Spring Retry is a powerful framework in the Spring ecosystem that helps you handle retries in your applications. It allows you to define retryable methods and specify how many times they should be retried before giving up. Additionally, you can specify a method to be called when all retry attempts fail using the @Recover annotation.
Here’s an example of how to use @Recover with Spring Retry:
- First, make sure you have Spring Retry added to your project’s dependencies. You can do this by including the following dependency in your
pom.xml(for Maven) orbuild.gradle(for Gradle) file:
<!-- Maven -->
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>1.3.1</version> <!-- Use the latest version -->
</dependency>
- Create a service class with a method that you want to make retryable. Here’s an example:
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Recover;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
@Service
public class MyService {
private int retryCounter = 0;
@Retryable(value = { RuntimeException.class }, maxAttempts = 3, backoff = @Backoff(delay = 1000))
public void retryableMethod() {
retryCounter++;
System.out.println("Attempt " + retryCounter);
throw new RuntimeException("Simulated exception");
}
@Recover
public void recover(RuntimeException e) {
System.out.println("All retry attempts failed. Recover method called.");
}
}
In this example:
retryableMethod()is marked with@Retryable, which indicates that it should be retried when aRuntimeExceptionoccurs. It will be retried a maximum of 3 times with a delay of 1000 milliseconds (1 second) between each retry.recover()is marked with@Recoverand specifies that it should be called when all retry attempts fail. It takes an argument of the same type as the exception that triggered the retries (in this case,RuntimeException).
- Now, you can use
MyServicein your application to call the retryable method:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(Application.class, args);
MyService myService = context.getBean(MyService.class);
try {
myService.retryableMethod();
} catch (RuntimeException e) {
System.out.println("Caught exception: " + e.getMessage());
}
}
}
When you run this application, you’ll see the retryableMethod() being retried up to three times with a 1-second delay between attempts. If all retry attempts fail, the recover() method will be called, and you’ll see the “All retry attempts failed. Recover method called.” message in the output.
224vinod Tech 
Leave a comment