Spring RestTemplate throws always Exception if Http status is 500

Question

Is it possible to use Spring RestTemplate without using Exceptions to handle http response with status 500?

        RestTemplate restTemplate = new RestTemplate();
        try {
            response = restTemplate.getForEntity(probe.getUrl(), String.class);
            boolean isOK = response.getStatusCode() == HttpStatus.OK;
            // would be nice if 500 would also stay here
        }
        catch (HttpServerErrorException exc) {
            // but seems only possible to handle here...
        }

How would you handle exception without catch? What are you trying to exactly pull off? — We are Borg, Jul 30 '15 at 15:37

score 5 · Accepted Answer · answered Sep 22 '16 at 12:09

You can create a controller using annotation @ControllerAdvice if you using springmvc. In the controller write:

@ExceptionHandler(HttpClientErrorException.class)
public String handleXXException(HttpClientErrorException e) {
    log.error("log HttpClientErrorException: ", e);
    return "HttpClientErrorException_message";
}

@ExceptionHandler(HttpServerErrorException.class)
public String handleXXException(HttpServerErrorException e) {
    log.error("log HttpServerErrorException: ", e);
    return "HttpServerErrorException_message";
}
...
// catch unknown error
@ExceptionHandler(Exception.class)
public String handleException(Exception e) {
    log.error("log unknown error", e);
    return "unknown_error_message";
}

and the DefaultResponseErrorHandler throw these two kinds of exceptions:

@Override
public void handleError(ClientHttpResponse response) throws IOException {
    HttpStatus statusCode = getHttpStatusCode(response);
    switch (statusCode.series()) {
        case CLIENT_ERROR:
            throw new HttpClientErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        case SERVER_ERROR:
            throw new HttpServerErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        default:
            throw new RestClientException("Unknown status code [" + statusCode + "]");
    }
}

and you can use:e.getResponseBodyAsString();，e.getStatusCode(); blabla in the controller advice to get response message when the exceptions occurs.

@Mike.Chun This should be in the Controller class annotated with ControllerAdvice — Qy Zuo, Mar 31 '17 at 07:32

score 3 · Answer 2 · answered Jul 30 '15 at 16:17

3

Not tested, but you could simply use a custom ResponseErrorHandler that is not a DefaultResponseErrorHandler, or that extends DefaultResponseErrorHandler but overrides hasError().

answered Jul 30 '15 at 16:17

JB Nizet

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Spring RestTemplate throws always Exception if Http status is 500

2 Answers2