Spring MVC - RestTemplate launch exception when http 404 happens

Question

I have a rest service which send an 404 error when the resources is not found. Here the source of my controller and the exception which send Http 404.

@Contr         


        

Answer 1

You can create your own RestTemplate wrapper which does not throw exceptions, but returns a response with the received status code. (You could also return the body, but that would stop being type-safe, so in the code below the body remains simply null.)

/**
 * A Rest Template that doesn't throw exceptions if a method returns something other than 2xx
 */
public class GracefulRestTemplate extends RestTemplate {
    private final RestTemplate restTemplate;

    public GracefulRestTemplate(RestTemplate restTemplate) {
        super(restTemplate.getMessageConverters());
        this.restTemplate = restTemplate;
    }

    @Override
    public  ResponseEntity getForEntity(URI url, Class responseType) throws RestClientException {
        return withExceptionHandling(() -> restTemplate.getForEntity(url, responseType));
    }

    @Override
    public  ResponseEntity postForEntity(URI url, Object request, Class responseType) throws RestClientException {
        return withExceptionHandling(() -> restTemplate.postForEntity(url, request, responseType));
    }

    private  ResponseEntity withExceptionHandling(Supplier> action) {
        try {
            return action.get();
        } catch (HttpClientErrorException ex) {
            return new ResponseEntity<>(ex.getStatusCode());
        }
    }
}