Spring RestTemplate wont use timeout settings

Question

Having a problem with understanding how RestTemplate handles timeouts.

I configured RestTemplate as a Bean as shown:

@Bean
public RestTemplate rest(final RestTemplateBuilder builder) {
    final RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
    return restTemplate;
}

private ClientHttpRequestFactory getClientHttpRequestFactory() {
    final int timeout = 50000;
    final RequestConfig config = RequestConfig.custom().setConnectTimeout(timeout).setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build();
    final CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
    return new HttpComponentsClientHttpRequestFactory(client);
}

The value of 50000 is only a academic value.

I'm using my RestTemplate withhin a Hystrix wrapped Service Connector:

@HystrixCommand(commandProperties = { @HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE") }, fallbackMethod = "fallbackActivityCall")
public Optional<ResponseActivityValue> callForActivity() {
    final StringBuilder urlBuilder = new StringBuilder(accessConfig.getTracking().getUrl());
    final HttpEntity<String> entity = new HttpEntity<>(buildAuthHeader());

    final ResponseEntity<ResponseActivityValue> re = restTemplate.exchange(urlBuilder.toString(), HttpMethod.GET, entity, ResponseActivityValue.class);
    final HttpStatus code = re.getStatusCode();
    return Optional.ofNullable(re.getBody());
}

I tested it with the service to call stopped. Instead of the expected value of 50000, the method returns after 3 seconds. It doesn't matter which value i configure in te RestTemplate, it always returns after 3 seconds.

Does anyone have an idea?

Answer 1

You can use directly RestTemplateBuilder builder to build you rest Template instance : as below

@Bean
public RestTemplate rest(final RestTemplateBuilder builder) {
    return builder
             .setConnectTimeout(50000)
             .setReadTimeout(50000)
             .build()
}

And try setting configuration for hysterix in application.properties

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=50000

or just in your the command directly (@HystrixProperty)

@HystrixCommand(
  commandProperties = { 
    @HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE"), 
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "50000")  
}, fallbackMethod = "fallbackActivityCall")
public Optional<ResponseActivityValue> callForActivity() {
 ....
}