Retry java RestTemplate HTTP request if host offline

Question

Hi I\'m using the spring RestTemplate for calling a REST API. The API can be very slow or even offline. My application is building the cache by sending thousand

Answer 1

You can also tackle this annotation-driven using Spring Retry. This way you will avoid to implement the template.

Add it to your pom.xml

    org.springframework.retry
    spring-retry
    1.1.2.RELEASE

Enable it for your application/configuration

@SpringBootApplication
@EnableRetry
public class MyApplication {
  //...
}

Guard methods that are in danger of failure with @Retryable

@Service
public class MyService {

  @Retryable(maxAttempts=5, value = RuntimeException.class, 
             backoff = @Backoff(delay = 15000, multiplier = 2))
  public List doDangerousOperationWithExternalResource() {
     // ...
  }

}