException e) {
      System.out.println(e.getStatusCode());
      System.out.println(e.getResponseBodyAsString());
    }

I was incorrectly searching for errors in response entity. But it is available in the exception.

Answer 2

If you use a global exception handler add the below method or check this

https://www.javaguides.net/2018/09/spring-boot-2-exception-handling-for-rest-apis.html add below method in GlobalExceptionHandler class

@ExceptionHandler({HttpClientErrorException.class, HttpStatusCodeException.class, HttpServerErrorException.class})
    @ResponseBody
    public ResponseEntity<Object> httpClientErrorException(HttpStatusCodeException e) throws IOException {
        BodyBuilder bodyBuilder = ResponseEntity.status(e.getRawStatusCode()).header("X-Backend-Status", String.valueOf(e.getRawStatusCode()));
        if (e.getResponseHeaders().getContentType() != null) {
            bodyBuilder.contentType(e.getResponseHeaders().getContentType());
        }
        return bodyBuilder.body(e.getResponseBodyAsString());
    }