Handling Retry with Spring-Retry

 Suppose you have a method for which you want to retry at a specific interval if any exception occurs.

Below are the steps using Spring Retry:

Add below maven dependenciess:

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-aop</artifactId>

<version>3.0.5.RELEASE</version>

</dependency>

<dependency>

<groupId>org.aspectj</groupId>

<artifactId>aspectjweaver</artifactId>

<version>1.6.11</version>

</dependency>

<dependency>

<groupId>org.springframework.retry</groupId>

<artifactId>spring-retry</artifactId>

<version>1.1.2.RELEASE</version>

</dependency>

Steps for call:

                SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();

retryPolicy.setMaxAttempts(5); //Max retry # 

FixedBackOffPolicy backOffPolicy = new FixedBackOffPolicy();

backOffPolicy.setBackOffPeriod(1500); // Retry @ every1.5 seconds

RetryTemplate template = new RetryTemplate();

template.setRetryPolicy(retryPolicy);

template.setBackOffPolicy(backOffPolicy);

return template.execute(new RetryCallback<String, Exception>() {

public String doWithRetry(RetryContext context) throws Exception {

                            // Asumption method m1 is sending String as return type

 String outputStr =m1();

return outputStr;

}

});

RetryCallback should be defined with <[ReturnType Of Method],[Exception to be Retried]>.

Here in case, I have assumed the called method is returning String & retry in case of an instance of Exception is thrown.

Below are the classes need to import:

import org.springframework.retry.RetryCallback;

import org.springframework.retry.RetryContext;

import org.springframework.retry.backoff.FixedBackOffPolicy;

import org.springframework.retry.policy.SimpleRetryPolicy;

import org.springframework.retry.support.RetryTemplate;