Get error msg from ResponseStatusException with ResponseErrorHandler - spring-boot

Question

I have an API which throws ResponseStatusException in case of error :
throw new ResponseStatusException(HttpStatus.NOT_FOUND, "My error msg");
In the client side I have :
RestTemplate restTemplate = this.builder.errorHandler(new RestTemplateResponseErrorHandler()).build();
// Then I use restTemplate to call URLs with restTemplate.exchange(...)
And the 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 {
String error = new String(httpResponse.getBody().readAllBytes(), StandardCharsets.UTF_8);
}
}
Problem is the getBody() is empty, and when I inspect the httpResponse I cannot find the "My error msg", it seems that it's not present in the object.
Is there any way to get the msg?
Thx

Answer 1

You need to build the RestTemplate instance using the RestTemplateBuilder like this:
public class xyz {
RestTemplate restTemplate;
#Autowired
public xyz(RestTemplateBuilder restTemplateBuilder) {
restTemplate = restTemplateBuilder
.errorHandler(new RestTemplateResponseErrorHandler())
.build();
}
}

Answer 2

Catch HttpClientErrorException as follows:
try{
HttpEntity<ProfileDto> entity = new HttpEntity<ProfileDto>(profileDto,headers);
response= restTemplate.postForEntity(environment.getProperty("app.filedownload.url"),entity, xxxxxx.class);
}catch(HttpClientErrorException | HttpServerErrorException e ){
if(HttpStatus.UNAUTHORIZED.equals(e.getStatusCode())){
//do your stufs
}
}catch(Exception e){
e.printStackTrace();
}