How to ensure that the listener of @Retryable annotation is called only when specified?

Accurate configuration of @Retryable annotation listener in Spring Retry

The Spring Retry framework provides @Retryable annotation to facilitate the implementation of method retry. To control and monitor the retry process more granularly, we can use a custom listener. This article explores how to properly configure the listener of the @Retryable annotation so that it is called only when explicitly specified.

Problem: The listener is still called without specifying

We expect the custom retry listener MyRetryListener to take effect only if explicitly specified in the @Retryable annotation. However, even if the listener is not declared in the annotation, MyRetryListener will still be called.

Existing code:

 // Use @Retryable(listeners = {"myRetryListener"}, value = Exception.class)

// Configuration class @Configuration
public class ListenerConfig {

    @Bean
    public MyRetryListener myRetryListener() {
        return new MyRetryListener();
    }
}

Target: MyRetryListener is called only if @Retryable(listeners = {"myRetryListener"}, ...) is explicitly specified.

Solution: Make sure the listener is called on demand

To solve this problem, the following aspects need to be carefully examined:

1. Listener implementation: Confirm that MyRetryListener correctly implements the RetryListener interface and includes necessary methods such as open , close , onError , etc.

2. Annotation configuration: listeners attribute in @Retryable annotation must exactly match the name of the Bean. Pay attention to upper and lower case. If the Bean name is myRetryListener , it must also be written as listeners = {"myRetryListener"} in the annotation.

3. Spring configuration: Make sure that the bean name defined by @Bean annotation in ListenerConfig class is myRetryListener (or exactly the same as the name specified in @Retryable ).

4. Avoid global listeners: Avoid registering a global RetryListener in Spring configuration, which causes all retry operations to call the listener. Global listeners should be used with caution.

5. Test verification: Write unit tests to verify that MyRetryListener is called only when explicitly specifying listeners attribute in the @Retryable annotation. In the test, try to specify and not specify the listener separately to observe its behavior.

Through the above steps, we can ensure that MyRetryListener is only called when explicitly specified by @Retryable annotation, thereby achieving accurate retry listening. This helps improve the maintainability and readability of the code, avoiding performance losses or logical errors caused by unnecessary listener calls.

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